diff --git a/contrib/test/craft/CMakeLists.txt b/contrib/test/craft/CMakeLists.txt
index e0f6ae64bd..d4d5a6365f 100644
--- a/contrib/test/craft/CMakeLists.txt
+++ b/contrib/test/craft/CMakeLists.txt
@@ -1,2 +1,2 @@
 add_executable(simulate_vnode "simulate_vnode.c")
-target_link_libraries(simulate_vnode PUBLIC craft lz4 uv_a)
\ No newline at end of file
+target_link_libraries(simulate_vnode craft lz4 uv_a)
\ No newline at end of file
diff --git a/contrib/test/traft/single_node/CMakeLists.txt b/contrib/test/traft/single_node/CMakeLists.txt
index 666ce271b8..84b65978b9 100644
--- a/contrib/test/traft/single_node/CMakeLists.txt
+++ b/contrib/test/traft/single_node/CMakeLists.txt
@@ -3,4 +3,4 @@ target_sources(singleNode
   PRIVATE
   "singleNode.c" 
 )
-target_link_libraries(singleNode PUBLIC traft lz4 uv_a)
+target_link_libraries(singleNode traft lz4 uv_a)
diff --git a/example/CMakeLists.txt b/example/CMakeLists.txt
index 71a9f9f4c5..51e1e996dc 100644
--- a/example/CMakeLists.txt
+++ b/example/CMakeLists.txt
@@ -2,11 +2,7 @@ aux_source_directory(src TMQ_DEMO_SRC)
 
 add_executable(tmq ${TMQ_DEMO_SRC})
 target_link_libraries(
-    tmq
-    PUBLIC taos
-    #PUBLIC util
-    #PUBLIC common
-    #PUBLIC os
+    tmq taos
 )
 target_include_directories(
     tmq
diff --git a/include/common/taosdef.h b/include/common/taosdef.h
index 66cb0bb4ba..69c2618ac8 100644
--- a/include/common/taosdef.h
+++ b/include/common/taosdef.h
@@ -51,6 +51,10 @@ typedef enum {
 } ECheckItemType;
 
 typedef enum { TD_ROW_DISCARD_UPDATE = 0, TD_ROW_OVERWRITE_UPDATE = 1, TD_ROW_PARTIAL_UPDATE = 2 } TDUpdateConfig;
+typedef enum {
+  TSDB_STATIS_OK = 0,    // statis part exist and load successfully
+  TSDB_STATIS_NONE = 1,  // statis part not exist
+} ETsdbStatisStatus;
 
 extern char *qtypeStr[];
 
diff --git a/include/common/tglobal.h b/include/common/tglobal.h
index e09f6d11bd..2261170e63 100644
--- a/include/common/tglobal.h
+++ b/include/common/tglobal.h
@@ -52,6 +52,13 @@ extern bool    tsEnableSlaveQuery;
 extern bool    tsPrintAuth;
 extern int64_t tsTickPerDay[3];
 
+// monitor
+extern bool     tsEnableMonitor;
+extern int32_t  tsMonitorInterval;
+extern char     tsMonitorFqdn[];
+extern uint16_t tsMonitorPort;
+extern int32_t  tsMonitorMaxLogs;
+
 // query buffer management
 extern int32_t tsQueryBufferSize;  // maximum allowed usage buffer size in MB for each data node during query processing
 extern int64_t tsQueryBufferSizeBytes;   // maximum allowed usage buffer size in byte for each data node
diff --git a/include/common/ttime.h b/include/common/ttime.h
index a4b2aa6673..b71426e312 100644
--- a/include/common/ttime.h
+++ b/include/common/ttime.h
@@ -52,6 +52,8 @@ void    deltaToUtcInitOnce();
 
 int64_t convertTimePrecision(int64_t time, int32_t fromPrecision, int32_t toPrecision);
 
+void taosFormatUtcTime(char *buf, int32_t bufLen, int64_t time, int32_t precision);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/dnode/mnode/mnode.h b/include/dnode/mnode/mnode.h
index 2680bb83ed..d295e772e8 100644
--- a/include/dnode/mnode/mnode.h
+++ b/include/dnode/mnode/mnode.h
@@ -16,6 +16,8 @@
 #ifndef _TD_MND_H_
 #define _TD_MND_H_
 
+#include "monitor.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -30,20 +32,6 @@ typedef int32_t (*PutReqToMWriteQFp)(SDnode *pDnode, struct SRpcMsg *rpcMsg);
 typedef int32_t (*PutReqToMReadQFp)(SDnode *pDnode, struct SRpcMsg *rpcMsg);
 typedef void (*SendRedirectRspFp)(SDnode *pDnode, struct SRpcMsg *rpcMsg);
 
-typedef struct SMnodeLoad {
-  int64_t numOfDnode;
-  int64_t numOfMnode;
-  int64_t numOfVgroup;
-  int64_t numOfDatabase;
-  int64_t numOfSuperTable;
-  int64_t numOfChildTable;
-  int64_t numOfNormalTable;
-  int64_t numOfColumn;
-  int64_t totalPoints;
-  int64_t totalStorage;
-  int64_t compStorage;
-} SMnodeLoad;
-
 typedef struct {
   int32_t           dnodeId;
   int64_t           clusterId;
@@ -92,13 +80,16 @@ int32_t mndAlter(SMnode *pMnode, const SMnodeOpt *pOption);
 void mndDestroy(const char *path);
 
 /**
- * @brief Get mnode statistics info.
+ * @brief Get mnode monitor info.
  *
  * @param pMnode The mnode object.
- * @param pLoad Statistics of the mnode.
+ * @param pClusterInfo
+ * @param pVgroupInfo
+ * @param pGrantInfo
  * @return int32_t 0 for success, -1 for failure.
  */
-int32_t mndGetLoad(SMnode *pMnode, SMnodeLoad *pLoad);
+int32_t mndGetMonitorInfo(SMnode *pMnode, SMonClusterInfo *pClusterInfo, SMonVgroupInfo *pVgroupInfo,
+                          SMonGrantInfo *pGrantInfo);
 
 /**
  * @brief Get user authentication info.
diff --git a/include/libs/monitor/monitor.h b/include/libs/monitor/monitor.h
new file mode 100644
index 0000000000..4b7c6a9bc9
--- /dev/null
+++ b/include/libs/monitor/monitor.h
@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TD_MONITOR_H_
+#define _TD_MONITOR_H_
+
+#include "tarray.h"
+#include "tdef.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+  int32_t dnode_id;
+  char    dnode_ep[TSDB_EP_LEN];
+} SMonBasicInfo;
+
+typedef struct {
+  int32_t dnode_id;
+  char    dnode_ep[TSDB_EP_LEN];
+  char    status[8];
+} SMonDnodeDesc;
+
+typedef struct {
+  int32_t mnode_id;
+  char    mnode_ep[TSDB_EP_LEN];
+  char    role[8];
+} SMonMnodeDesc;
+
+typedef struct {
+  char    first_ep[TSDB_EP_LEN];
+  int32_t first_ep_dnode_id;
+  char    version[12];
+  float   master_uptime;     // day
+  int32_t monitor_interval;  // sec
+  int32_t vgroups_total;
+  int32_t vgroups_alive;
+  int32_t vnodes_total;
+  int32_t vnodes_alive;
+  int32_t connections_total;
+  SArray *dnodes;  // array of SMonDnodeDesc
+  SArray *mnodes;  // array of SMonMnodeDesc
+} SMonClusterInfo;
+
+typedef struct {
+  int32_t dnode_id;
+  int8_t  vnode_online;
+  char    vnode_role[8];
+} SMonVnodeDesc;
+
+typedef struct {
+  int32_t       vgroup_id;
+  SMonVnodeDesc vnodes[TSDB_MAX_REPLICA];
+} SMonVgroupDesc;
+
+typedef struct {
+  char    database_name[TSDB_DB_NAME_LEN];
+  int32_t tables_num;
+  int8_t  status;
+  SArray *vgroups;  // array of SMonVgroupDesc
+} SMonVgroupInfo;
+
+typedef struct {
+  int32_t expire_time;
+  int32_t timeseries_used;
+  int32_t timeseries_total;
+} SMonGrantInfo;
+
+typedef struct {
+  float   uptime;  // day
+  float   cpu_engine;
+  float   cpu_system;
+  float   cpu_cores;
+  float   mem_engine;     // MB
+  float   mem_system;     // MB
+  float   mem_total;      // MB
+  float   disk_engine;    // GB
+  float   disk_used;      // GB
+  float   disk_total;     // GB
+  float   net_in;         // Kb/s
+  float   net_out;        // Kb/s
+  float   io_read;        // Mb/s
+  float   io_write;       // Mb/s
+  float   io_read_disk;   // Mb/s
+  float   io_write_disk;  // Mb/s
+  int32_t req_select;
+  float   req_select_rate;
+  int32_t req_insert;
+  int32_t req_insert_success;
+  float   req_insert_rate;
+  int32_t req_insert_batch;
+  int32_t req_insert_batch_success;
+  float   req_insert_batch_rate;
+  int32_t errors;
+  int32_t vnodes_num;
+  int32_t masters;
+  int32_t has_mnode;
+} SMonDnodeInfo;
+
+typedef struct {
+  char      name[TSDB_FILENAME_LEN];
+  int32_t   level;
+  SDiskSize size;
+} SMonDiskDesc;
+
+typedef struct {
+  SArray *disks;  // array of SMonDiskDesc
+} SMonDiskInfo;
+
+typedef struct {
+  int64_t ts;
+  int8_t  level;
+  char    content[1024];
+} SMonLogItem;
+
+typedef struct SMonInfo SMonInfo;
+
+typedef struct {
+  const char *server;
+  uint16_t    port;
+  int32_t     maxLogs;
+} SMonCfg;
+
+int32_t monInit(const SMonCfg *pCfg);
+void    monCleanup();
+void    monAddLogItem(SMonLogItem *pItem);
+
+SMonInfo *monCreateMonitorInfo();
+void      monSetBasicInfo(SMonInfo *pMonitor, SMonBasicInfo *pInfo);
+void      monSetClusterInfo(SMonInfo *pMonitor, SMonClusterInfo *pInfo);
+void      monSetVgroupInfo(SMonInfo *pMonitor, SMonVgroupInfo *pInfo);
+void      monSetGrantInfo(SMonInfo *pMonitor, SMonGrantInfo *pInfo);
+void      monSetDnodeInfo(SMonInfo *pMonitor, SMonDnodeInfo *pInfo);
+void      monSetDiskInfo(SMonInfo *pMonitor, SMonDiskInfo *pInfo);
+void      monSendReport(SMonInfo *pMonitor);
+void      monCleanupMonitorInfo(SMonInfo *pMonitor);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_MONITOR_H_*/
diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index a619e66622..cd04783dbc 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -34,7 +34,9 @@ typedef enum {
   TAOS_SYNC_STATE_FOLLOWER = 0,
   TAOS_SYNC_STATE_CANDIDATE = 1,
   TAOS_SYNC_STATE_LEADER = 2,
-} ESyncState;
+} ESyncRole;
+
+typedef ESyncRole ESyncState;
 
 typedef struct SSyncBuffer {
   void*  data;
@@ -69,15 +71,15 @@ typedef struct SSyncFSM {
 
   // when value in pBuf finish a raft flow, FpCommitCb is called, code indicates the result
   // user can do something according to the code and isWeak. for example, write data into tsdb
-  void (*FpCommitCb)(struct SSyncFSM* pFsm, const SSyncBuffer* pBuf, SyncIndex index, bool isWeak, int32_t code);
+  void (*FpCommitCb)(struct SSyncFSM* pFsm, const SRpcMsg* pBuf, SyncIndex index, bool isWeak, int32_t code);
 
   // when value in pBuf has been written into local log store, FpPreCommitCb is called, code indicates the result
   // user can do something according to the code and isWeak. for example, write data into tsdb
-  void (*FpPreCommitCb)(struct SSyncFSM* pFsm, const SSyncBuffer* pBuf, SyncIndex index, bool isWeak, int32_t code);
+  void (*FpPreCommitCb)(struct SSyncFSM* pFsm, const SRpcMsg* pBuf, SyncIndex index, bool isWeak, int32_t code);
 
   // when log entry is updated by a new one, FpRollBackCb is called
   // user can do something to roll back. for example, delete data from tsdb, or just ignore it
-  void (*FpRollBackCb)(struct SSyncFSM* pFsm, const SSyncBuffer* pBuf, SyncIndex index, bool isWeak, int32_t code);
+  void (*FpRollBackCb)(struct SSyncFSM* pFsm, const SRpcMsg* pBuf, SyncIndex index, bool isWeak, int32_t code);
 
   // user should implement this function, use "data" to take snapshot into "snapshot"
   int32_t (*FpTakeSnapshot)(SSnapshot* snapshot);
@@ -93,10 +95,10 @@ typedef struct SSyncLogStore {
   void* data;
 
   // append one log entry
-  int32_t (*appendEntry)(struct SSyncLogStore* pLogStore, SSyncBuffer* pBuf);
+  int32_t (*appendEntry)(struct SSyncLogStore* pLogStore, SRpcMsg* pBuf);
 
   // get one log entry, user need to free pBuf->data
-  int32_t (*getEntry)(struct SSyncLogStore* pLogStore, SyncIndex index, SSyncBuffer* pBuf);
+  int32_t (*getEntry)(struct SSyncLogStore* pLogStore, SyncIndex index, SRpcMsg* pBuf);
 
   // update log store commit index with "index"
   int32_t (*updateCommitIndex)(struct SSyncLogStore* pLogStore, SyncIndex index);
@@ -135,7 +137,9 @@ typedef struct SSyncInfo {
   SSyncCfg    syncCfg;
   char        path[TSDB_FILENAME_LEN];
   SSyncFSM*   pFsm;
-  int32_t (*FpSendMsg)(void* handle, const SEpSet* pEpSet, SRpcMsg* pMsg);
+
+  void* rpcClient;
+  int32_t (*FpSendMsg)(void* rpcClient, const SEpSet* pEpSet, SRpcMsg* pMsg);
 
 } SSyncInfo;
 
@@ -149,8 +153,8 @@ int64_t syncStart(const SSyncInfo* pSyncInfo);
 void    syncStop(int64_t rid);
 int32_t syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg);
 
-// int32_t syncForwardToPeer(int64_t rid, const SRpcMsg* pBuf, bool isWeak);
-int32_t syncForwardToPeer(int64_t rid, const SSyncBuffer* pBuf, bool isWeak);
+int32_t syncForwardToPeer(int64_t rid, const SRpcMsg* pBuf, bool isWeak);
+// int32_t syncForwardToPeer(int64_t rid, const SSyncBuffer* pBuf, bool isWeak);
 
 ESyncState syncGetMyRole(int64_t rid);
 void       syncGetNodesRole(int64_t rid, SNodesRole* pNodeRole);
diff --git a/include/os/osSysinfo.h b/include/os/osSysinfo.h
index 35ac032a8a..bf9d7662e6 100644
--- a/include/os/osSysinfo.h
+++ b/include/os/osSysinfo.h
@@ -42,7 +42,6 @@ bool    taosGetCpuUsage(float *sysCpuUsage, float *procCpuUsage);
 bool    taosGetTotalSysMemoryKB(uint64_t *kb);
 bool    taosGetProcMemory(float *memoryUsedMB);  //
 bool    taosGetSysMemory(float *memoryUsedMB);   //
-void    taosGetDisk();
 int32_t taosGetDiskSize(char *dataDir, SDiskSize *diskSize);
 bool    taosReadProcIO(int64_t *rchars, int64_t *wchars);
 bool    taosGetProcIO(float *readKB, float *writeKB);
diff --git a/source/common/CMakeLists.txt b/source/common/CMakeLists.txt
index 04e5a36e86..1e4ad95504 100644
--- a/source/common/CMakeLists.txt
+++ b/source/common/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src COMMON_SRC)
-add_library(common ${COMMON_SRC})
+add_library(common STATIC ${COMMON_SRC})
 target_include_directories(
     common
     PUBLIC "${CMAKE_SOURCE_DIR}/include/common"
diff --git a/source/common/src/tglobal.c b/source/common/src/tglobal.c
index d66895888b..5998b7c9ce 100644
--- a/source/common/src/tglobal.c
+++ b/source/common/src/tglobal.c
@@ -46,6 +46,13 @@ int32_t tsMaxBinaryDisplayWidth = 30;
 bool    tsEnableSlaveQuery = 1;
 bool    tsPrintAuth = 0;
 
+// monitor
+bool     tsEnableMonitor = 1;
+int32_t  tsMonitorInterval = 5;
+char     tsMonitorFqdn[TSDB_FQDN_LEN] = {0};
+uint16_t tsMonitorPort = 6043;
+int32_t  tsMonitorMaxLogs = 100;
+
 /*
  * denote if the server needs to compress response message at the application layer to client, including query rsp,
  * metricmeta rsp, and multi-meter query rsp message body. The client compress the submit message to server.
@@ -314,6 +321,13 @@ static int32_t taosAddServerCfg(SConfig *pCfg) {
   if (cfgAddBool(pCfg, "printAuth", tsPrintAuth, 0) != 0) return -1;
   if (cfgAddBool(pCfg, "slaveQuery", tsEnableSlaveQuery, 0) != 0) return -1;
   if (cfgAddBool(pCfg, "deadLockKillQuery", tsDeadLockKillQuery, 0) != 0) return -1;
+
+  if (cfgAddBool(pCfg, "monitor", tsEnableMonitor, 0) != 0) return -1;
+  if (cfgAddInt32(pCfg, "monitorInterval", tsMonitorInterval, 1, 360000, 0) != 0) return -1;
+  if (cfgAddString(pCfg, "monitorFqdn", tsMonitorFqdn, 0) != 0) return -1;
+  if (cfgAddInt32(pCfg, "monitorPort", tsMonitorPort, 1, 65056, 0) != 0) return -1;
+  if (cfgAddInt32(pCfg, "monitorMaxLogs", tsMonitorMaxLogs, 1, 1000000, 0) != 0) return -1;
+
   return 0;
 }
 
@@ -345,7 +359,7 @@ static void taosSetServerLogCfg(SConfig *pCfg) {
 }
 
 static void taosSetClientCfg(SConfig *pCfg) {
-  tstrncpy(tsLocalFqdn, cfgGetItem(pCfg, "fqdn")->str, TSDB_EP_LEN);
+  tstrncpy(tsLocalFqdn, cfgGetItem(pCfg, "fqdn")->str, TSDB_FQDN_LEN);
   tsServerPort = (uint16_t)cfgGetItem(pCfg, "serverPort")->i32;
   snprintf(tsLocalEp, sizeof(tsLocalEp), "%s:%u", tsLocalFqdn, tsServerPort);
 
@@ -425,6 +439,12 @@ static void taosSetServerCfg(SConfig *pCfg) {
   tsEnableSlaveQuery = cfgGetItem(pCfg, "slaveQuery")->bval;
   tsDeadLockKillQuery = cfgGetItem(pCfg, "deadLockKillQuery")->bval;
 
+  tsEnableMonitor = cfgGetItem(pCfg, "monitor")->bval;
+  tsMonitorInterval = cfgGetItem(pCfg, "monitorInterval")->i32;
+  tstrncpy(tsMonitorFqdn, cfgGetItem(pCfg, "monitorFqdn")->str, TSDB_FQDN_LEN);
+  tsMonitorPort = (uint16_t)cfgGetItem(pCfg, "monitorPort")->i32;
+  tsMonitorMaxLogs = cfgGetItem(pCfg, "monitorMaxLogs")->i32;
+
   if (tsQueryBufferSize >= 0) {
     tsQueryBufferSizeBytes = tsQueryBufferSize * 1048576UL;
   }
diff --git a/source/common/src/tname.c b/source/common/src/tname.c
index e061862856..fb77417cac 100644
--- a/source/common/src/tname.c
+++ b/source/common/src/tname.c
@@ -22,6 +22,7 @@ bool tscValidateTableNameLength(size_t len) {
   return len < TSDB_TABLE_NAME_LEN;
 }
 
+#if 0
 // TODO refactor
 SColumnFilterInfo* tFilterInfoDup(const SColumnFilterInfo* src, int32_t numOfFilters) {
   if (numOfFilters == 0 || src == NULL) {
@@ -46,7 +47,7 @@ SColumnFilterInfo* tFilterInfoDup(const SColumnFilterInfo* src, int32_t numOfFil
 
   return pFilter;
 }
-
+#endif
 #if 0
 int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, int64_t intervalTime, char timeUnit, int16_t precision) {
   if (slidingTime == 0) {
diff --git a/source/common/src/ttime.c b/source/common/src/ttime.c
index 460c4a6fc0..7a318c2eb8 100644
--- a/source/common/src/ttime.c
+++ b/source/common/src/ttime.c
@@ -627,3 +627,50 @@ const char* fmtts(int64_t ts) {
 
   return buf;
 }
+
+void taosFormatUtcTime(char* buf, int32_t bufLen, int64_t t, int32_t precision) {
+  char       ts[40] = {0};
+  struct tm* ptm;
+
+  int32_t fractionLen;
+  char*   format = NULL;
+  time_t  quot = 0;
+  long    mod = 0;
+
+  switch (precision) {
+    case TSDB_TIME_PRECISION_MILLI: {
+      quot = t / 1000;
+      fractionLen = 5;
+      format = ".%03" PRId64;
+      mod = t % 1000;
+      break;
+    }
+
+    case TSDB_TIME_PRECISION_MICRO: {
+      quot = t / 1000000;
+      fractionLen = 8;
+      format = ".%06" PRId64;
+      mod = t % 1000000;
+      break;
+    }
+
+    case TSDB_TIME_PRECISION_NANO: {
+      quot = t / 1000000000;
+      fractionLen = 11;
+      format = ".%09" PRId64;
+      mod = t % 1000000000;
+      break;
+    }
+
+    default:
+      fractionLen = 0;
+      assert(false);
+  }
+
+  ptm = localtime(&quot);
+  int32_t length = (int32_t)strftime(ts, 40, "%Y-%m-%dT%H:%M:%S", ptm);
+  length += snprintf(ts + length, fractionLen, format, mod);
+  length += (int32_t)strftime(ts + length, 40 - length, "%z", ptm);
+
+  tstrncpy(buf, ts, bufLen);
+}
\ No newline at end of file
diff --git a/source/dnode/bnode/CMakeLists.txt b/source/dnode/bnode/CMakeLists.txt
index a284437450..f51969f6bf 100644
--- a/source/dnode/bnode/CMakeLists.txt
+++ b/source/dnode/bnode/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src BNODE_SRC)
-add_library(bnode ${BNODE_SRC})
+add_library(bnode STATIC ${BNODE_SRC})
 target_include_directories(
     bnode
     PUBLIC "${CMAKE_SOURCE_DIR}/include/dnode/bnode"
diff --git a/source/dnode/mgmt/daemon/CMakeLists.txt b/source/dnode/mgmt/daemon/CMakeLists.txt
index e07c15c95a..3238bbf3f0 100644
--- a/source/dnode/mgmt/daemon/CMakeLists.txt
+++ b/source/dnode/mgmt/daemon/CMakeLists.txt
@@ -6,4 +6,4 @@ target_include_directories(
     PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
 )
 
-target_link_libraries(taosd dnode util os)
+target_link_libraries(taosd dnode)
diff --git a/source/dnode/mgmt/impl/CMakeLists.txt b/source/dnode/mgmt/impl/CMakeLists.txt
index 171f9649fb..c99a405527 100644
--- a/source/dnode/mgmt/impl/CMakeLists.txt
+++ b/source/dnode/mgmt/impl/CMakeLists.txt
@@ -1,17 +1,7 @@
 aux_source_directory(src DNODE_SRC)
 add_library(dnode STATIC ${DNODE_SRC})
 target_link_libraries(
-    dnode
-    PUBLIC cjson
-    PUBLIC mnode
-    PUBLIC vnode
-    PUBLIC qnode
-    PUBLIC snode
-    PUBLIC bnode
-    PUBLIC wal
-    PUBLIC sync
-    PUBLIC taos
-    PUBLIC tfs
+    dnode cjson mnode vnode qnode snode bnode wal sync taos tfs monitor
 )
 target_include_directories(
     dnode
diff --git a/source/dnode/mgmt/impl/inc/dndInt.h b/source/dnode/mgmt/impl/inc/dndInt.h
index 417bc1e041..9fabe40186 100644
--- a/source/dnode/mgmt/impl/inc/dndInt.h
+++ b/source/dnode/mgmt/impl/inc/dndInt.h
@@ -36,6 +36,7 @@ extern "C" {
 #include "ttime.h"
 #include "tworker.h"
 #include "tglobal.h"
+#include "monitor.h"
 
 #include "dnode.h"
 
diff --git a/source/dnode/mgmt/impl/inc/dndMnode.h b/source/dnode/mgmt/impl/inc/dndMnode.h
index dafbae10ad..0f03bb3832 100644
--- a/source/dnode/mgmt/impl/inc/dndMnode.h
+++ b/source/dnode/mgmt/impl/inc/dndMnode.h
@@ -32,6 +32,9 @@ int32_t dndProcessCreateMnodeReq(SDnode *pDnode, SRpcMsg *pRpcMsg);
 int32_t dndProcessAlterMnodeReq(SDnode *pDnode, SRpcMsg *pRpcMsg);
 int32_t dndProcessDropMnodeReq(SDnode *pDnode, SRpcMsg *pRpcMsg);
 
+int32_t dndGetMnodeMonitorInfo(SDnode *pDnode, SMonClusterInfo *pClusterInfo, SMonVgroupInfo *pVgroupInfo,
+                               SMonGrantInfo *pGrantInfo);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/dnode/mgmt/impl/src/dndEnv.c b/source/dnode/mgmt/impl/src/dndEnv.c
index 9467b56e6b..2539443b41 100644
--- a/source/dnode/mgmt/impl/src/dndEnv.c
+++ b/source/dnode/mgmt/impl/src/dndEnv.c
@@ -21,6 +21,7 @@
 #include "dndSnode.h"
 #include "dndTransport.h"
 #include "dndVnodes.h"
+#include "monitor.h"
 #include "sync.h"
 #include "tfs.h"
 #include "wal.h"
@@ -140,7 +141,7 @@ static int32_t dndInitDir(SDnode *pDnode, SDnodeObjCfg *pCfg) {
   return 0;
 }
 
-static void dndCloseImp(SDnode *pDnode) {
+static void dndCloseDir(SDnode *pDnode) {
   tfree(pDnode->dir.mnode);
   tfree(pDnode->dir.vnodes);
   tfree(pDnode->dir.dnode);
@@ -260,7 +261,7 @@ void dndClose(SDnode *pDnode) {
   dndCleanupMgmt(pDnode);
   tfsClose(pDnode->pTfs);
 
-  dndCloseImp(pDnode);
+  dndCloseDir(pDnode);
   free(pDnode);
   dInfo("dnode object is closed, data:%p", pDnode);
 }
@@ -289,11 +290,7 @@ int32_t dndInit() {
   }
 
   SVnodeOpt vnodeOpt = {
-      .sver = tsVersion,
-      .nthreads = tsNumOfCommitThreads,
-      .putReqToVQueryQFp = dndPutReqToVQueryQ,
-      .sendReqToDnodeFp = dndSendReqToDnode
-  };
+      .nthreads = tsNumOfCommitThreads, .putReqToVQueryQFp = dndPutReqToVQueryQ, .sendReqToDnodeFp = dndSendReqToDnode};
 
   if (vnodeInit(&vnodeOpt) != 0) {
     dError("failed to init vnode since %s", terrstr());
@@ -301,6 +298,13 @@ int32_t dndInit() {
     return -1;
   }
 
+  SMonCfg monCfg = {.maxLogs = tsMonitorMaxLogs, .port = tsMonitorPort, .server = tsMonitorFqdn};
+  if (monInit(&monCfg) != 0) {
+    dError("failed to init monitor since %s", terrstr());
+    dndCleanup();
+    return -1;
+  }
+
   dInfo("dnode env is initialized");
   return 0;
 }
@@ -314,19 +318,8 @@ void dndCleanup() {
   walCleanUp();
   vnodeCleanup();
   rpcCleanup();
+  monCleanup();
 
   taosStopCacheRefreshWorker();
   dInfo("dnode env is cleaned up");
 }
-
-// OTHER FUNCTIONS ===================================
-void taosGetDisk() {
-#if 0  
-  const double unit = 1024 * 1024 * 1024;
-  
-  SDiskSize    diskSize = tfsGetSize(pTfs);
-  
-  tfsUpdateSize(&fsMeta);
-
-#endif
-}
\ No newline at end of file
diff --git a/source/dnode/mgmt/impl/src/dndMgmt.c b/source/dnode/mgmt/impl/src/dndMgmt.c
index 8f18222ab6..4bf8b82043 100644
--- a/source/dnode/mgmt/impl/src/dndMgmt.c
+++ b/source/dnode/mgmt/impl/src/dndMgmt.c
@@ -22,6 +22,7 @@
 #include "dndTransport.h"
 #include "dndVnodes.h"
 #include "dndWorker.h"
+#include "monitor.h"
 
 static void dndProcessMgmtQueue(SDnode *pDnode, SRpcMsg *pMsg);
 
@@ -473,19 +474,62 @@ void dndProcessStartupReq(SDnode *pDnode, SRpcMsg *pReq) {
   rpcSendResponse(&rpcRsp);
 }
 
+void dndGetBasicInfo(SDnode *pDnode, SMonBasicInfo *pInfo) {
+  pInfo->dnode_id = dndGetDnodeId(pDnode);
+  tstrncpy(pInfo->dnode_ep, tsLocalEp, TSDB_EP_LEN);
+}
+
+static void dndSendMonitorReport(SDnode *pDnode) {
+  if (!tsEnableMonitor || tsMonitorFqdn[0] == 0) return;
+  SMonInfo *pMonitor = monCreateMonitorInfo();
+  if (pMonitor == NULL) return;
+
+  dTrace("pDnode:%p, send monitor report to %s:%u", pDnode, tsMonitorFqdn, tsMonitorPort);
+
+  SMonBasicInfo basicInfo = {0};
+  dndGetBasicInfo(pDnode, &basicInfo);
+  monSetBasicInfo(pMonitor, &basicInfo);
+
+  SMonClusterInfo clusterInfo = {0};
+  SMonVgroupInfo  vgroupInfo = {0};
+  SMonGrantInfo   grantInfo = {0};
+  if (dndGetMnodeMonitorInfo(pDnode, &clusterInfo, &vgroupInfo, &grantInfo) == 0) {
+    monSetClusterInfo(pMonitor, &clusterInfo);
+    monSetVgroupInfo(pMonitor, &vgroupInfo);
+    monSetGrantInfo(pMonitor, &grantInfo);
+  }
+
+  monSendReport(pMonitor);
+  monCleanupMonitorInfo(pMonitor);
+}
+
 static void *dnodeThreadRoutine(void *param) {
   SDnode     *pDnode = param;
   SDnodeMgmt *pMgmt = &pDnode->dmgmt;
-  int32_t     ms = tsStatusInterval * 1000;
+  int64_t     lastStatusTime = taosGetTimestampMs();
+  int64_t     lastMonitorTime = lastStatusTime;
 
   setThreadName("dnode-hb");
 
   while (true) {
     pthread_testcancel();
-    taosMsleep(ms);
+    taosMsleep(200);
+    if (dndGetStat(pDnode) != DND_STAT_RUNNING || pMgmt->dropped) {
+      continue;
+    }
 
-    if (dndGetStat(pDnode) == DND_STAT_RUNNING && !pMgmt->statusSent && !pMgmt->dropped) {
+    int64_t curTime = taosGetTimestampMs();
+
+    float statusInterval = (curTime - lastStatusTime) / 1000.0f;
+    if (statusInterval >= tsStatusInterval && !pMgmt->statusSent) {
       dndSendStatusReq(pDnode);
+      lastStatusTime = curTime;
+    }
+
+    float monitorInterval = (curTime - lastMonitorTime) / 1000.0f;
+    if (monitorInterval >= tsMonitorInterval) {
+      dndSendMonitorReport(pDnode);
+      lastMonitorTime = curTime;
     }
   }
 }
diff --git a/source/dnode/mgmt/impl/src/dndMnode.c b/source/dnode/mgmt/impl/src/dndMnode.c
index e1b16a188f..6cb117867f 100644
--- a/source/dnode/mgmt/impl/src/dndMnode.c
+++ b/source/dnode/mgmt/impl/src/dndMnode.c
@@ -630,3 +630,13 @@ int32_t dndGetUserAuthFromMnode(SDnode *pDnode, char *user, char *spi, char *enc
   dTrace("user:%s, retrieve auth spi:%d encrypt:%d", user, *spi, *encrypt);
   return code;
 }
+
+int32_t dndGetMnodeMonitorInfo(SDnode *pDnode, SMonClusterInfo *pClusterInfo, SMonVgroupInfo *pVgroupInfo,
+                               SMonGrantInfo *pGrantInfo) {
+  SMnode *pMnode = dndAcquireMnode(pDnode);
+  if (pMnode == NULL) return -1;
+
+  int32_t code = mndGetMonitorInfo(pMnode, pClusterInfo, pVgroupInfo, pGrantInfo);
+  dndReleaseMnode(pDnode, pMnode);
+  return code;
+}
\ No newline at end of file
diff --git a/source/dnode/mgmt/impl/test/sut/CMakeLists.txt b/source/dnode/mgmt/impl/test/sut/CMakeLists.txt
index d20c680fad..3a993986fe 100644
--- a/source/dnode/mgmt/impl/test/sut/CMakeLists.txt
+++ b/source/dnode/mgmt/impl/test/sut/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src SUT_SRC)
-add_library(sut STATIC ${SUT_SRC})
+add_library(sut STATIC STATIC ${SUT_SRC})
 target_link_libraries(
     sut
     PUBLIC dnode
diff --git a/source/dnode/mnode/impl/CMakeLists.txt b/source/dnode/mnode/impl/CMakeLists.txt
index 3aad002d40..514bba19f4 100644
--- a/source/dnode/mnode/impl/CMakeLists.txt
+++ b/source/dnode/mnode/impl/CMakeLists.txt
@@ -1,18 +1,12 @@
 aux_source_directory(src MNODE_SRC)
-add_library(mnode ${MNODE_SRC})
+add_library(mnode STATIC ${MNODE_SRC})
 target_include_directories(
     mnode
     PUBLIC "${CMAKE_SOURCE_DIR}/include/dnode/mnode"
     PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
 )
 target_link_libraries(
-    mnode
-    PRIVATE scheduler
-    PRIVATE sdb
-    PRIVATE wal
-    PRIVATE transport
-    PRIVATE cjson
-    PRIVATE sync
+    mnode scheduler sdb wal transport cjson sync monitor
 )
 
 if(${BUILD_TEST})
diff --git a/source/dnode/mnode/impl/inc/mndInt.h b/source/dnode/mnode/impl/inc/mndInt.h
index 54595fb105..929d47184b 100644
--- a/source/dnode/mnode/impl/inc/mndInt.h
+++ b/source/dnode/mnode/impl/inc/mndInt.h
@@ -21,11 +21,11 @@
 #include "sdb.h"
 #include "tcache.h"
 #include "tep.h"
+#include "tglobal.h"
 #include "tqueue.h"
 #include "ttime.h"
-#include "wal.h"
 #include "version.h"
-#include "tglobal.h"
+#include "wal.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -38,6 +38,20 @@ typedef int32_t (*ShowMetaFp)(SMnodeMsg *pMsg, SShowObj *pShow, STableMetaRsp *p
 typedef int32_t (*ShowRetrieveFp)(SMnodeMsg *pMsg, SShowObj *pShow, char *data, int32_t rows);
 typedef void (*ShowFreeIterFp)(SMnode *pMnode, void *pIter);
 
+typedef struct SMnodeLoad {
+  int64_t numOfDnode;
+  int64_t numOfMnode;
+  int64_t numOfVgroup;
+  int64_t numOfDatabase;
+  int64_t numOfSuperTable;
+  int64_t numOfChildTable;
+  int64_t numOfNormalTable;
+  int64_t numOfColumn;
+  int64_t totalPoints;
+  int64_t totalStorage;
+  int64_t compStorage;
+} SMnodeLoad;
+
 typedef struct {
   const char  *name;
   MndInitFp    initFp;
@@ -104,7 +118,9 @@ int32_t mndSendReqToMnode(SMnode *pMnode, SRpcMsg *pMsg);
 void    mndSendRedirectRsp(SMnode *pMnode, SRpcMsg *pMsg);
 void    mndSetMsgHandle(SMnode *pMnode, tmsg_t msgType, MndMsgFp fp);
 
-uint64_t mndGenerateUid(char *name, int32_t len) ;
+uint64_t mndGenerateUid(char *name, int32_t len);
+
+int32_t mndGetLoad(SMnode *pMnode, SMnodeLoad *pLoad);
 
 #ifdef __cplusplus
 }
diff --git a/source/dnode/mnode/impl/src/mnode.c b/source/dnode/mnode/impl/src/mnode.c
index 90d66a80fd..c95857a2d4 100644
--- a/source/dnode/mnode/impl/src/mnode.c
+++ b/source/dnode/mnode/impl/src/mnode.c
@@ -22,6 +22,7 @@
 #include "mndDb.h"
 #include "mndDnode.h"
 #include "mndFunc.h"
+#include "mndInfoSchema.h"
 #include "mndMnode.h"
 #include "mndOffset.h"
 #include "mndProfile.h"
@@ -36,7 +37,6 @@
 #include "mndTrans.h"
 #include "mndUser.h"
 #include "mndVgroup.h"
-#include "mndInfoSchema.h"
 
 #define MQ_TIMER_MS    3000
 #define TRNAS_TIMER_MS 6000
@@ -400,6 +400,11 @@ int32_t mndGetLoad(SMnode *pMnode, SMnodeLoad *pLoad) {
   return 0;
 }
 
+int32_t mndGetMonitorInfo(SMnode *pMnode, SMonClusterInfo *pClusterInfo, SMonVgroupInfo *pVgroupInfo,
+                          SMonGrantInfo *pGrantInfo) {
+                            return 0;
+                          }
+
 SMnodeMsg *mndInitMsg(SMnode *pMnode, SRpcMsg *pRpcMsg) {
   SMnodeMsg *pMsg = taosAllocateQitem(sizeof(SMnodeMsg));
   if (pMsg == NULL) {
@@ -505,10 +510,9 @@ void mndSetMsgHandle(SMnode *pMnode, tmsg_t msgType, MndMsgFp fp) {
   }
 }
 
-
 // Note: uid 0 is reserved
 uint64_t mndGenerateUid(char *name, int32_t len) {
-  int32_t  hashval = MurmurHash3_32(name, len);
+  int32_t hashval = MurmurHash3_32(name, len);
 
   do {
     int64_t  us = taosGetTimestampUs();
diff --git a/source/dnode/mnode/sdb/CMakeLists.txt b/source/dnode/mnode/sdb/CMakeLists.txt
index b6620f8be4..168d5063c2 100644
--- a/source/dnode/mnode/sdb/CMakeLists.txt
+++ b/source/dnode/mnode/sdb/CMakeLists.txt
@@ -1,13 +1,10 @@
 aux_source_directory(src MNODE_SRC)
-add_library(sdb ${MNODE_SRC})
+add_library(sdb STATIC ${MNODE_SRC})
 target_include_directories(
     sdb
     PUBLIC "${CMAKE_SOURCE_DIR}/include/dnode/mnode/sdb"
     PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
 )
 target_link_libraries(
-    sdb
-    PRIVATE os
-    PRIVATE common
-    PRIVATE util
+    sdb os common util
 )
\ No newline at end of file
diff --git a/source/dnode/qnode/CMakeLists.txt b/source/dnode/qnode/CMakeLists.txt
index f6f78f7357..92cd8fcb5c 100644
--- a/source/dnode/qnode/CMakeLists.txt
+++ b/source/dnode/qnode/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src QNODE_SRC)
-add_library(qnode ${QNODE_SRC})
+add_library(qnode STATIC ${QNODE_SRC})
 target_include_directories(
     qnode
     PUBLIC "${CMAKE_SOURCE_DIR}/include/dnode/qnode"
diff --git a/source/dnode/snode/CMakeLists.txt b/source/dnode/snode/CMakeLists.txt
index a94dd9edd8..dafd5d6594 100644
--- a/source/dnode/snode/CMakeLists.txt
+++ b/source/dnode/snode/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src SNODE_SRC)
-add_library(snode ${SNODE_SRC})
+add_library(snode STATIC ${SNODE_SRC})
 target_include_directories(
     snode
     PUBLIC "${CMAKE_SOURCE_DIR}/include/dnode/snode"
diff --git a/source/dnode/vnode/inc/tsdb.h b/source/dnode/vnode/inc/tsdb.h
index 677ca9c336..6bc89ddd66 100644
--- a/source/dnode/vnode/inc/tsdb.h
+++ b/source/dnode/vnode/inc/tsdb.h
@@ -27,12 +27,12 @@ extern "C" {
 
 typedef struct SDataStatis {
   int16_t colId;
-  int64_t sum;
-  int64_t max;
-  int64_t min;
   int16_t maxIndex;
   int16_t minIndex;
   int16_t numOfNull;
+  int64_t sum;
+  int64_t max;
+  int64_t min;
 } SDataStatis;
 
 typedef struct STable {
@@ -53,6 +53,8 @@ typedef struct STsdb STsdb;
 
 typedef struct STsdbCfg {
   int8_t   precision;
+  int8_t   update;
+  int8_t   compression;
   uint64_t lruCacheSize;
   int32_t  daysPerFile;
   int32_t  minRowsPerFileBlock;
@@ -60,8 +62,6 @@ typedef struct STsdbCfg {
   int32_t  keep;
   int32_t  keep1;
   int32_t  keep2;
-  int8_t   update;
-  int8_t   compression;
 } STsdbCfg;
 
 // query condition to build multi-table data block iterator
diff --git a/source/dnode/vnode/inc/vnode.h b/source/dnode/vnode/inc/vnode.h
index 9a4f920499..7718e0886d 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -63,10 +63,6 @@ typedef struct {
 } SVnodeCfg;
 
 typedef struct {
-  int32_t           sver;
-  const char       *timezone;
-  const char       *locale;
-  const char       *charset;
   uint16_t          nthreads;  // number of commit threads. 0 for no threads and a schedule queue should be given (TODO)
   PutReqToVQueryQFp putReqToVQueryQFp;
   SendReqToDnodeFp  sendReqToDnodeFp;
diff --git a/source/dnode/vnode/src/inc/tsdbFS.h b/source/dnode/vnode/src/inc/tsdbFS.h
index af432aa9d9..dab697ce8b 100644
--- a/source/dnode/vnode/src/inc/tsdbFS.h
+++ b/source/dnode/vnode/src/inc/tsdbFS.h
@@ -18,8 +18,6 @@
 
 #include "tsdbFile.h"
 
-#define TSDB_FS_VERSION 0
-
 // ================== TSDB global config
 extern bool tsdbForceKeepFile;
 
diff --git a/source/dnode/vnode/src/inc/tsdbFile.h b/source/dnode/vnode/src/inc/tsdbFile.h
index 15c8d512d6..bbeb6c6a0f 100644
--- a/source/dnode/vnode/src/inc/tsdbFile.h
+++ b/source/dnode/vnode/src/inc/tsdbFile.h
@@ -44,7 +44,37 @@
 #define TSDB_FILE_IS_OK(tf) (TSDB_FILE_STATE(tf) == TSDB_FILE_STATE_OK)
 #define TSDB_FILE_IS_BAD(tf) (TSDB_FILE_STATE(tf) == TSDB_FILE_STATE_BAD)
 
-typedef enum { TSDB_FILE_HEAD = 0, TSDB_FILE_DATA, TSDB_FILE_LAST, TSDB_FILE_MAX, TSDB_FILE_META } TSDB_FILE_T;
+typedef enum {
+  TSDB_FILE_HEAD = 0,  // .head
+  TSDB_FILE_DATA,      // .data
+  TSDB_FILE_LAST,      // .last
+  TSDB_FILE_SMAD,      // .smad(Block-wise SMA)
+  TSDB_FILE_SMAL,      // .smal(Block-wise SMA)
+  TSDB_FILE_MAX,       //
+  TSDB_FILE_META,      // meta
+  TSDB_FILE_TSMA,      // .tsma.${sma_index_name}, Time-range-wise SMA
+  TSDB_FILE_RSMA,      // .rsma.${sma_index_name}, Time-range-wise Rollup SMA
+} TSDB_FILE_T;
+
+typedef enum {
+  TSDB_FS_VER_0 = 0,
+  TSDB_FS_VER_MAX,
+} ETsdbFsVer;
+
+#define TSDB_LATEST_FVER    TSDB_FS_VER_0  // latest version for DFile
+#define TSDB_LATEST_SFS_VER TSDB_FS_VER_0  // latest version for 'current' file
+
+static FORCE_INLINE uint32_t tsdbGetDFSVersion(TSDB_FILE_T fType) {  // latest version for DFile
+  switch (fType) {
+    case TSDB_FILE_HEAD:  // .head
+    case TSDB_FILE_DATA:  // .data
+    case TSDB_FILE_LAST:  // .last
+    case TSDB_FILE_SMAD:  // .smad(Block-wise SMA)
+    case TSDB_FILE_SMAL:  // .smal(Block-wise SMA)
+    default:
+      return TSDB_LATEST_FVER;
+  }
+}
 
 #if 0
 // =============== SMFile
@@ -169,6 +199,7 @@ static FORCE_INLINE int64_t tsdbReadMFile(SMFile* pMFile, void* buf, int64_t nby
 // =============== SDFile
 typedef struct {
   uint32_t magic;
+  uint32_t fver;
   uint32_t len;
   uint32_t totalBlocks;
   uint32_t totalSubBlocks;
@@ -188,7 +219,7 @@ void  tsdbInitDFile(STsdb *pRepo, SDFile* pDFile, SDiskID did, int fid, uint32_t
 void  tsdbInitDFileEx(SDFile* pDFile, SDFile* pODFile);
 int   tsdbEncodeSDFile(void** buf, SDFile* pDFile);
 void* tsdbDecodeSDFile(STsdb *pRepo, void* buf, SDFile* pDFile);
-int   tsdbCreateDFile(STsdb *pRepo, SDFile* pDFile, bool updateHeader);
+int   tsdbCreateDFile(STsdb *pRepo, SDFile* pDFile, bool updateHeader, TSDB_FILE_T fType);
 int   tsdbUpdateDFileHeader(SDFile* pDFile);
 int   tsdbLoadDFileHeader(SDFile* pDFile, SDFInfo* pInfo);
 int   tsdbParseDFilename(const char* fname, int* vid, int* fid, TSDB_FILE_T* ftype, uint32_t* version);
@@ -292,12 +323,18 @@ static FORCE_INLINE int tsdbCopyDFile(SDFile* pSrc, SDFile* pDest) {
 
 // =============== SDFileSet
 typedef struct {
-  int    fid;
-  int    state;
-  SDFile files[TSDB_FILE_MAX];
+  int      fid;
+  int8_t   state;    // -128~127
+  uint8_t  ver;      // 0~255, DFileSet version
+  uint16_t reserve;
+  SDFile   files[TSDB_FILE_MAX];
 } SDFileSet;
 
+#define TSDB_LATEST_FSET_VER 0
+
 #define TSDB_FSET_FID(s) ((s)->fid)
+#define TSDB_FSET_STATE(s) ((s)->state)
+#define TSDB_FSET_VER(s) ((s)->ver)
 #define TSDB_DFILE_IN_SET(s, t) ((s)->files + (t))
 #define TSDB_FSET_LEVEL(s) TSDB_FILE_LEVEL(TSDB_DFILE_IN_SET(s, 0))
 #define TSDB_FSET_ID(s) TSDB_FILE_ID(TSDB_DFILE_IN_SET(s, 0))
diff --git a/source/dnode/vnode/src/inc/tsdbReadImpl.h b/source/dnode/vnode/src/inc/tsdbReadImpl.h
index 8ecb4e4a6e..16eb55967c 100644
--- a/source/dnode/vnode/src/inc/tsdbReadImpl.h
+++ b/source/dnode/vnode/src/inc/tsdbReadImpl.h
@@ -36,6 +36,7 @@ typedef struct {
   TSKEY    maxKey;
 } SBlockIdx;
 
+#ifdef TD_REFACTOR_3
 typedef struct {
   int64_t last : 1;
   int64_t offset : 63;
@@ -49,22 +50,35 @@ typedef struct {
   TSKEY   keyLast;
 } SBlock;
 
+#else
+
+typedef enum {
+  TSDB_SBLK_VER_0 = 0,
+  TSDB_SBLK_VER_MAX,
+} ESBlockVer;
+
+#define SBlockVerLatest TSDB_SBLK_VER_0
+
 typedef struct {
-  int64_t  last : 1;
-  int64_t  offset : 63;
-  int32_t  algorithm : 8;
-  int32_t  numOfRows : 24;
-  uint8_t  reserve0;
+  uint8_t  last : 1;
+  uint8_t  blkVer : 7;
   uint8_t  numOfSubBlocks;
   int16_t  numOfCols;    // not including timestamp column
-  uint32_t len : 32;     // data block length
+  uint32_t len;          // data block length
   uint32_t keyLen : 24;  // key column length, keyOffset = offset+sizeof(SBlockData)+sizeof(SBlockCol)*numOfCols
-  uint32_t reserve1 : 8;
-  uint64_t blkVer : 8;
-  uint64_t aggrOffset : 56;
+  uint32_t reserve : 8;
+  int32_t  algorithm : 8;
+  int32_t  numOfRows : 24;
+  int64_t  offset;
+  uint64_t aggrStat : 1;
+  uint64_t aggrOffset : 63;
   TSKEY    keyFirst;
   TSKEY    keyLast;
-} SBlock_3;
+} SBlockV0;
+
+#define SBlock SBlockV0  // latest SBlock definition
+
+#endif
 
 typedef struct {
   int32_t  delimiter;  // For recovery usage
@@ -73,6 +87,7 @@ typedef struct {
   SBlock   blocks[];
 } SBlockInfo;
 
+#ifdef TD_REFACTOR_3
 typedef struct {
   int16_t  colId;
   uint16_t bitmap : 1;  // 0: has bitmap if has NULL/NORM rows, 1: no bitmap if all rows are NORM
@@ -89,17 +104,50 @@ typedef struct {
   uint8_t  offsetH;
   char     padding[1];
 } SBlockCol;
+#else
+typedef struct {
+  int16_t  colId;
+  uint8_t  bitmap : 1;  // 0: has bitmap if has NULL/NORM rows, 1: no bitmap if all rows are NORM
+  uint8_t  reserve : 7;
+  uint8_t  type;
+  int32_t  len;
+  uint32_t offset;
+} SBlockColV0;
+
+#define SBlockCol SBlockColV0  // latest SBlockCol definition
+
+typedef struct {
+  int16_t colId;
+  int16_t maxIndex;
+  int16_t minIndex;
+  int16_t numOfNull;
+  int64_t sum;
+  int64_t max;
+  int64_t min;
+} SAggrBlkColV0;
+
+#define SAggrBlkCol SAggrBlkColV0  // latest SAggrBlkCol definition
+
+#endif
 
 // Code here just for back-ward compatibility
 static FORCE_INLINE void tsdbSetBlockColOffset(SBlockCol *pBlockCol, uint32_t offset) {
+#ifdef TD_REFACTOR_3
   pBlockCol->offset = offset & ((((uint32_t)1) << 24) - 1);
   pBlockCol->offsetH = (uint8_t)(offset >> 24);
+#else
+  pBlockCol->offset = offset;
+#endif
 }
 
 static FORCE_INLINE uint32_t tsdbGetBlockColOffset(SBlockCol *pBlockCol) {
+#ifdef TD_REFACTOR_3
   uint32_t offset1 = pBlockCol->offset;
   uint32_t offset2 = pBlockCol->offsetH;
   return (offset1 | (offset2 << 24));
+#else
+  return pBlockCol->offset;
+#endif
 }
 
 typedef struct {
@@ -109,31 +157,57 @@ typedef struct {
   SBlockCol cols[];
 } SBlockData;
 
+typedef void SAggrBlkData;  // SBlockCol cols[];
+
 struct SReadH {
-  STsdb *     pRepo;
-  SDFileSet   rSet;     // FSET to read
-  SArray *    aBlkIdx;  // SBlockIdx array
-  STable *    pTable;   // table to read
-  SBlockIdx * pBlkIdx;  // current reading table SBlockIdx
-  int         cidx;
-  SBlockInfo *pBlkInfo;
-  SBlockData *pBlkData;  // Block info
-  SDataCols * pDCols[2];
-  void *      pBuf;   // buffer
-  void *      pCBuf;  // compression buffer
+  STsdb *       pRepo;
+  SDFileSet     rSet;     // FSET to read
+  SArray *      aBlkIdx;  // SBlockIdx array
+  STable *      pTable;   // table to read
+  SBlockIdx *   pBlkIdx;  // current reading table SBlockIdx
+  int           cidx;
+  SBlockInfo *  pBlkInfo;
+  SBlockData *  pBlkData;      // Block info
+  SAggrBlkData *pAggrBlkData;  // Aggregate Block info
+  SDataCols *   pDCols[2];
+  void *        pBuf;    // buffer
+  void *        pCBuf;   // compression buffer
+  void *        pExBuf;  // extra buffer
 };
 
-#define TSDB_READ_REPO(rh) ((rh)->pRepo)
-#define TSDB_READ_REPO_ID(rh) REPO_ID(TSDB_READ_REPO(rh))
-#define TSDB_READ_FSET(rh) (&((rh)->rSet))
-#define TSDB_READ_TABLE(rh) ((rh)->pTable)
+#define TSDB_READ_REPO(rh)      ((rh)->pRepo)
+#define TSDB_READ_REPO_ID(rh)   REPO_ID(TSDB_READ_REPO(rh))
+#define TSDB_READ_FSET(rh)      (&((rh)->rSet))
+#define TSDB_READ_TABLE(rh)     ((rh)->pTable)
 #define TSDB_READ_HEAD_FILE(rh) TSDB_DFILE_IN_SET(TSDB_READ_FSET(rh), TSDB_FILE_HEAD)
 #define TSDB_READ_DATA_FILE(rh) TSDB_DFILE_IN_SET(TSDB_READ_FSET(rh), TSDB_FILE_DATA)
 #define TSDB_READ_LAST_FILE(rh) TSDB_DFILE_IN_SET(TSDB_READ_FSET(rh), TSDB_FILE_LAST)
-#define TSDB_READ_BUF(rh) ((rh)->pBuf)
-#define TSDB_READ_COMP_BUF(rh) ((rh)->pCBuf)
+#define TSDB_READ_SMAD_FILE(rh) TSDB_DFILE_IN_SET(TSDB_READ_FSET(rh), TSDB_FILE_SMAD)
+#define TSDB_READ_SMAL_FILE(rh) TSDB_DFILE_IN_SET(TSDB_READ_FSET(rh), TSDB_FILE_SMAL)
+#define TSDB_READ_BUF(rh)       ((rh)->pBuf)
+#define TSDB_READ_COMP_BUF(rh)  ((rh)->pCBuf)
+#define TSDB_READ_EXBUF(rh)     ((rh)->pExBuf)
 
-#define TSDB_BLOCK_STATIS_SIZE(ncols) (sizeof(SBlockData) + sizeof(SBlockCol) * (ncols) + sizeof(TSCKSUM))
+#define TSDB_BLOCK_STATIS_SIZE(ncols, blkVer) \
+  (sizeof(SBlockData) + sizeof(SBlockColV##blkVer) * (ncols) + sizeof(TSCKSUM))
+
+static FORCE_INLINE size_t tsdbBlockStatisSize(int nCols, uint32_t blkVer) {
+  switch (blkVer) {
+    case TSDB_SBLK_VER_0:
+    default:
+      return TSDB_BLOCK_STATIS_SIZE(nCols, 0);
+  }
+}
+
+#define TSDB_BLOCK_AGGR_SIZE(ncols, blkVer) (sizeof(SAggrBlkColV##blkVer) * (ncols) + sizeof(TSCKSUM))
+
+static FORCE_INLINE size_t tsdbBlockAggrSize(int nCols, uint32_t blkVer) {
+  switch (blkVer) {
+    case TSDB_SBLK_VER_0:
+    default:
+      return TSDB_BLOCK_AGGR_SIZE(nCols, 0);
+  }
+}
 
 int   tsdbInitReadH(SReadH *pReadh, STsdb *pRepo);
 void  tsdbDestroyReadH(SReadH *pReadh);
@@ -147,7 +221,7 @@ int   tsdbLoadBlockDataCols(SReadH *pReadh, SBlock *pBlock, SBlockInfo *pBlkInfo
 int   tsdbLoadBlockStatis(SReadH *pReadh, SBlock *pBlock);
 int   tsdbEncodeSBlockIdx(void **buf, SBlockIdx *pIdx);
 void *tsdbDecodeSBlockIdx(void *buf, SBlockIdx *pIdx);
-void  tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols);
+void  tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols, SBlock *pBlock);
 
 static FORCE_INLINE int tsdbMakeRoom(void **ppBuf, size_t size) {
   void * pBuf = *ppBuf;
diff --git a/source/dnode/vnode/src/tsdb/tsdbCommit.c b/source/dnode/vnode/src/tsdb/tsdbCommit.c
index f7e4d56fe2..2e7116969e 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCommit.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCommit.c
@@ -50,8 +50,11 @@ typedef struct {
 #define TSDB_COMMIT_HEAD_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_HEAD)
 #define TSDB_COMMIT_DATA_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_DATA)
 #define TSDB_COMMIT_LAST_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_LAST)
+#define TSDB_COMMIT_SMAD_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_SMAD)
+#define TSDB_COMMIT_SMAL_FILE(ch) TSDB_DFILE_IN_SET(TSDB_COMMIT_WRITE_FSET(ch), TSDB_FILE_SMAL)
 #define TSDB_COMMIT_BUF(ch) TSDB_READ_BUF(&((ch)->readh))
 #define TSDB_COMMIT_COMP_BUF(ch) TSDB_READ_COMP_BUF(&((ch)->readh))
+#define TSDB_COMMIT_EXBUF(ch) TSDB_READ_EXBUF(&((ch)->readh))
 #define TSDB_COMMIT_DEFAULT_ROWS(ch) TSDB_DEFAULT_BLOCK_ROWS(TSDB_COMMIT_REPO(ch)->config.maxRowsPerFileBlock)
 #define TSDB_COMMIT_TXN_VERSION(ch) FS_TXN_VERSION(REPO_FS(TSDB_COMMIT_REPO(ch)))
 
@@ -509,7 +512,7 @@ static int tsdbSetAndOpenCommitFile(SCommitH *pCommith, SDFileSet *pSet, int fid
     // TSDB_FILE_HEAD
     SDFile *pWHeadf = TSDB_COMMIT_HEAD_FILE(pCommith);
     tsdbInitDFile(pRepo, pWHeadf, did, fid, FS_TXN_VERSION(REPO_FS(pRepo)), TSDB_FILE_HEAD);
-    if (tsdbCreateDFile(pRepo, pWHeadf, true) < 0) {
+    if (tsdbCreateDFile(pRepo, pWHeadf, true, TSDB_FILE_HEAD) < 0) {
       tsdbError("vgId:%d failed to create file %s to commit since %s", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pWHeadf),
                 tstrerror(terrno));
 
@@ -560,7 +563,7 @@ static int tsdbSetAndOpenCommitFile(SCommitH *pCommith, SDFileSet *pSet, int fid
       tsdbInitDFile(pRepo, pWLastf, did, fid, FS_TXN_VERSION(REPO_FS(pRepo)), TSDB_FILE_LAST);
       pCommith->isLFileSame = false;
 
-      if (tsdbCreateDFile(pRepo, pWLastf, true) < 0) {
+      if (tsdbCreateDFile(pRepo, pWLastf, true, TSDB_FILE_LAST) < 0) {
         tsdbError("vgId:%d failed to create file %s to commit since %s", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pWLastf),
                   tstrerror(terrno));
 
@@ -572,6 +575,74 @@ static int tsdbSetAndOpenCommitFile(SCommitH *pCommith, SDFileSet *pSet, int fid
         }
       }
     }
+
+    // TSDB_FILE_SMAD
+    SDFile *pRSmadF = TSDB_READ_SMAD_FILE(&(pCommith->readh));
+    SDFile *pWSmadF = TSDB_COMMIT_SMAD_FILE(pCommith);
+
+    if (access(TSDB_FILE_FULL_NAME(pRSmadF), F_OK) != 0) {
+      tsdbDebug("vgId:%d create data file %s as not exist", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pRSmadF));
+      tsdbInitDFile(pRepo, pWSmadF, did, fid, FS_TXN_VERSION(REPO_FS(pRepo)), TSDB_FILE_SMAD);
+
+      if (tsdbCreateDFile(pRepo, pWSmadF, true, TSDB_FILE_SMAD) < 0) {
+        tsdbError("vgId:%d failed to create file %s to commit since %s", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pWSmadF),
+                  tstrerror(terrno));
+
+        tsdbCloseDFileSet(pWSet);
+        (void)tsdbRemoveDFile(pWHeadf);
+        if (pCommith->isRFileSet) {
+          tsdbCloseAndUnsetFSet(&(pCommith->readh));
+          return -1;
+        }
+      }
+    } else {
+      tsdbInitDFileEx(pWSmadF, pRSmadF);
+      if (tsdbOpenDFile(pWSmadF, O_RDWR) < 0) {
+        tsdbError("vgId:%d failed to open file %s to commit since %s", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pWSmadF),
+                  tstrerror(terrno));
+
+        tsdbCloseDFileSet(pWSet);
+        tsdbRemoveDFile(pWHeadf);
+        if (pCommith->isRFileSet) {
+          tsdbCloseAndUnsetFSet(&(pCommith->readh));
+          return -1;
+        }
+      }
+    }
+
+    // TSDB_FILE_SMAL
+    SDFile *pRSmalF = TSDB_READ_SMAL_FILE(&(pCommith->readh));
+    SDFile *pWSmalF = TSDB_COMMIT_SMAL_FILE(pCommith);
+
+    if ((pCommith->isLFileSame) && access(TSDB_FILE_FULL_NAME(pRSmalF), F_OK) == 0) {
+      tsdbInitDFileEx(pWSmalF, pRSmalF);
+      if (tsdbOpenDFile(pWSmalF, O_RDWR) < 0) {
+        tsdbError("vgId:%d failed to open file %s to commit since %s", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pWSmalF),
+                  tstrerror(terrno));
+
+        tsdbCloseDFileSet(pWSet);
+        tsdbRemoveDFile(pWHeadf);
+        if (pCommith->isRFileSet) {
+          tsdbCloseAndUnsetFSet(&(pCommith->readh));
+          return -1;
+        }
+      }
+    } else {
+      tsdbDebug("vgId:%d create data file %s as not exist", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pRSmalF));
+      tsdbInitDFile(pRepo, pWSmalF, did, fid, FS_TXN_VERSION(REPO_FS(pRepo)), TSDB_FILE_SMAL);
+
+      if (tsdbCreateDFile(pRepo, pWSmalF, true, TSDB_FILE_SMAL) < 0) {
+        tsdbError("vgId:%d failed to create file %s to commit since %s", REPO_ID(pRepo), TSDB_FILE_FULL_NAME(pWSmalF),
+                  tstrerror(terrno));
+
+        tsdbCloseDFileSet(pWSet);
+        (void)tsdbRemoveDFile(pWHeadf);
+        if (pCommith->isRFileSet) {
+          tsdbCloseAndUnsetFSet(&(pCommith->readh));
+          return -1;
+        }
+      }
+    }
   }
 
   return 0;
@@ -1131,41 +1202,57 @@ static int tsdbComparKeyBlock(const void *arg1, const void *arg2) {
   }
 }
 
-int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDataCols *pDataCols, SBlock *pBlock, bool isLast,
-                       bool isSuper, void **ppBuf, void **ppCBuf) {
-  STsdbCfg   *pCfg = REPO_CFG(pRepo);
-  SBlockData *pBlockData;
-  int64_t     offset = 0;
-  int         rowsToWrite = pDataCols->numOfRows;
+int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDFile *pDFileAggr, SDataCols *pDataCols,
+                       SBlock *pBlock, bool isLast, bool isSuper, void **ppBuf, void **ppCBuf, void **ppExBuf) {
+  STsdbCfg *    pCfg = REPO_CFG(pRepo);
+  SBlockData *  pBlockData = NULL;
+  SAggrBlkData *pAggrBlkData = NULL;
+  int64_t       offset = 0, offsetAggr = 0;
+  int           rowsToWrite = pDataCols->numOfRows;
 
   ASSERT(rowsToWrite > 0 && rowsToWrite <= pCfg->maxRowsPerFileBlock);
   ASSERT((!isLast) || rowsToWrite < pCfg->minRowsPerFileBlock);
 
   // Make buffer space
-  if (tsdbMakeRoom(ppBuf, TSDB_BLOCK_STATIS_SIZE(pDataCols->numOfCols)) < 0) {
+  if (tsdbMakeRoom(ppBuf, tsdbBlockStatisSize(pDataCols->numOfCols, SBlockVerLatest)) < 0) {
     return -1;
   }
   pBlockData = (SBlockData *)(*ppBuf);
 
+  if (tsdbMakeRoom(ppExBuf, tsdbBlockAggrSize(pDataCols->numOfCols, SBlockVerLatest)) < 0) {
+    return -1;
+  }
+  pAggrBlkData = (SAggrBlkData *)(*ppExBuf);
+
   // Get # of cols not all NULL(not including key column)
   int nColsNotAllNull = 0;
-  for (int ncol = 1; ncol < pDataCols->numOfCols; ncol++) {  // ncol from 1, we skip the timestamp column
-    SDataCol  *pDataCol = pDataCols->cols + ncol;
-    SBlockCol *pBlockCol = pBlockData->cols + nColsNotAllNull;
+  for (int ncol = 1; ncol < pDataCols->numOfCols; ++ncol) {  // ncol from 1, we skip the timestamp column
+    SDataCol *   pDataCol = pDataCols->cols + ncol;
+    SBlockCol *  pBlockCol = pBlockData->cols + nColsNotAllNull;
+    SAggrBlkCol *pAggrBlkCol = (SAggrBlkCol *)pAggrBlkData + nColsNotAllNull;
 
     if (isAllRowsNull(pDataCol)) {  // all data to commit are NULL, just ignore it
       continue;
     }
 
     memset(pBlockCol, 0, sizeof(*pBlockCol));
+    memset(pAggrBlkCol, 0, sizeof(*pAggrBlkCol));
 
     pBlockCol->colId = pDataCol->colId;
     pBlockCol->type = pDataCol->type;
+    pAggrBlkCol->colId = pDataCol->colId;
+
     if (tDataTypes[pDataCol->type].statisFunc) {
+#if 0
       (*tDataTypes[pDataCol->type].statisFunc)(pDataCol->pData, rowsToWrite, &(pBlockCol->min), &(pBlockCol->max),
                                                &(pBlockCol->sum), &(pBlockCol->minIndex), &(pBlockCol->maxIndex),
                                                &(pBlockCol->numOfNull));
-      if (pBlockCol->numOfNull == 0) {
+#endif
+      (*tDataTypes[pDataCol->type].statisFunc)(pDataCol->pData, rowsToWrite, &(pAggrBlkCol->min), &(pAggrBlkCol->max),
+                                               &(pAggrBlkCol->sum), &(pAggrBlkCol->minIndex), &(pAggrBlkCol->maxIndex),
+                                               &(pAggrBlkCol->numOfNull));
+
+      if (pAggrBlkCol->numOfNull == 0) {
         TD_SET_COL_ROWS_NORM(pBlockCol);
       } else {
         TD_SET_COL_ROWS_MISC(pBlockCol);
@@ -1181,13 +1268,14 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDataCols *
   // Compress the data if neccessary
   int      tcol = 0;  // counter of not all NULL and written columns
   uint32_t toffset = 0;
-  int32_t  tsize = TSDB_BLOCK_STATIS_SIZE(nColsNotAllNull);
+  int32_t  tsize = (int32_t)tsdbBlockStatisSize(nColsNotAllNull, SBlockVerLatest);
   int32_t  lsize = tsize;
+  uint32_t tsizeAggr = (uint32_t)tsdbBlockAggrSize(nColsNotAllNull, SBlockVerLatest);
   int32_t  keyLen = 0;
   int32_t  nBitmaps = (int32_t)TD_BITMAP_BYTES(rowsToWrite);
   int32_t  tBitmaps = 0;
 
-  for (int ncol = 0; ncol < pDataCols->numOfCols; ncol++) {
+  for (int ncol = 0; ncol < pDataCols->numOfCols; ++ncol) {
     // All not NULL columns finish
     if (ncol != 0 && tcol >= nColsNotAllNull) break;
 
@@ -1248,7 +1336,7 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDataCols *
     if (ncol != 0) {
       tsdbSetBlockColOffset(pBlockCol, toffset);
       pBlockCol->len = flen;
-      tcol++;
+      ++tcol;
     } else {
       keyLen = flen;
     }
@@ -1269,6 +1357,18 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDataCols *
     return -1;
   }
 
+  uint32_t aggrStatus = nColsNotAllNull > 0 ? 1 : 0;
+  if (aggrStatus > 0) {
+
+    taosCalcChecksumAppend(0, (uint8_t *)pAggrBlkData, tsizeAggr);
+    tsdbUpdateDFileMagic(pDFileAggr, POINTER_SHIFT(pAggrBlkData, tsizeAggr - sizeof(TSCKSUM)));
+
+    // Write the whole block to file
+    if (tsdbAppendDFile(pDFileAggr, (void *)pAggrBlkData, tsizeAggr, &offsetAggr) < tsizeAggr) {
+      return -1;
+    }
+  }
+
   // Update pBlock membership vairables
   pBlock->last = isLast;
   pBlock->offset = offset;
@@ -1280,6 +1380,9 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDataCols *
   pBlock->numOfCols = nColsNotAllNull;
   pBlock->keyFirst = dataColsKeyFirst(pDataCols);
   pBlock->keyLast = dataColsKeyLast(pDataCols);
+  pBlock->aggrStat = aggrStatus;
+  pBlock->blkVer = SBlockVerLatest;
+  pBlock->aggrOffset = (uint64_t)offsetAggr;
 
   tsdbDebug("vgId:%d uid:%" PRId64 " a block of data is written to file %s, offset %" PRId64
             " numOfRows %d len %d numOfCols %" PRId16 " keyFirst %" PRId64 " keyLast %" PRId64,
@@ -1291,9 +1394,10 @@ int tsdbWriteBlockImpl(STsdb *pRepo, STable *pTable, SDFile *pDFile, SDataCols *
 
 static int tsdbWriteBlock(SCommitH *pCommith, SDFile *pDFile, SDataCols *pDataCols, SBlock *pBlock, bool isLast,
                           bool isSuper) {
-  return tsdbWriteBlockImpl(TSDB_COMMIT_REPO(pCommith), TSDB_COMMIT_TABLE(pCommith), pDFile, pDataCols, pBlock, isLast,
-                            isSuper, (void **)(&(TSDB_COMMIT_BUF(pCommith))),
-                            (void **)(&(TSDB_COMMIT_COMP_BUF(pCommith))));
+  return tsdbWriteBlockImpl(TSDB_COMMIT_REPO(pCommith), TSDB_COMMIT_TABLE(pCommith), pDFile,
+                            isLast ? TSDB_COMMIT_SMAL_FILE(pCommith) : TSDB_COMMIT_SMAD_FILE(pCommith), pDataCols,
+                            pBlock, isLast, isSuper, (void **)(&(TSDB_COMMIT_BUF(pCommith))),
+                            (void **)(&(TSDB_COMMIT_COMP_BUF(pCommith))), (void **)(&(TSDB_COMMIT_EXBUF(pCommith))));
 }
 
 static int tsdbWriteBlockInfo(SCommitH *pCommih) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbCompact.c b/source/dnode/vnode/src/tsdb/tsdbCompact.c
index 80b59d8756..e24d5974af 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCompact.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCompact.c
@@ -38,6 +38,8 @@ typedef struct {
 #define TSDB_COMPACT_HEAD_FILE(pComph) TSDB_DFILE_IN_SET(TSDB_COMPACT_WSET(pComph), TSDB_FILE_HEAD)
 #define TSDB_COMPACT_DATA_FILE(pComph) TSDB_DFILE_IN_SET(TSDB_COMPACT_WSET(pComph), TSDB_FILE_DATA)
 #define TSDB_COMPACT_LAST_FILE(pComph) TSDB_DFILE_IN_SET(TSDB_COMPACT_WSET(pComph), TSDB_FILE_LAST)
+#define TSDB_COMPACT_SMAD_FILE(pComph) TSDB_DFILE_IN_SET(TSDB_COMPACT_WSET(pComph), TSDB_FILE_SMAD)
+#define TSDB_COMPACT_SMAL_FILE(pComph) TSDB_DFILE_IN_SET(TSDB_COMPACT_WSET(pComph), TSDB_FILE_SMAL)
 #define TSDB_COMPACT_BUF(pComph) TSDB_READ_BUF(&((pComph)->readh))
 #define TSDB_COMPACT_COMP_BUF(pComph) TSDB_READ_COMP_BUF(&((pComph)->readh))
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbFS.c b/source/dnode/vnode/src/tsdb/tsdbFS.c
index 24c765d3e5..dcc9700d83 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFS.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFS.c
@@ -422,7 +422,7 @@ static int tsdbSaveFSStatus(STsdb *pRepo, SFSStatus *pStatus) {
     return -1;
   }
 
-  fsheader.version = TSDB_FS_VERSION;
+  fsheader.version = TSDB_LATEST_SFS_VER;
   if (taosArrayGetSize(pStatus->df) == 0) {
     fsheader.len = 0;
   } else {
@@ -697,7 +697,7 @@ static int tsdbOpenFSFromCurrent(STsdb *pRepo) {
   ptr = tsdbDecodeFSHeader(ptr, &fsheader);
   ptr = tsdbDecodeFSMeta(ptr, &(pStatus->meta));
 
-  if (fsheader.version != TSDB_FS_VERSION) {
+  if (fsheader.version != TSDB_LATEST_SFS_VER) {
     // TODO: handle file version change
   }
 
diff --git a/source/dnode/vnode/src/tsdb/tsdbFile.c b/source/dnode/vnode/src/tsdb/tsdbFile.c
index 5a00fa20a0..4d70c429ff 100644
--- a/source/dnode/vnode/src/tsdb/tsdbFile.c
+++ b/source/dnode/vnode/src/tsdb/tsdbFile.c
@@ -19,8 +19,12 @@ static const char *TSDB_FNAME_SUFFIX[] = {
     "head",  // TSDB_FILE_HEAD
     "data",  // TSDB_FILE_DATA
     "last",  // TSDB_FILE_LAST
+    "smad",  // TSDB_FILE_SMAD
+    "smal",  // TSDB_FILE_SMAL
     "",      // TSDB_FILE_MAX
     "meta",  // TSDB_FILE_META
+    "tsma",  // TSDB_FILE_TSMA
+    "rsma",  // TSDB_FILE_RSMA
 };
 
 static void tsdbGetFilename(int vid, int fid, uint32_t ver, TSDB_FILE_T ftype, char *fname);
@@ -304,6 +308,7 @@ void tsdbInitDFile(STsdb *pRepo, SDFile *pDFile, SDiskID did, int fid, uint32_t
 
   memset(&(pDFile->info), 0, sizeof(pDFile->info));
   pDFile->info.magic = TSDB_FILE_INIT_MAGIC;
+  pDFile->info.fver = tsdbGetDFSVersion(ftype);
 
   tsdbGetFilename(pRepo->vgId, fid, ver, ftype, fname);
   tfsInitFile(pRepo->pTfs, &(pDFile->f), did, fname);
@@ -341,7 +346,7 @@ static int tsdbEncodeSDFileEx(void **buf, SDFile *pDFile) {
 }
 
 static void *tsdbDecodeSDFileEx(void *buf, SDFile *pDFile) {
-  char *aname;
+  char *aname = NULL;
 
   buf = tsdbDecodeDFInfo(buf, &(pDFile->info));
   buf = taosDecodeString(buf, &aname);
@@ -352,7 +357,7 @@ static void *tsdbDecodeSDFileEx(void *buf, SDFile *pDFile) {
   return buf;
 }
 
-int tsdbCreateDFile(STsdb *pRepo, SDFile *pDFile, bool updateHeader) {
+int tsdbCreateDFile(STsdb *pRepo, SDFile *pDFile, bool updateHeader, TSDB_FILE_T fType) {
   ASSERT(pDFile->info.size == 0 && pDFile->info.magic == TSDB_FILE_INIT_MAGIC);
 
   pDFile->pFile = taosOpenFile(TSDB_FILE_FULL_NAME(pDFile), TD_FILE_CTEATE | TD_FILE_WRITE | TD_FILE_TRUNC);
@@ -382,6 +387,7 @@ int tsdbCreateDFile(STsdb *pRepo, SDFile *pDFile, bool updateHeader) {
   }
 
   pDFile->info.size += TSDB_FILE_HEAD_SIZE;
+  pDFile->info.fver = tsdbGetDFSVersion(fType);
 
   if (tsdbUpdateDFileHeader(pDFile) < 0) {
     tsdbCloseDFile(pDFile);
@@ -493,6 +499,7 @@ static int tsdbEncodeDFInfo(void **buf, SDFInfo *pInfo) {
   int tlen = 0;
 
   tlen += taosEncodeFixedU32(buf, pInfo->magic);
+  tlen += taosEncodeFixedU32(buf, pInfo->fver);
   tlen += taosEncodeFixedU32(buf, pInfo->len);
   tlen += taosEncodeFixedU32(buf, pInfo->totalBlocks);
   tlen += taosEncodeFixedU32(buf, pInfo->totalSubBlocks);
@@ -505,6 +512,7 @@ static int tsdbEncodeDFInfo(void **buf, SDFInfo *pInfo) {
 
 static void *tsdbDecodeDFInfo(void *buf, SDFInfo *pInfo) {
   buf = taosDecodeFixedU32(buf, &(pInfo->magic));
+  buf = taosDecodeFixedU32(buf, &(pInfo->fver));
   buf = taosDecodeFixedU32(buf, &(pInfo->len));
   buf = taosDecodeFixedU32(buf, &(pInfo->totalBlocks));
   buf = taosDecodeFixedU32(buf, &(pInfo->totalSubBlocks));
@@ -562,8 +570,10 @@ static int tsdbRollBackDFile(SDFile *pDFile) {
 
 // ============== Operations on SDFileSet
 void tsdbInitDFileSet(STsdb *pRepo, SDFileSet *pSet, SDiskID did, int fid, uint32_t ver) {
-  pSet->fid = fid;
-  pSet->state = 0;
+  TSDB_FSET_FID(pSet) = fid;
+  TSDB_FSET_VER(pSet) = TSDB_LATEST_FSET_VER;
+  TSDB_FSET_STATE(pSet) = 0;
+  pSet->reserve = 0;
 
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
     SDFile *pDFile = TSDB_DFILE_IN_SET(pSet, ftype);
@@ -572,7 +582,7 @@ void tsdbInitDFileSet(STsdb *pRepo, SDFileSet *pSet, SDiskID did, int fid, uint3
 }
 
 void tsdbInitDFileSetEx(SDFileSet *pSet, SDFileSet *pOSet) {
-  pSet->fid = pOSet->fid;
+  TSDB_FSET_FID(pSet) = TSDB_FSET_FID(pOSet);
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
     tsdbInitDFileEx(TSDB_DFILE_IN_SET(pSet, ftype), TSDB_DFILE_IN_SET(pOSet, ftype));
   }
@@ -581,7 +591,10 @@ void tsdbInitDFileSetEx(SDFileSet *pSet, SDFileSet *pOSet) {
 int tsdbEncodeDFileSet(void **buf, SDFileSet *pSet) {
   int tlen = 0;
 
-  tlen += taosEncodeFixedI32(buf, pSet->fid);
+  tlen += taosEncodeFixedI32(buf, TSDB_FSET_FID(pSet));
+  // state not included
+  tlen += taosEncodeFixedU8(buf, TSDB_FSET_VER(pSet));
+  tlen += taosEncodeFixedU16(buf, pSet->reserve);
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
     tlen += tsdbEncodeSDFile(buf, TSDB_DFILE_IN_SET(pSet, ftype));
   }
@@ -590,11 +603,11 @@ int tsdbEncodeDFileSet(void **buf, SDFileSet *pSet) {
 }
 
 void *tsdbDecodeDFileSet(STsdb *pRepo, void *buf, SDFileSet *pSet) {
-  int32_t fid;
+  buf = taosDecodeFixedI32(buf, &(TSDB_FSET_FID(pSet)));
+  TSDB_FSET_STATE(pSet) = 0;
+  buf = taosDecodeFixedU8(buf, &(TSDB_FSET_VER(pSet)));
+  buf = taosDecodeFixedU16(buf, &(pSet->reserve));
 
-  buf = taosDecodeFixedI32(buf, &(fid));
-  pSet->state = 0;
-  pSet->fid = fid;
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
     buf = tsdbDecodeSDFile(pRepo, buf, TSDB_DFILE_IN_SET(pSet, ftype));
   }
@@ -604,7 +617,9 @@ void *tsdbDecodeDFileSet(STsdb *pRepo, void *buf, SDFileSet *pSet) {
 int tsdbEncodeDFileSetEx(void **buf, SDFileSet *pSet) {
   int tlen = 0;
 
-  tlen += taosEncodeFixedI32(buf, pSet->fid);
+  tlen += taosEncodeFixedI32(buf, TSDB_FSET_FID(pSet));
+  tlen += taosEncodeFixedU8(buf, TSDB_FSET_VER(pSet));
+  tlen += taosEncodeFixedU16(buf, pSet->reserve);
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
     tlen += tsdbEncodeSDFileEx(buf, TSDB_DFILE_IN_SET(pSet, ftype));
   }
@@ -613,10 +628,10 @@ int tsdbEncodeDFileSetEx(void **buf, SDFileSet *pSet) {
 }
 
 void *tsdbDecodeDFileSetEx(void *buf, SDFileSet *pSet) {
-  int32_t fid;
+  buf = taosDecodeFixedI32(buf, &(TSDB_FSET_FID(pSet)));
+  buf = taosDecodeFixedU8(buf, &(TSDB_FSET_VER(pSet)));
+  buf = taosDecodeFixedU16(buf, &(pSet->reserve));
 
-  buf = taosDecodeFixedI32(buf, &(fid));
-  pSet->fid = fid;
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
     buf = tsdbDecodeSDFileEx(buf, TSDB_DFILE_IN_SET(pSet, ftype));
   }
@@ -637,7 +652,7 @@ int tsdbApplyDFileSetChange(SDFileSet *from, SDFileSet *to) {
 
 int tsdbCreateDFileSet(STsdb *pRepo, SDFileSet *pSet, bool updateHeader) {
   for (TSDB_FILE_T ftype = 0; ftype < TSDB_FILE_MAX; ftype++) {
-    if (tsdbCreateDFile(pRepo, TSDB_DFILE_IN_SET(pSet, ftype), updateHeader) < 0) {
+    if (tsdbCreateDFile(pRepo, TSDB_DFILE_IN_SET(pSet, ftype), updateHeader, ftype) < 0) {
       tsdbCloseDFileSet(pSet);
       tsdbRemoveDFileSet(pSet);
       return -1;
diff --git a/source/dnode/vnode/src/tsdb/tsdbMain.c b/source/dnode/vnode/src/tsdb/tsdbMain.c
index 812ec67ec4..2d8c470113 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMain.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMain.c
@@ -821,9 +821,10 @@ static int tsdbRestoreLastColumns(STsdbRepo *pRepo, STable *pTable, SReadH* pRea
 
     // file block with sub-blocks has no statistics data
     if (pBlock->numOfSubBlocks <= 1) {
-      tsdbLoadBlockStatis(pReadh, pBlock);
-      tsdbGetBlockStatis(pReadh, pBlockStatis, (int)numColumns);
-      loadStatisData = true;
+      if (tsdbLoadBlockStatis(pReadh, pBlock) == TSDB_STATIS_OK) {
+        tsdbGetBlockStatis(pReadh, pBlockStatis, (int)numColumns, pBlock);
+        loadStatisData = true;
+      }
     }
 
     for (int16_t i = 0; i < numColumns && numColumns > pTable->restoreColumnNum; ++i) {
diff --git a/source/dnode/vnode/src/tsdb/tsdbRead.c b/source/dnode/vnode/src/tsdb/tsdbRead.c
index c1cf776cb5..4bd0ee959e 100644
--- a/source/dnode/vnode/src/tsdb/tsdbRead.c
+++ b/source/dnode/vnode/src/tsdb/tsdbRead.c
@@ -3276,8 +3276,12 @@ int32_t tsdbRetrieveDataBlockStatisInfo(tsdbReaderT* pTsdbReadHandle, SDataStati
   }
 
   int64_t stime = taosGetTimestampUs();
-  if (tsdbLoadBlockStatis(&pHandle->rhelper, pBlockInfo->compBlock) < 0) {
+  int     statisStatus = tsdbLoadBlockStatis(&pHandle->rhelper, pBlockInfo->compBlock);
+  if (statisStatus < TSDB_STATIS_OK) {
     return terrno;
+  } else if (statisStatus > TSDB_STATIS_OK) {
+    *pBlockStatis = NULL;
+    return TSDB_CODE_SUCCESS;
   }
 
   int16_t* colIds = pHandle->defaultLoadColumn->pData;
@@ -3288,7 +3292,7 @@ int32_t tsdbRetrieveDataBlockStatisInfo(tsdbReaderT* pTsdbReadHandle, SDataStati
     pHandle->statis[i].colId = colIds[i];
   }
 
-  tsdbGetBlockStatis(&pHandle->rhelper, pHandle->statis, (int)numOfCols);
+  tsdbGetBlockStatis(&pHandle->rhelper, pHandle->statis, (int)numOfCols, pBlockInfo->compBlock);
 
   // always load the first primary timestamp column data
   SDataStatis* pPrimaryColStatis = &pHandle->statis[0];
diff --git a/source/dnode/vnode/src/tsdb/tsdbReadImpl.c b/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
index 7e8e7866d7..f6827eaae1 100644
--- a/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
+++ b/source/dnode/vnode/src/tsdb/tsdbReadImpl.c
@@ -19,6 +19,7 @@
 
 static void tsdbResetReadTable(SReadH *pReadh);
 static void tsdbResetReadFile(SReadH *pReadh);
+static int  tsdbLoadBlockOffset(SReadH *pReadh, SBlock *pBlock);
 static int  tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDataCols);
 static int  tsdbCheckAndDecodeColumnData(SDataCol *pDataCol, void *content, int32_t len, int8_t comp, int numOfRows,
                                          int numOfBitmaps, int lenOfBitmaps, int maxPoints, char *buffer,
@@ -63,10 +64,12 @@ int tsdbInitReadH(SReadH *pReadh, STsdb *pRepo) {
 void tsdbDestroyReadH(SReadH *pReadh) {
   if (pReadh == NULL) return;
 
+  pReadh->pExBuf = taosTZfree(pReadh->pExBuf);
   pReadh->pCBuf = taosTZfree(pReadh->pCBuf);
   pReadh->pBuf = taosTZfree(pReadh->pBuf);
   pReadh->pDCols[0] = tdFreeDataCols(pReadh->pDCols[0]);
   pReadh->pDCols[1] = tdFreeDataCols(pReadh->pDCols[1]);
+  pReadh->pAggrBlkData = taosTZfree(pReadh->pAggrBlkData);
   pReadh->pBlkData = taosTZfree(pReadh->pBlkData);
   pReadh->pBlkInfo = taosTZfree(pReadh->pBlkInfo);
   pReadh->cidx = 0;
@@ -305,15 +308,58 @@ int tsdbLoadBlockDataCols(SReadH *pReadh, SBlock *pBlock, SBlockInfo *pBlkInfo,
 int tsdbLoadBlockStatis(SReadH *pReadh, SBlock *pBlock) {
   ASSERT(pBlock->numOfSubBlocks <= 1);
 
-  SDFile *pDFile = (pBlock->last) ? TSDB_READ_LAST_FILE(pReadh) : TSDB_READ_DATA_FILE(pReadh);
+  if (!pBlock->aggrStat) {
+    return TSDB_STATIS_NONE;
+  }
 
+  SDFile *pDFileAggr = pBlock->last ? TSDB_READ_SMAL_FILE(pReadh) : TSDB_READ_SMAD_FILE(pReadh);
+
+  if (tsdbSeekDFile(pDFileAggr, pBlock->aggrOffset, SEEK_SET) < 0) {
+    tsdbError("vgId:%d failed to load block aggr part while seek file %s to offset %" PRIu64 " since %s",
+              TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFileAggr), (uint64_t)pBlock->aggrOffset,
+              tstrerror(terrno));
+    return -1;
+  }
+
+  size_t sizeAggr = tsdbBlockAggrSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer);
+  if (tsdbMakeRoom((void **)(&(pReadh->pAggrBlkData)), sizeAggr) < 0) return -1;
+
+  int64_t nreadAggr = tsdbReadDFile(pDFileAggr, (void *)(pReadh->pAggrBlkData), sizeAggr);
+  if (nreadAggr < 0) {
+    tsdbError("vgId:%d failed to load block aggr part while read file %s since %s, offset:%" PRIu64 " len :%" PRIzu,
+              TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFileAggr), tstrerror(terrno),
+              (uint64_t)pBlock->aggrOffset, sizeAggr);
+    return -1;
+  }
+
+  if (nreadAggr < sizeAggr) {
+    terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
+    tsdbError("vgId:%d block aggr part in file %s is corrupted, offset:%" PRIu64 " expected bytes:%" PRIzu
+              " read bytes: %" PRId64,
+              TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFileAggr), (uint64_t)pBlock->aggrOffset, sizeAggr,
+              nreadAggr);
+    return -1;
+  }
+
+  if (!taosCheckChecksumWhole((uint8_t *)(pReadh->pAggrBlkData), (uint32_t)sizeAggr)) {
+    terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
+    tsdbError("vgId:%d block aggr part in file %s is corrupted since wrong checksum, offset:%" PRIu64 " len :%" PRIzu,
+              TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFileAggr), (uint64_t)pBlock->aggrOffset, sizeAggr);
+    return -1;
+  }
+  return 0;
+}
+
+static int tsdbLoadBlockOffset(SReadH *pReadh, SBlock *pBlock) {
+  ASSERT(pBlock->numOfSubBlocks <= 1);
+  SDFile *pDFile = (pBlock->last) ? TSDB_READ_LAST_FILE(pReadh) : TSDB_READ_DATA_FILE(pReadh);
   if (tsdbSeekDFile(pDFile, pBlock->offset, SEEK_SET) < 0) {
     tsdbError("vgId:%d failed to load block statis part while seek file %s to offset %" PRId64 " since %s",
               TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFile), (int64_t)pBlock->offset, tstrerror(terrno));
     return -1;
   }
 
-  size_t size = TSDB_BLOCK_STATIS_SIZE(pBlock->numOfCols);
+  size_t size = tsdbBlockStatisSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer);
   if (tsdbMakeRoom((void **)(&(pReadh->pBlkData)), size) < 0) return -1;
 
   int64_t nread = tsdbReadDFile(pDFile, (void *)(pReadh->pBlkData), size);
@@ -337,7 +383,6 @@ int tsdbLoadBlockStatis(SReadH *pReadh, SBlock *pBlock) {
               TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFile), (int64_t)pBlock->offset, size);
     return -1;
   }
-
   return 0;
 }
 
@@ -375,13 +420,14 @@ void *tsdbDecodeSBlockIdx(void *buf, SBlockIdx *pIdx) {
   return buf;
 }
 
-void tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols) {
+void tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols, SBlock *pBlock) {
+#ifdef TD_REFACTOR_3
   SBlockData *pBlockData = pReadh->pBlkData;
 
   for (int i = 0, j = 0; i < numOfCols;) {
     if (j >= pBlockData->numOfCols) {
       pStatis[i].numOfNull = -1;
-      i++;
+      ++i;
       continue;
     }
 
@@ -392,15 +438,45 @@ void tsdbGetBlockStatis(SReadH *pReadh, SDataStatis *pStatis, int numOfCols) {
       pStatis[i].maxIndex = pBlockData->cols[j].maxIndex;
       pStatis[i].minIndex = pBlockData->cols[j].minIndex;
       pStatis[i].numOfNull = pBlockData->cols[j].numOfNull;
-      i++;
-      j++;
+      ++i;
+      ++j;
     } else if (pStatis[i].colId < pBlockData->cols[j].colId) {
       pStatis[i].numOfNull = -1;
-      i++;
+      ++i;
     } else {
-      j++;
+      ++j;
     }
   }
+#else
+  if (pBlock->aggrStat) {
+    SAggrBlkData *pAggrBlkData = pReadh->pAggrBlkData;
+
+    for (int i = 0, j = 0; i < numOfCols;) {
+      if (j >= pBlock->numOfCols) {
+        pStatis[i].numOfNull = -1;
+        ++i;
+        continue;
+      }
+      SAggrBlkCol *pAggrBlkCol = ((SAggrBlkCol *)(pAggrBlkData)) + j;
+      if (pStatis[i].colId == pAggrBlkCol->colId) {
+        pStatis[i].sum = pAggrBlkCol->sum;
+        pStatis[i].max = pAggrBlkCol->max;
+        pStatis[i].min = pAggrBlkCol->min;
+        pStatis[i].maxIndex = pAggrBlkCol->maxIndex;
+        pStatis[i].minIndex = pAggrBlkCol->minIndex;
+        pStatis[i].numOfNull = pAggrBlkCol->numOfNull;
+        ++i;
+        ++j;
+      } else if (pStatis[i].colId < pAggrBlkCol->colId) {
+        pStatis[i].numOfNull = -1;
+        ++i;
+      } else {
+        ++j;
+      }
+    }
+  }
+
+#endif
 }
 
 static void tsdbResetReadTable(SReadH *pReadh) {
@@ -449,7 +525,7 @@ static int tsdbLoadBlockDataImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *pDat
     return -1;
   }
 
-  int32_t tsize = TSDB_BLOCK_STATIS_SIZE(pBlock->numOfCols);
+  int32_t tsize = (int32_t)tsdbBlockStatisSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer);
   if (!taosCheckChecksumWhole((uint8_t *)TSDB_READ_BUF(pReadh), tsize)) {
     terrno = TSDB_CODE_TDB_FILE_CORRUPTED;
     tsdbError("vgId:%d block statis part in file %s is corrupted since wrong checksum, offset:%" PRId64 " len :%d",
@@ -592,7 +668,7 @@ static int tsdbLoadBlockDataColsImpl(SReadH *pReadh, SBlock *pBlock, SDataCols *
   tdResetDataCols(pDataCols);
 
   // If only load timestamp column, no need to load SBlockData part
-  if (numOfColIds > 1 && tsdbLoadBlockStatis(pReadh, pBlock) < 0) return -1;
+  if (numOfColIds > 1 && tsdbLoadBlockOffset(pReadh, pBlock) < 0) return -1;
 
   pDataCols->numOfRows = pBlock->numOfRows;
 
@@ -686,7 +762,8 @@ static int tsdbLoadColData(SReadH *pReadh, SDFile *pDFile, SBlock *pBlock, SBloc
   if (tsdbMakeRoom((void **)(&TSDB_READ_BUF(pReadh)), pBlockCol->len) < 0) return -1;
   if (tsdbMakeRoom((void **)(&TSDB_READ_COMP_BUF(pReadh)), tsize) < 0) return -1;
 
-  int64_t offset = pBlock->offset + TSDB_BLOCK_STATIS_SIZE(pBlock->numOfCols) + tsdbGetBlockColOffset(pBlockCol);
+  int64_t offset = pBlock->offset + tsdbBlockStatisSize(pBlock->numOfCols, (uint32_t)pBlock->blkVer) +
+                   tsdbGetBlockColOffset(pBlockCol);
   if (tsdbSeekDFile(pDFile, offset, SEEK_SET) < 0) {
     tsdbError("vgId:%d failed to load block column data while seek file %s to offset %" PRId64 " since %s",
               TSDB_READ_REPO_ID(pReadh), TSDB_FILE_FULL_NAME(pDFile), offset, tstrerror(terrno));
diff --git a/source/libs/CMakeLists.txt b/source/libs/CMakeLists.txt
index e07e46948f..78625d1eed 100644
--- a/source/libs/CMakeLists.txt
+++ b/source/libs/CMakeLists.txt
@@ -14,5 +14,6 @@ add_subdirectory(function)
 add_subdirectory(qcom)
 add_subdirectory(qworker)
 add_subdirectory(tfs)
+add_subdirectory(monitor)
 add_subdirectory(nodes)
 add_subdirectory(scalar)
diff --git a/source/libs/cache/CMakeLists.txt b/source/libs/cache/CMakeLists.txt
index 5ba59ef160..c99b5602ad 100644
--- a/source/libs/cache/CMakeLists.txt
+++ b/source/libs/cache/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src CACHE_SRC)
-add_library(cache ${CACHE_SRC})
+add_library(cache STATIC ${CACHE_SRC})
 target_include_directories(
     cache
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/cache"
diff --git a/source/libs/catalog/CMakeLists.txt b/source/libs/catalog/CMakeLists.txt
index bb9ed686a7..09cd252a89 100644
--- a/source/libs/catalog/CMakeLists.txt
+++ b/source/libs/catalog/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src CATALOG_SRC)
-add_library(catalog ${CATALOG_SRC})
+add_library(catalog STATIC ${CATALOG_SRC})
 target_include_directories(
     catalog
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/catalog"
diff --git a/source/libs/function/CMakeLists.txt b/source/libs/function/CMakeLists.txt
index 9f700dbb3c..a10a542b6b 100644
--- a/source/libs/function/CMakeLists.txt
+++ b/source/libs/function/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src FUNCTION_SRC)
-add_library(function ${FUNCTION_SRC})
+add_library(function STATIC ${FUNCTION_SRC})
 target_include_directories(
     function
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/function"
diff --git a/source/libs/index/CMakeLists.txt b/source/libs/index/CMakeLists.txt
index 50e76abd3f..047fc555a0 100644
--- a/source/libs/index/CMakeLists.txt
+++ b/source/libs/index/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src INDEX_SRC)
-add_library(index ${INDEX_SRC})
+add_library(index STATIC ${INDEX_SRC})
 target_include_directories(
     index
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/index"
diff --git a/source/libs/monitor/CMakeLists.txt b/source/libs/monitor/CMakeLists.txt
new file mode 100644
index 0000000000..309d63691c
--- /dev/null
+++ b/source/libs/monitor/CMakeLists.txt
@@ -0,0 +1,13 @@
+aux_source_directory(src MONITOR_SRC)
+add_library(monitor STATIC ${MONITOR_SRC})
+target_include_directories(
+  monitor
+  PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/monitor"
+  PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/inc"
+)
+
+target_link_libraries(monitor os util common)
+
+if(${BUILD_TEST})
+    add_subdirectory(test)
+endif(${BUILD_TEST})
\ No newline at end of file
diff --git a/source/libs/monitor/inc/monInt.h b/source/libs/monitor/inc/monInt.h
new file mode 100644
index 0000000000..61f9980e4e
--- /dev/null
+++ b/source/libs/monitor/inc/monInt.h
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TD_MONITOR_INT_H_
+#define _TD_MONITOR_INT_H_
+
+#include "monitor.h"
+
+#include "tarray.h"
+#include "tlockfree.h"
+#include "tjson.h"
+
+typedef struct {
+  SRWLatch    lock;
+  SArray     *logs;  // array of SMonLogItem
+  int32_t     maxLogs;
+  const char *server;
+  uint16_t    port;
+} SMonitor;
+
+typedef struct SMonInfo {
+  SArray *logs;  // array of SMonLogItem
+  SJson  *pJson;
+} SMonInfo;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_MONITOR_INT_H_*/
diff --git a/source/libs/monitor/src/monitor.c b/source/libs/monitor/src/monitor.c
new file mode 100644
index 0000000000..811ee40dc8
--- /dev/null
+++ b/source/libs/monitor/src/monitor.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define _DEFAULT_SOURCE
+#include "monInt.h"
+#include "taoserror.h"
+#include "thttp.h"
+#include "tlog.h"
+#include "ttime.h"
+
+static SMonitor tsMonitor = {0};
+
+int32_t monInit(const SMonCfg *pCfg) {
+  tsMonitor.logs = taosArrayInit(16, sizeof(SMonInfo));
+  if (tsMonitor.logs == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    return -1;
+  }
+
+  tsMonitor.maxLogs = pCfg->maxLogs;
+  tsMonitor.server = pCfg->server;
+  tsMonitor.port = pCfg->port;
+  taosInitRWLatch(&tsMonitor.lock);
+  return 0;
+}
+
+void monCleanup() {
+  taosArrayDestroy(tsMonitor.logs);
+  tsMonitor.logs = NULL;
+}
+
+void monAddLogItem(SMonLogItem *pItem) {
+  taosWLockLatch(&tsMonitor.lock);
+  int32_t size = taosArrayGetSize(tsMonitor.logs);
+  if (size > tsMonitor.maxLogs) {
+    uInfo("too many logs for monitor");
+  } else {
+    taosArrayPush(tsMonitor.logs, pItem);
+  }
+  taosWUnLockLatch(&tsMonitor.lock);
+}
+
+SMonInfo *monCreateMonitorInfo() {
+  SMonInfo *pMonitor = calloc(1, sizeof(SMonInfo));
+  if (pMonitor == NULL) return NULL;
+
+  taosWLockLatch(&tsMonitor.lock);
+  pMonitor->logs = taosArrayDup(tsMonitor.logs);
+  taosArrayClear(tsMonitor.logs);
+  taosWUnLockLatch(&tsMonitor.lock);
+
+  pMonitor->pJson = tjsonCreateObject();
+  if (pMonitor->pJson == NULL || pMonitor->logs == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    monCleanupMonitorInfo(pMonitor);
+    return NULL;
+  }
+
+  return pMonitor;
+}
+
+void monCleanupMonitorInfo(SMonInfo *pMonitor) {
+  taosArrayDestroy(pMonitor->logs);
+  tjsonDelete(pMonitor->pJson);
+  free(pMonitor);
+}
+
+void monSendReport(SMonInfo *pMonitor) {
+  char *pCont = tjsonToString(pMonitor->pJson);
+  if (pCont != NULL) {
+    taosSendHttpReport(tsMonitor.server, tsMonitor.port, pCont, strlen(pCont));
+    free(pCont);
+  }
+}
+
+void monSetBasicInfo(SMonInfo *pMonitor, SMonBasicInfo *pInfo) {
+  SJson *pJson = pMonitor->pJson;
+  tjsonAddDoubleToObject(pJson, "dnode_id", pInfo->dnode_id);
+  tjsonAddStringToObject(pJson, "dnode_ep", pInfo->dnode_ep);
+
+  int64_t ms = taosGetTimestampMs();
+  char    buf[40] = {0};
+  taosFormatUtcTime(buf, sizeof(buf), ms, TSDB_TIME_PRECISION_MILLI);
+  tjsonAddStringToObject(pJson, "ts", buf);
+}
+
+void monSetClusterInfo(SMonInfo *pMonitor, SMonClusterInfo *pInfo) {
+
+}
+
+void monSetVgroupInfo(SMonInfo *pMonitor, SMonVgroupInfo *pInfo) {
+
+}
+
+void monSetGrantInfo(SMonInfo *pMonitor, SMonGrantInfo *pInfo) {
+
+}
+
+void monSetDnodeInfo(SMonInfo *pMonitor, SMonDnodeInfo *pInfo) {
+
+}
+
+void monSetDiskInfo(SMonInfo *pMonitor, SMonDiskInfo *pInfo) {
+    
+}
diff --git a/source/libs/monitor/test/CMakeLists.txt b/source/libs/monitor/test/CMakeLists.txt
new file mode 100644
index 0000000000..e3ab7e7337
--- /dev/null
+++ b/source/libs/monitor/test/CMakeLists.txt
@@ -0,0 +1,14 @@
+enable_testing()
+
+aux_source_directory(. MONITOR_TEST_SRC)
+add_executable(monitor_test ${MONITOR_TEST_SRC})
+target_link_libraries(
+  monitor_test
+  PUBLIC monitor
+  PUBLIC gtest_main
+)
+
+add_test(
+    NAME monitor_test
+    COMMAND monitor_test
+)
diff --git a/source/libs/monitor/test/monTest.cpp b/source/libs/monitor/test/monTest.cpp
new file mode 100644
index 0000000000..a1805d0c9c
--- /dev/null
+++ b/source/libs/monitor/test/monTest.cpp
@@ -0,0 +1,33 @@
+/**
+ * @file monTest.cpp
+ * @author slguan (slguan@taosdata.com)
+ * @brief monitor module tests
+ * @version 1.0
+ * @date 2022-03-05
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+
+#include <gtest/gtest.h>
+#include "os.h"
+
+#include "monitor.h"
+
+class MonitorTest : public ::testing::Test {
+ protected:
+  static void SetUpTestSuite() { root = "/tmp/monTest"; }
+  static void TearDownTestSuite() {}
+
+ public:
+  void SetUp() override {}
+  void TearDown() override {}
+
+  static const char *root;
+};
+
+const char *MonitorTest::root;
+
+TEST_F(MonitorTest, 01_Open_Close) {
+  
+}
diff --git a/source/libs/parser/CMakeLists.txt b/source/libs/parser/CMakeLists.txt
index 417c56aba1..5d02868657 100644
--- a/source/libs/parser/CMakeLists.txt
+++ b/source/libs/parser/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src PARSER_SRC)
-add_library(parser ${PARSER_SRC})
+add_library(parser STATIC ${PARSER_SRC})
 target_include_directories(
         parser
         PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/parser"
diff --git a/source/libs/planner/CMakeLists.txt b/source/libs/planner/CMakeLists.txt
index 14b4488e6a..db5d31f22b 100644
--- a/source/libs/planner/CMakeLists.txt
+++ b/source/libs/planner/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src PLANNER_SRC)
-add_library(planner ${PLANNER_SRC})
+add_library(planner STATIC ${PLANNER_SRC})
 target_include_directories(
     planner
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/planner"
diff --git a/source/libs/qcom/CMakeLists.txt b/source/libs/qcom/CMakeLists.txt
index c63e54fb9b..a9bf0f5594 100644
--- a/source/libs/qcom/CMakeLists.txt
+++ b/source/libs/qcom/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src QUERY_SRC)
-add_library(qcom ${QUERY_SRC})
+add_library(qcom STATIC ${QUERY_SRC})
 target_include_directories(
     qcom
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/qcom"
diff --git a/source/libs/scheduler/CMakeLists.txt b/source/libs/scheduler/CMakeLists.txt
index 1b4aee3ccf..862ae7ccae 100644
--- a/source/libs/scheduler/CMakeLists.txt
+++ b/source/libs/scheduler/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src SCHEDULER_SRC)
-add_library(scheduler ${SCHEDULER_SRC})
+add_library(scheduler STATIC ${SCHEDULER_SRC})
 
 target_include_directories(
         scheduler
diff --git a/source/libs/sync/CMakeLists.txt b/source/libs/sync/CMakeLists.txt
index cb38d7e363..cb196acc02 100644
--- a/source/libs/sync/CMakeLists.txt
+++ b/source/libs/sync/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src SYNC_SRC)
-add_library(sync ${SYNC_SRC})
+add_library(sync STATIC ${SYNC_SRC})
 
 target_link_libraries(
     sync
diff --git a/source/libs/sync/inc/syncEnv.h b/source/libs/sync/inc/syncEnv.h
index f1c4327b69..7e60822a28 100644
--- a/source/libs/sync/inc/syncEnv.h
+++ b/source/libs/sync/inc/syncEnv.h
@@ -26,19 +26,26 @@ extern "C" {
 #include "syncInt.h"
 #include "taosdef.h"
 #include "trpc.h"
+#include "ttimer.h"
+
+#define TIMER_MAX_MS 0x7FFFFFFF
 
 typedef struct SSyncEnv {
-  void *pTimer;
-  void *pTimerManager;
+  tmr_h pEnvTickTimer;
+  tmr_h pTimerManager;
+  char  name[128];
+
 } SSyncEnv;
 
+extern SSyncEnv* gSyncEnv;
+
 int32_t syncEnvStart();
 
 int32_t syncEnvStop();
 
-static int32_t doSyncEnvStart(SSyncEnv *pSyncEnv);
+tmr_h syncEnvStartTimer(TAOS_TMR_CALLBACK fp, int mseconds, void* param);
 
-static int32_t doSyncEnvStop(SSyncEnv *pSyncEnv);
+void syncEnvStopTimer(tmr_h* pTimer);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncIO.h b/source/libs/sync/inc/syncIO.h
index 4b788efd79..238948b403 100644
--- a/source/libs/sync/inc/syncIO.h
+++ b/source/libs/sync/inc/syncIO.h
@@ -30,42 +30,37 @@ extern "C" {
 #include "trpc.h"
 
 typedef struct SSyncIO {
-  void *      serverRpc;
-  void *      clientRpc;
   STaosQueue *pMsgQ;
   STaosQset * pQset;
-  pthread_t   tid;
-  int8_t      isStart;
+  pthread_t   consumerTid;
 
-  SEpSet epSet;
+  void * serverRpc;
+  void * clientRpc;
+  SEpSet myAddr;
 
-  void *syncTimer;
-  void *syncTimerManager;
-
-  int32_t (*start)(struct SSyncIO *ths);
-  int32_t (*stop)(struct SSyncIO *ths);
-  int32_t (*ping)(struct SSyncIO *ths);
-
-  int32_t (*onMsg)(struct SSyncIO *ths, void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
-  int32_t (*destroy)(struct SSyncIO *ths);
+  void *ioTimerTickQ;
+  void *ioTimerTickPing;
+  void *ioTimerManager;
 
   void *pSyncNode;
-  int32_t (*FpOnPing)(struct SSyncNode *ths, SyncPing *pMsg);
+  int32_t (*FpOnSyncPing)(SSyncNode *pSyncNode, SyncPing *pMsg);
+  int32_t (*FpOnSyncPingReply)(SSyncNode *pSyncNode, SyncPingReply *pMsg);
+  int32_t (*FpOnSyncRequestVote)(SSyncNode *pSyncNode, SyncRequestVote *pMsg);
+  int32_t (*FpOnSyncRequestVoteReply)(SSyncNode *pSyncNode, SyncRequestVoteReply *pMsg);
+  int32_t (*FpOnSyncAppendEntries)(SSyncNode *pSyncNode, SyncAppendEntries *pMsg);
+  int32_t (*FpOnSyncAppendEntriesReply)(SSyncNode *pSyncNode, SyncAppendEntriesReply *pMsg);
+
+  int8_t isStart;
 
 } SSyncIO;
 
 extern SSyncIO *gSyncIO;
 
-int32_t  syncIOStart();
-int32_t  syncIOStop();
-int32_t  syncIOSendMsg(void *handle, const SEpSet *pEpSet, SRpcMsg *pMsg);
-SSyncIO *syncIOCreate();
-
-static int32_t doSyncIOStart(SSyncIO *io);
-static int32_t doSyncIOStop(SSyncIO *io);
-static int32_t doSyncIOPing(SSyncIO *io);
-static int32_t doSyncIOOnMsg(struct SSyncIO *io, void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
-static int32_t doSyncIODestroy(SSyncIO *io);
+int32_t syncIOStart(char *host, uint16_t port);
+int32_t syncIOStop();
+int32_t syncIOSendMsg(void *clientRpc, const SEpSet *pEpSet, SRpcMsg *pMsg);
+int32_t syncIOTickQ();
+int32_t syncIOTickPing();
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncInt.h b/source/libs/sync/inc/syncInt.h
index ad8484662a..0901330488 100644
--- a/source/libs/sync/inc/syncInt.h
+++ b/source/libs/sync/inc/syncInt.h
@@ -26,6 +26,7 @@ extern "C" {
 #include "sync.h"
 #include "taosdef.h"
 #include "tlog.h"
+#include "ttimer.h"
 
 extern int32_t sDebugFlag;
 
@@ -47,23 +48,23 @@ extern int32_t sDebugFlag;
       taosPrintLog("SYN WARN ", sDebugFlag, __VA_ARGS__); \
     }                                                     \
   }
-#define sInfo(...)                                   \
-  {                                                  \
-    if (sDebugFlag & DEBUG_INFO) {                   \
-      taosPrintLog("SYN ", sDebugFlag, __VA_ARGS__); \
-    }                                                \
+#define sInfo(...)                                        \
+  {                                                       \
+    if (sDebugFlag & DEBUG_INFO) {                        \
+      taosPrintLog("SYN INFO ", sDebugFlag, __VA_ARGS__); \
+    }                                                     \
   }
-#define sDebug(...)                                  \
-  {                                                  \
-    if (sDebugFlag & DEBUG_DEBUG) {                  \
-      taosPrintLog("SYN ", sDebugFlag, __VA_ARGS__); \
-    }                                                \
+#define sDebug(...)                                        \
+  {                                                        \
+    if (sDebugFlag & DEBUG_DEBUG) {                        \
+      taosPrintLog("SYN DEBUG ", sDebugFlag, __VA_ARGS__); \
+    }                                                      \
   }
-#define sTrace(...)                                  \
-  {                                                  \
-    if (sDebugFlag & DEBUG_TRACE) {                  \
-      taosPrintLog("SYN ", sDebugFlag, __VA_ARGS__); \
-    }                                                \
+#define sTrace(...)                                        \
+  {                                                        \
+    if (sDebugFlag & DEBUG_TRACE) {                        \
+      taosPrintLog("SYN TRACE ", sDebugFlag, __VA_ARGS__); \
+    }                                                      \
   }
 
 struct SRaft;
@@ -87,35 +88,64 @@ typedef struct SyncAppendEntries SyncAppendEntries;
 struct SyncAppendEntriesReply;
 typedef struct SyncAppendEntriesReply SyncAppendEntriesReply;
 
-typedef struct SSyncNode {
-  int8_t replica;
-  int8_t quorum;
+struct SSyncEnv;
+typedef struct SSyncEnv SSyncEnv;
 
+typedef struct SRaftId {
+  SyncNodeId  addr;  // typedef uint64_t SyncNodeId;
+  SyncGroupId vgId;  // typedef int32_t  SyncGroupId;
+} SRaftId;
+
+typedef struct SSyncNode {
   SyncGroupId vgId;
   SSyncCfg    syncCfg;
   char        path[TSDB_FILENAME_LEN];
+  SSyncFSM*   pFsm;
 
-  SRaft* pRaft;
+  // passed from outside
+  void* rpcClient;
+  int32_t (*FpSendMsg)(void* rpcClient, const SEpSet* pEpSet, SRpcMsg* pMsg);
 
-  int32_t (*FpPing)(struct SSyncNode* ths, const SyncPing* pMsg);
+  int32_t refCount;
+  int64_t rid;
 
-  int32_t (*FpOnPing)(struct SSyncNode* ths, SyncPing* pMsg);
+  SNodeInfo me;
+  SNodeInfo peers[TSDB_MAX_REPLICA];
+  int32_t   peersNum;
 
-  int32_t (*FpOnPingReply)(struct SSyncNode* ths, SyncPingReply* pMsg);
+  ESyncRole role;
+  SRaftId   raftId;
 
-  int32_t (*FpRequestVote)(struct SSyncNode* ths, const SyncRequestVote* pMsg);
+  tmr_h             pPingTimer;
+  int32_t           pingTimerMS;
+  uint8_t           pingTimerStart;
+  TAOS_TMR_CALLBACK FpPingTimer;  // Timer Fp
+  uint64_t          pingTimerCounter;
 
-  int32_t (*FpOnRequestVote)(struct SSyncNode* ths, SyncRequestVote* pMsg);
+  tmr_h             pElectTimer;
+  int32_t           electTimerMS;
+  uint8_t           electTimerStart;
+  TAOS_TMR_CALLBACK FpElectTimer;  // Timer Fp
+  uint64_t          electTimerCounter;
 
-  int32_t (*FpOnRequestVoteReply)(struct SSyncNode* ths, SyncRequestVoteReply* pMsg);
+  tmr_h             pHeartbeatTimer;
+  int32_t           heartbeatTimerMS;
+  uint8_t           heartbeatTimerStart;
+  TAOS_TMR_CALLBACK FpHeartbeatTimer;  // Timer Fp
+  uint64_t          heartbeatTimerCounter;
 
-  int32_t (*FpAppendEntries)(struct SSyncNode* ths, const SyncAppendEntries* pMsg);
+  // callback
+  int32_t (*FpOnPing)(SSyncNode* ths, SyncPing* pMsg);
 
-  int32_t (*FpOnAppendEntries)(struct SSyncNode* ths, SyncAppendEntries* pMsg);
+  int32_t (*FpOnPingReply)(SSyncNode* ths, SyncPingReply* pMsg);
 
-  int32_t (*FpOnAppendEntriesReply)(struct SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+  int32_t (*FpOnRequestVote)(SSyncNode* ths, SyncRequestVote* pMsg);
 
-  int32_t (*FpSendMsg)(void* handle, const SEpSet* pEpSet, SRpcMsg* pMsg);
+  int32_t (*FpOnRequestVoteReply)(SSyncNode* ths, SyncRequestVoteReply* pMsg);
+
+  int32_t (*FpOnAppendEntries)(SSyncNode* ths, SyncAppendEntries* pMsg);
+
+  int32_t (*FpOnAppendEntriesReply)(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
 
 } SSyncNode;
 
@@ -123,23 +153,15 @@ SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo);
 
 void syncNodeClose(SSyncNode* pSyncNode);
 
-static int32_t doSyncNodePing(struct SSyncNode* ths, const SyncPing* pMsg);
+void syncNodePingAll(SSyncNode* pSyncNode);
 
-static int32_t onSyncNodePing(struct SSyncNode* ths, SyncPing* pMsg);
+void syncNodePingPeers(SSyncNode* pSyncNode);
 
-static int32_t onSyncNodePingReply(struct SSyncNode* ths, SyncPingReply* pMsg);
+void syncNodePingSelf(SSyncNode* pSyncNode);
 
-static int32_t doSyncNodeRequestVote(struct SSyncNode* ths, const SyncRequestVote* pMsg);
+int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode);
 
-static int32_t onSyncNodeRequestVote(struct SSyncNode* ths, SyncRequestVote* pMsg);
-
-static int32_t onSyncNodeRequestVoteReply(struct SSyncNode* ths, SyncRequestVoteReply* pMsg);
-
-static int32_t doSyncNodeAppendEntries(struct SSyncNode* ths, const SyncAppendEntries* pMsg);
-
-static int32_t onSyncNodeAppendEntries(struct SSyncNode* ths, SyncAppendEntries* pMsg);
-
-static int32_t onSyncNodeAppendEntriesReply(struct SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode);
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncMessage.h b/source/libs/sync/inc/syncMessage.h
index 2ee5e0109c..be53559e8a 100644
--- a/source/libs/sync/inc/syncMessage.h
+++ b/source/libs/sync/inc/syncMessage.h
@@ -23,13 +23,15 @@ extern "C" {
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include "cJSON.h"
 #include "sync.h"
 #include "syncRaftEntry.h"
 #include "taosdef.h"
 
+// encode as uint64
 typedef enum ESyncMessageType {
-  SYNC_PING = 0,
-  SYNC_PING_REPLY,
+  SYNC_PING = 101,
+  SYNC_PING_REPLY = 103,
   SYNC_CLIENT_REQUEST,
   SYNC_CLIENT_REQUEST_REPLY,
   SYNC_REQUEST_VOTE,
@@ -38,29 +40,86 @@ typedef enum ESyncMessageType {
   SYNC_APPEND_ENTRIES_REPLY,
 } ESyncMessageType;
 
+/*
+typedef struct SRaftId {
+  SyncNodeId  addr;  // typedef uint64_t SyncNodeId;
+  SyncGroupId vgId;  // typedef int32_t  SyncGroupId;
+} SRaftId;
+*/
+
 typedef struct SyncPing {
-  ESyncMessageType   msgType;
-  const SSyncBuffer *pData;
-} SyncPing, RaftPing;
+  uint32_t bytes;
+  uint32_t msgType;
+  SRaftId  srcId;
+  SRaftId  destId;
+  uint32_t dataLen;
+  char     data[];
+} SyncPing;
+
+#define SYNC_PING_FIX_LEN (sizeof(uint32_t) + sizeof(uint32_t) + sizeof(SRaftId) + sizeof(SRaftId) + sizeof(uint32_t))
+
+SyncPing* syncPingBuild(uint32_t dataLen);
+
+void syncPingDestroy(SyncPing* pMsg);
+
+void syncPingSerialize(const SyncPing* pMsg, char* buf, uint32_t bufLen);
+
+void syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg);
+
+void syncPing2RpcMsg(const SyncPing* pMsg, SRpcMsg* pRpcMsg);
+
+void syncPingFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPing* pMsg);
+
+cJSON* syncPing2Json(const SyncPing* pMsg);
+
+SyncPing* syncPingBuild2(const SRaftId* srcId, const SRaftId* destId, const char* str);
+
+SyncPing* syncPingBuild3(const SRaftId* srcId, const SRaftId* destId);
 
 typedef struct SyncPingReply {
-  ESyncMessageType   msgType;
-  const SSyncBuffer *pData;
-} SyncPingReply, RaftPingReply;
+  uint32_t bytes;
+  uint32_t msgType;
+  SRaftId  srcId;
+  SRaftId  destId;
+  uint32_t dataLen;
+  char     data[];
+} SyncPingReply;
+
+#define SYNC_PING_REPLY_FIX_LEN \
+  (sizeof(uint32_t) + sizeof(uint32_t) + sizeof(SRaftId) + sizeof(SRaftId) + sizeof(uint32_t))
+
+SyncPingReply* syncPingReplyBuild(uint32_t dataLen);
+
+void syncPingReplyDestroy(SyncPingReply* pMsg);
+
+void syncPingReplySerialize(const SyncPingReply* pMsg, char* buf, uint32_t bufLen);
+
+void syncPingReplyDeserialize(const char* buf, uint32_t len, SyncPingReply* pMsg);
+
+void syncPingReply2RpcMsg(const SyncPingReply* pMsg, SRpcMsg* pRpcMsg);
+
+void syncPingReplyFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPingReply* pMsg);
+
+cJSON* syncPingReply2Json(const SyncPingReply* pMsg);
+
+SyncPingReply* syncPingReplyBuild2(const SRaftId* srcId, const SRaftId* destId, const char* str);
+
+SyncPingReply* syncPingReplyBuild3(const SRaftId* srcId, const SRaftId* destId);
 
 typedef struct SyncClientRequest {
-  ESyncMessageType   msgType;
-  const SSyncBuffer *pData;
-  int64_t            seqNum;
-  bool               isWeak;
-} SyncClientRequest, RaftClientRequest;
+  ESyncMessageType msgType;
+  char*            data;
+  uint32_t         dataLen;
+  int64_t          seqNum;
+  bool             isWeak;
+} SyncClientRequest;
 
 typedef struct SyncClientRequestReply {
-  ESyncMessageType   msgType;
-  int32_t            errCode;
-  const SSyncBuffer *pErrMsg;
-  const SSyncBuffer *pLeaderHint;
-} SyncClientRequestReply, RaftClientRequestReply;
+  ESyncMessageType msgType;
+  int32_t          errCode;
+  SSyncBuffer*     pErrMsg;
+  SSyncBuffer*     pLeaderHint;
+} SyncClientRequestReply;
 
 typedef struct SyncRequestVote {
   ESyncMessageType msgType;
@@ -69,7 +128,7 @@ typedef struct SyncRequestVote {
   SyncGroupId      vgId;
   SyncIndex        lastLogIndex;
   SyncTerm         lastLogTerm;
-} SyncRequestVote, RaftRequestVote;
+} SyncRequestVote;
 
 typedef struct SyncRequestVoteReply {
   ESyncMessageType msgType;
@@ -77,7 +136,7 @@ typedef struct SyncRequestVoteReply {
   SyncNodeId       nodeId;
   SyncGroupId      vgId;
   bool             voteGranted;
-} SyncRequestVoteReply, RaftRequestVoteReply;
+} SyncRequestVoteReply;
 
 typedef struct SyncAppendEntries {
   ESyncMessageType msgType;
@@ -86,9 +145,9 @@ typedef struct SyncAppendEntries {
   SyncIndex        prevLogIndex;
   SyncTerm         prevLogTerm;
   int32_t          entryCount;
-  SSyncRaftEntry * logEntries;
+  SSyncRaftEntry*  logEntries;
   SyncIndex        commitIndex;
-} SyncAppendEntries, RaftAppendEntries;
+} SyncAppendEntries;
 
 typedef struct SyncAppendEntriesReply {
   ESyncMessageType msgType;
@@ -96,7 +155,7 @@ typedef struct SyncAppendEntriesReply {
   SyncNodeId       nodeId;
   bool             success;
   SyncIndex        matchIndex;
-} SyncAppendEntriesReply, RaftAppendEntriesReply;
+} SyncAppendEntriesReply;
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/sync/inc/syncRaft.h b/source/libs/sync/inc/syncRaft.h
index a247a29fc4..bc5cf26a4c 100644
--- a/source/libs/sync/inc/syncRaft.h
+++ b/source/libs/sync/inc/syncRaft.h
@@ -27,6 +27,8 @@ extern "C" {
 #include "syncMessage.h"
 #include "taosdef.h"
 
+#if 0
+
 typedef struct SRaftId {
   SyncNodeId  addr;
   SyncGroupId vgId;
@@ -82,6 +84,8 @@ int32_t raftPropose(SRaft* pRaft, const SSyncBuffer* pBuf, bool isWeak);
 
 static int raftSendMsg(SRaftId destRaftId, const void* pMsg, const SRaft* pRaft);
 
+#endif
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/sync/inc/syncRaftStore.h b/source/libs/sync/inc/syncRaftStore.h
index 0fdbd7a150..c480486ff0 100644
--- a/source/libs/sync/inc/syncRaftStore.h
+++ b/source/libs/sync/inc/syncRaftStore.h
@@ -34,8 +34,9 @@ extern "C" {
 typedef struct SRaftStore {
   SyncTerm currentTerm;
   SRaftId  voteFor;
-  //FileFd   fd;
-  char     path[RAFT_STORE_PATH_LEN];
+  // FileFd   fd;
+  TdFilePtr pFile;
+  char      path[RAFT_STORE_PATH_LEN];
 } SRaftStore;
 
 SRaftStore *raftStoreOpen(const char *path);
diff --git a/source/libs/sync/inc/syncUtil.h b/source/libs/sync/inc/syncUtil.h
new file mode 100644
index 0000000000..93d2c12525
--- /dev/null
+++ b/source/libs/sync/inc/syncUtil.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TD_LIBS_SYNC_UTIL_H
+#define _TD_LIBS_SYNC_UTIL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "syncInt.h"
+#include "syncMessage.h"
+#include "taosdef.h"
+
+// ---- encode / decode
+
+uint64_t syncUtilAddr2U64(const char* host, uint16_t port);
+
+void syncUtilU642Addr(uint64_t u64, char* host, size_t len, uint16_t* port);
+
+void syncUtilnodeInfo2EpSet(const SNodeInfo* pNodeInfo, SEpSet* pEpSet);
+
+void syncUtilraftId2EpSet(const SRaftId* raftId, SEpSet* pEpSet);
+
+void syncUtilnodeInfo2raftId(const SNodeInfo* pNodeInfo, SyncGroupId vgId, SRaftId* raftId);
+
+// ---- SSyncBuffer ----
+#if 0
+void syncUtilbufBuild(SSyncBuffer* syncBuf, size_t len);
+
+void syncUtilbufDestroy(SSyncBuffer* syncBuf);
+
+void syncUtilbufCopy(const SSyncBuffer* src, SSyncBuffer* dest);
+
+void syncUtilbufCopyDeep(const SSyncBuffer* src, SSyncBuffer* dest);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_LIBS_SYNC_UTIL_H*/
diff --git a/source/libs/sync/src/syncEnv.c b/source/libs/sync/src/syncEnv.c
index e71cf55cb1..a9cf035650 100644
--- a/source/libs/sync/src/syncEnv.c
+++ b/source/libs/sync/src/syncEnv.c
@@ -18,6 +18,14 @@
 
 SSyncEnv *gSyncEnv = NULL;
 
+// local function -----------------
+static void    syncEnvTick(void *param, void *tmrId);
+static int32_t doSyncEnvStart(SSyncEnv *pSyncEnv);
+static int32_t doSyncEnvStop(SSyncEnv *pSyncEnv);
+static tmr_h   doSyncEnvStartTimer(SSyncEnv *pSyncEnv, TAOS_TMR_CALLBACK fp, int mseconds, void *param);
+static void    doSyncEnvStopTimer(SSyncEnv *pSyncEnv, tmr_h *pTimer);
+// --------------------------------
+
 int32_t syncEnvStart() {
   int32_t ret;
   gSyncEnv = (SSyncEnv *)malloc(sizeof(SSyncEnv));
@@ -31,6 +39,40 @@ int32_t syncEnvStop() {
   return ret;
 }
 
-static int32_t doSyncEnvStart(SSyncEnv *pSyncEnv) { return 0; }
+tmr_h syncEnvStartTimer(TAOS_TMR_CALLBACK fp, int mseconds, void *param) {
+  return doSyncEnvStartTimer(gSyncEnv, fp, mseconds, param);
+}
 
-static int32_t doSyncEnvStop(SSyncEnv *pSyncEnv) { return 0; }
+void syncEnvStopTimer(tmr_h *pTimer) { doSyncEnvStopTimer(gSyncEnv, pTimer); }
+
+// local function -----------------
+static void syncEnvTick(void *param, void *tmrId) {
+  SSyncEnv *pSyncEnv = (SSyncEnv *)param;
+  sTrace("syncEnvTick ... name:%s ", pSyncEnv->name);
+
+  pSyncEnv->pEnvTickTimer = taosTmrStart(syncEnvTick, 1000, pSyncEnv, pSyncEnv->pTimerManager);
+}
+
+static int32_t doSyncEnvStart(SSyncEnv *pSyncEnv) {
+  snprintf(pSyncEnv->name, sizeof(pSyncEnv->name), "SyncEnv_%p", pSyncEnv);
+
+  // start tmr thread
+  pSyncEnv->pTimerManager = taosTmrInit(1000, 50, 10000, "SYNC-ENV");
+
+  // pSyncEnv->pEnvTickTimer = taosTmrStart(syncEnvTick, 1000, pSyncEnv, pSyncEnv->pTimerManager);
+
+  sTrace("SyncEnv start ok, name:%s", pSyncEnv->name);
+
+  return 0;
+}
+
+static int32_t doSyncEnvStop(SSyncEnv *pSyncEnv) {
+  taosTmrCleanUp(pSyncEnv->pTimerManager);
+  return 0;
+}
+
+static tmr_h doSyncEnvStartTimer(SSyncEnv *pSyncEnv, TAOS_TMR_CALLBACK fp, int mseconds, void *param) {
+  return taosTmrStart(fp, mseconds, pSyncEnv, pSyncEnv->pTimerManager);
+}
+
+static void doSyncEnvStopTimer(SSyncEnv *pSyncEnv, tmr_h *pTimer) {}
diff --git a/source/libs/sync/src/syncIO.c b/source/libs/sync/src/syncIO.c
index bb20d11e37..8d04b5bb26 100644
--- a/source/libs/sync/src/syncIO.c
+++ b/source/libs/sync/src/syncIO.c
@@ -22,118 +22,72 @@
 
 SSyncIO *gSyncIO = NULL;
 
-int32_t syncIOSendMsg(void *handle, const SEpSet *pEpSet, SRpcMsg *pMsg) { return 0; }
+// local function ------------
+static int32_t  syncIOStartInternal(SSyncIO *io);
+static int32_t  syncIOStopInternal(SSyncIO *io);
+static SSyncIO *syncIOCreate(char *host, uint16_t port);
+static int32_t  syncIODestroy(SSyncIO *io);
 
-int32_t syncIOStart() { return 0; }
+static void *syncIOConsumerFunc(void *param);
+static int   syncIOAuth(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey);
+static void  syncIOProcessRequest(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
+static void  syncIOProcessReply(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet);
 
-int32_t syncIOStop() { return 0; }
+static int32_t syncIOTickQInternal(SSyncIO *io);
+static void    syncIOTickQFunc(void *param, void *tmrId);
+static int32_t syncIOTickPingInternal(SSyncIO *io);
+static void    syncIOTickPingFunc(void *param, void *tmrId);
+// ----------------------------
 
-static void syncTick(void *param, void *tmrId) {
-  SSyncIO *io = (SSyncIO *)param;
-  sDebug("syncTick ... ");
-
-  SRpcMsg rpcMsg;
-  rpcMsg.pCont = rpcMallocCont(10);
-  snprintf(rpcMsg.pCont, 10, "TICK");
-  rpcMsg.contLen = 10;
-  rpcMsg.handle = NULL;
-  rpcMsg.msgType = 2;
-
-  SRpcMsg *pTemp;
-
-  pTemp = taosAllocateQitem(sizeof(SRpcMsg));
-  memcpy(pTemp, &rpcMsg, sizeof(SRpcMsg));
-
-  taosWriteQitem(io->pMsgQ, pTemp);
-
-  io->syncTimer = taosTmrStart(syncTick, 1000, io, io->syncTimerManager);
+// public function ------------
+int32_t syncIOSendMsg(void *clientRpc, const SEpSet *pEpSet, SRpcMsg *pMsg) {
+  sTrace(
+      "<--- syncIOSendMsg ---> clientRpc:%p, numOfEps:%d, inUse:%d, destAddr:%s-%u, pMsg->ahandle:%p, pMsg->handle:%p, "
+      "pMsg->msgType:%d, pMsg->contLen:%d",
+      clientRpc, pEpSet->numOfEps, pEpSet->inUse, pEpSet->eps[0].fqdn, pEpSet->eps[0].port, pMsg->ahandle, pMsg->handle,
+      pMsg->msgType, pMsg->contLen);
+  pMsg->handle = NULL;
+  rpcSendRequest(clientRpc, pEpSet, pMsg, NULL);
+  return 0;
 }
 
-void *syncConsumer(void *param) {
-  SSyncIO *io = param;
+int32_t syncIOStart(char *host, uint16_t port) {
+  gSyncIO = syncIOCreate(host, port);
+  assert(gSyncIO != NULL);
 
-  STaosQall *qall;
-  SRpcMsg *  pRpcMsg, rpcMsg;
-  int        type;
+  int32_t ret = syncIOStartInternal(gSyncIO);
+  assert(ret == 0);
 
-  qall = taosAllocateQall();
-
-  while (1) {
-    int numOfMsgs = taosReadAllQitemsFromQset(io->pQset, qall, NULL, NULL);
-    sDebug("%d sync-io msgs are received", numOfMsgs);
-    if (numOfMsgs <= 0) break;
-
-    for (int i = 0; i < numOfMsgs; ++i) {
-      taosGetQitem(qall, (void **)&pRpcMsg);
-      sDebug("sync-io recv type:%d msg:%s", pRpcMsg->msgType, (char *)(pRpcMsg->pCont));
-    }
-
-    taosResetQitems(qall);
-    for (int i = 0; i < numOfMsgs; ++i) {
-      taosGetQitem(qall, (void **)&pRpcMsg);
-      rpcFreeCont(pRpcMsg->pCont);
-
-      if (pRpcMsg->handle != NULL) {
-        int msgSize = 128;
-        memset(&rpcMsg, 0, sizeof(rpcMsg));
-        rpcMsg.pCont = rpcMallocCont(msgSize);
-        rpcMsg.contLen = msgSize;
-        rpcMsg.handle = pRpcMsg->handle;
-        rpcMsg.code = 0;
-        rpcSendResponse(&rpcMsg);
-      }
-
-      taosFreeQitem(pRpcMsg);
-    }
-  }
-
-  taosFreeQall(qall);
-  return NULL;
+  sTrace("syncIOStart ok, gSyncIO:%p gSyncIO->clientRpc:%p", gSyncIO, gSyncIO->clientRpc);
+  return 0;
 }
 
-static int retrieveAuthInfo(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey) {
-  // app shall retrieve the auth info based on meterID from DB or a data file
-  // demo code here only for simple demo
-  int ret = 0;
+int32_t syncIOStop() {
+  int32_t ret = syncIOStopInternal(gSyncIO);
+  assert(ret == 0);
+
+  ret = syncIODestroy(gSyncIO);
+  assert(ret == 0);
   return ret;
 }
 
-static void processResponse(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
-  sDebug("processResponse ... ");
-  rpcFreeCont(pMsg->pCont);
+int32_t syncIOTickQ() {
+  int32_t ret = syncIOTickQInternal(gSyncIO);
+  assert(ret == 0);
+  return ret;
 }
 
-static void processRequestMsg(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
-  SSyncIO *io = pParent;
-  SRpcMsg *pTemp;
-
-  pTemp = taosAllocateQitem(sizeof(SRpcMsg));
-  memcpy(pTemp, pMsg, sizeof(SRpcMsg));
-
-  sDebug("request is received, type:%d, contLen:%d, item:%p", pMsg->msgType, pMsg->contLen, pTemp);
-  taosWriteQitem(io->pMsgQ, pTemp);
+int32_t syncIOTickPing() {
+  int32_t ret = syncIOTickPingInternal(gSyncIO);
+  assert(ret == 0);
+  return ret;
 }
 
-SSyncIO *syncIOCreate() {
-  SSyncIO *io = (SSyncIO *)malloc(sizeof(SSyncIO));
-  memset(io, 0, sizeof(*io));
-
-  io->pMsgQ = taosOpenQueue();
-  io->pQset = taosOpenQset();
-  taosAddIntoQset(io->pQset, io->pMsgQ, NULL);
-
-  io->start = doSyncIOStart;
-  io->stop = doSyncIOStop;
-  io->ping = doSyncIOPing;
-  io->onMsg = doSyncIOOnMsg;
-  io->destroy = doSyncIODestroy;
-
-  return io;
-}
-
-static int32_t doSyncIOStart(SSyncIO *io) {
+// local function ------------
+static int32_t syncIOStartInternal(SSyncIO *io) {
   taosBlockSIGPIPE();
 
+  rpcInit();
   tsRpcForceTcp = 1;
 
   // cient rpc init
@@ -143,7 +97,7 @@ static int32_t doSyncIOStart(SSyncIO *io) {
     rpcInit.localPort = 0;
     rpcInit.label = "SYNC-IO-CLIENT";
     rpcInit.numOfThreads = 1;
-    rpcInit.cfp = processResponse;
+    rpcInit.cfp = syncIOProcessReply;
     rpcInit.sessions = 100;
     rpcInit.idleTime = 100;
     rpcInit.user = "sync-io";
@@ -163,13 +117,13 @@ static int32_t doSyncIOStart(SSyncIO *io) {
   {
     SRpcInit rpcInit;
     memset(&rpcInit, 0, sizeof(rpcInit));
-    rpcInit.localPort = 38000;
+    rpcInit.localPort = io->myAddr.eps[0].port;
     rpcInit.label = "SYNC-IO-SERVER";
     rpcInit.numOfThreads = 1;
-    rpcInit.cfp = processRequestMsg;
+    rpcInit.cfp = syncIOProcessRequest;
     rpcInit.sessions = 1000;
     rpcInit.idleTime = 2 * 1500;
-    rpcInit.afp = retrieveAuthInfo;
+    rpcInit.afp = syncIOAuth;
     rpcInit.parent = io;
     rpcInit.connType = TAOS_CONN_SERVER;
 
@@ -180,12 +134,9 @@ static int32_t doSyncIOStart(SSyncIO *io) {
     }
   }
 
-  io->epSet.inUse = 0;
-  addEpIntoEpSet(&io->epSet, "127.0.0.1", 38000);
-
   // start consumer thread
   {
-    if (pthread_create(&io->tid, NULL, syncConsumer, io) != 0) {
+    if (pthread_create(&io->consumerTid, NULL, syncIOConsumerFunc, io) != 0) {
       sError("failed to create sync consumer thread since %s", strerror(errno));
       terrno = TAOS_SYSTEM_ERROR(errno);
       return -1;
@@ -193,35 +144,32 @@ static int32_t doSyncIOStart(SSyncIO *io) {
   }
 
   // start tmr thread
-  io->syncTimerManager = taosTmrInit(1000, 50, 10000, "SYNC");
-  io->syncTimer = taosTmrStart(syncTick, 1000, io, io->syncTimerManager);
+  io->ioTimerManager = taosTmrInit(1000, 50, 10000, "SYNC");
 
   return 0;
 }
 
-static int32_t doSyncIOStop(SSyncIO *io) {
+static int32_t syncIOStopInternal(SSyncIO *io) {
   atomic_store_8(&io->isStart, 0);
-  pthread_join(io->tid, NULL);
+  pthread_join(io->consumerTid, NULL);
   return 0;
 }
 
-static int32_t doSyncIOPing(SSyncIO *io) {
-  SRpcMsg rpcMsg, rspMsg;
+static SSyncIO *syncIOCreate(char *host, uint16_t port) {
+  SSyncIO *io = (SSyncIO *)malloc(sizeof(SSyncIO));
+  memset(io, 0, sizeof(*io));
 
-  rpcMsg.pCont = rpcMallocCont(10);
-  snprintf(rpcMsg.pCont, 10, "ping");
-  rpcMsg.contLen = 10;
-  rpcMsg.handle = NULL;
-  rpcMsg.msgType = 1;
+  io->pMsgQ = taosOpenQueue();
+  io->pQset = taosOpenQset();
+  taosAddIntoQset(io->pQset, io->pMsgQ, NULL);
 
-  rpcSendRequest(io->clientRpc, &io->epSet, &rpcMsg, NULL);
+  io->myAddr.inUse = 0;
+  addEpIntoEpSet(&io->myAddr, host, port);
 
-  return 0;
+  return io;
 }
 
-static int32_t doSyncIOOnMsg(struct SSyncIO *io, void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) { return 0; }
-
-static int32_t doSyncIODestroy(SSyncIO *io) {
+static int32_t syncIODestroy(SSyncIO *io) {
   int8_t start = atomic_load_8(&io->isStart);
   assert(start == 0);
 
@@ -235,15 +183,149 @@ static int32_t doSyncIODestroy(SSyncIO *io) {
     io->clientRpc = NULL;
   }
 
-  if (io->pMsgQ != NULL) {
-    free(io->pMsgQ);
-    io->pMsgQ = NULL;
-  }
-
-  if (io->pQset != NULL) {
-    free(io->pQset);
-    io->pQset = NULL;
-  }
+  taosCloseQueue(io->pMsgQ);
+  taosCloseQset(io->pQset);
 
   return 0;
 }
+
+static void *syncIOConsumerFunc(void *param) {
+  SSyncIO *io = param;
+
+  STaosQall *qall;
+  SRpcMsg *  pRpcMsg, rpcMsg;
+  int        type;
+
+  qall = taosAllocateQall();
+
+  while (1) {
+    int numOfMsgs = taosReadAllQitemsFromQset(io->pQset, qall, NULL, NULL);
+    sTrace("syncIOConsumerFunc %d msgs are received", numOfMsgs);
+    if (numOfMsgs <= 0) break;
+
+    for (int i = 0; i < numOfMsgs; ++i) {
+      taosGetQitem(qall, (void **)&pRpcMsg);
+      sTrace("syncIOConsumerFunc get item from queue: msgType:%d contLen:%d msg:%s", pRpcMsg->msgType, pRpcMsg->contLen,
+             (char *)(pRpcMsg->pCont));
+
+      if (pRpcMsg->msgType == SYNC_PING) {
+        if (io->FpOnSyncPing != NULL) {
+          SyncPing *pSyncMsg;
+
+          SRpcMsg tmpRpcMsg;
+          memcpy(&tmpRpcMsg, pRpcMsg, sizeof(SRpcMsg));
+          pSyncMsg = syncPingBuild(tmpRpcMsg.contLen);
+
+          syncPingFromRpcMsg(pRpcMsg, pSyncMsg);
+
+          // memcpy(pSyncMsg, tmpRpcMsg.pCont, tmpRpcMsg.contLen);
+
+          io->FpOnSyncPing(io->pSyncNode, pSyncMsg);
+        }
+
+      } else if (pRpcMsg->msgType == SYNC_PING_REPLY) {
+        SyncPingReply *pSyncMsg = syncPingReplyBuild(pRpcMsg->contLen);
+        syncPingReplyFromRpcMsg(pRpcMsg, pSyncMsg);
+
+        if (io->FpOnSyncPingReply != NULL) {
+          io->FpOnSyncPingReply(io->pSyncNode, pSyncMsg);
+        }
+      } else {
+        ;
+      }
+    }
+
+    taosResetQitems(qall);
+    for (int i = 0; i < numOfMsgs; ++i) {
+      taosGetQitem(qall, (void **)&pRpcMsg);
+      rpcFreeCont(pRpcMsg->pCont);
+
+      if (pRpcMsg->handle != NULL) {
+        int msgSize = 128;
+        memset(&rpcMsg, 0, sizeof(rpcMsg));
+        rpcMsg.pCont = rpcMallocCont(msgSize);
+        rpcMsg.contLen = msgSize;
+        snprintf(rpcMsg.pCont, rpcMsg.contLen, "%s", "give a reply");
+        rpcMsg.handle = pRpcMsg->handle;
+        rpcMsg.code = 0;
+
+        sTrace("syncIOConsumerFunc rpcSendResponse ... msgType:%d contLen:%d", pRpcMsg->msgType, rpcMsg.contLen);
+        rpcSendResponse(&rpcMsg);
+      }
+
+      taosFreeQitem(pRpcMsg);
+    }
+  }
+
+  taosFreeQall(qall);
+  return NULL;
+}
+
+static int syncIOAuth(void *parent, char *meterId, char *spi, char *encrypt, char *secret, char *ckey) {
+  // app shall retrieve the auth info based on meterID from DB or a data file
+  // demo code here only for simple demo
+  int ret = 0;
+  return ret;
+}
+
+static void syncIOProcessRequest(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
+  sTrace("<-- syncIOProcessRequest --> type:%d, contLen:%d, cont:%s", pMsg->msgType, pMsg->contLen,
+         (char *)pMsg->pCont);
+
+  SSyncIO *io = pParent;
+  SRpcMsg *pTemp;
+
+  pTemp = taosAllocateQitem(sizeof(SRpcMsg));
+  memcpy(pTemp, pMsg, sizeof(SRpcMsg));
+
+  taosWriteQitem(io->pMsgQ, pTemp);
+}
+
+static void syncIOProcessReply(void *pParent, SRpcMsg *pMsg, SEpSet *pEpSet) {
+  sTrace("syncIOProcessReply: type:%d, contLen:%d msg:%s", pMsg->msgType, pMsg->contLen, (char *)pMsg->pCont);
+  rpcFreeCont(pMsg->pCont);
+}
+
+static int32_t syncIOTickQInternal(SSyncIO *io) {
+  io->ioTimerTickQ = taosTmrStart(syncIOTickQFunc, 1000, io, io->ioTimerManager);
+  return 0;
+}
+
+static void syncIOTickQFunc(void *param, void *tmrId) {
+  SSyncIO *io = (SSyncIO *)param;
+  sTrace("<-- syncIOTickQFunc -->");
+
+  SRpcMsg rpcMsg;
+  rpcMsg.contLen = 64;
+  rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);
+  snprintf(rpcMsg.pCont, rpcMsg.contLen, "%s", "syncIOTickQ");
+  rpcMsg.handle = NULL;
+  rpcMsg.msgType = 55;
+
+  SRpcMsg *pTemp;
+  pTemp = taosAllocateQitem(sizeof(SRpcMsg));
+  memcpy(pTemp, &rpcMsg, sizeof(SRpcMsg));
+
+  taosWriteQitem(io->pMsgQ, pTemp);
+  taosTmrReset(syncIOTickQFunc, 1000, io, io->ioTimerManager, &io->ioTimerTickQ);
+}
+
+static int32_t syncIOTickPingInternal(SSyncIO *io) {
+  io->ioTimerTickPing = taosTmrStart(syncIOTickPingFunc, 1000, io, io->ioTimerManager);
+  return 0;
+}
+
+static void syncIOTickPingFunc(void *param, void *tmrId) {
+  SSyncIO *io = (SSyncIO *)param;
+  sTrace("<-- syncIOTickPingFunc -->");
+
+  SRpcMsg rpcMsg;
+  rpcMsg.contLen = 64;
+  rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);
+  snprintf(rpcMsg.pCont, rpcMsg.contLen, "%s", "syncIOTickPing");
+  rpcMsg.handle = NULL;
+  rpcMsg.msgType = 77;
+
+  rpcSendRequest(io->clientRpc, &io->myAddr, &rpcMsg, NULL);
+  taosTmrReset(syncIOTickPingFunc, 1000, io, io->ioTimerManager, &io->ioTimerTickPing);
+}
\ No newline at end of file
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index bd2952505e..49fac038da 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -15,12 +15,36 @@
 
 #include <stdint.h>
 #include "sync.h"
+#include "syncEnv.h"
 #include "syncInt.h"
 #include "syncRaft.h"
+#include "syncUtil.h"
 
-int32_t syncInit() { return 0; }
+static int32_t tsNodeRefId = -1;
 
-void syncCleanUp() {}
+// ------ local funciton ---------
+static int32_t syncNodeSendMsgById(const SRaftId* destRaftId, SSyncNode* pSyncNode, SRpcMsg* pMsg);
+static int32_t syncNodeSendMsgByInfo(const SNodeInfo* nodeInfo, SSyncNode* pSyncNode, SRpcMsg* pMsg);
+static void    syncNodePingTimerCb(void* param, void* tmrId);
+
+static int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg);
+static int32_t syncNodeRequestVote(SSyncNode* ths, const SyncRequestVote* pMsg);
+static int32_t syncNodeAppendEntries(SSyncNode* ths, const SyncAppendEntries* pMsg);
+
+static int32_t syncNodeOnPingCb(SSyncNode* ths, SyncPing* pMsg);
+static int32_t syncNodeOnPingReplyCb(SSyncNode* ths, SyncPingReply* pMsg);
+static int32_t syncNodeOnRequestVoteCb(SSyncNode* ths, SyncRequestVote* pMsg);
+static int32_t syncNodeOnRequestVoteReplyCb(SSyncNode* ths, SyncRequestVoteReply* pMsg);
+static int32_t syncNodeOnAppendEntriesCb(SSyncNode* ths, SyncAppendEntries* pMsg);
+static int32_t syncNodeOnAppendEntriesReplyCb(SSyncNode* ths, SyncAppendEntriesReply* pMsg);
+// ---------------------------------
+
+int32_t syncInit() {
+  sTrace("syncInit ok");
+  return 0;
+}
+
+void syncCleanUp() { sTrace("syncCleanUp ok"); }
 
 int64_t syncStart(const SSyncInfo* pSyncInfo) {
   SSyncNode* pSyncNode = syncNodeOpen(pSyncInfo);
@@ -32,7 +56,9 @@ void syncStop(int64_t rid) {}
 
 int32_t syncReconfig(int64_t rid, const SSyncCfg* pSyncCfg) { return 0; }
 
-int32_t syncForwardToPeer(int64_t rid, const SSyncBuffer* pBuf, bool isWeak) { return 0; }
+// int32_t syncForwardToPeer(int64_t rid, const SSyncBuffer* pBuf, bool isWeak) { return 0; }
+
+int32_t syncForwardToPeer(int64_t rid, const SRpcMsg* pBuf, bool isWeak) { return 0; }
 
 ESyncState syncGetMyRole(int64_t rid) { return TAOS_SYNC_STATE_LEADER; }
 
@@ -41,69 +67,238 @@ void syncGetNodesRole(int64_t rid, SNodesRole* pNodeRole) {}
 SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo) {
   SSyncNode* pSyncNode = (SSyncNode*)malloc(sizeof(SSyncNode));
   assert(pSyncNode != NULL);
+  memset(pSyncNode, 0, sizeof(SSyncNode));
 
+  pSyncNode->vgId = pSyncInfo->vgId;
+  pSyncNode->syncCfg = pSyncInfo->syncCfg;
+  memcpy(pSyncNode->path, pSyncInfo->path, sizeof(pSyncNode->path));
+  pSyncNode->pFsm = pSyncInfo->pFsm;
+
+  pSyncNode->rpcClient = pSyncInfo->rpcClient;
   pSyncNode->FpSendMsg = pSyncInfo->FpSendMsg;
 
-  pSyncNode->FpPing = doSyncNodePing;
-  pSyncNode->FpOnPing = onSyncNodePing;
-  pSyncNode->FpOnPingReply = onSyncNodePingReply;
-  pSyncNode->FpRequestVote = doSyncNodeRequestVote;
-  pSyncNode->FpOnRequestVote = onSyncNodeRequestVote;
-  pSyncNode->FpOnRequestVoteReply = onSyncNodeRequestVoteReply;
-  pSyncNode->FpAppendEntries = doSyncNodeAppendEntries;
-  pSyncNode->FpOnAppendEntries = onSyncNodeAppendEntries;
-  pSyncNode->FpOnAppendEntriesReply = onSyncNodeAppendEntriesReply;
+  pSyncNode->me = pSyncInfo->syncCfg.nodeInfo[pSyncInfo->syncCfg.myIndex];
+  pSyncNode->peersNum = pSyncInfo->syncCfg.replicaNum - 1;
+
+  int j = 0;
+  for (int i = 0; i < pSyncInfo->syncCfg.replicaNum; ++i) {
+    if (i != pSyncInfo->syncCfg.myIndex) {
+      pSyncNode->peers[j] = pSyncInfo->syncCfg.nodeInfo[i];
+      j++;
+    }
+  }
+
+  pSyncNode->role = TAOS_SYNC_STATE_FOLLOWER;
+  syncUtilnodeInfo2raftId(&pSyncNode->me, pSyncNode->vgId, &pSyncNode->raftId);
+
+  pSyncNode->pPingTimer = NULL;
+  pSyncNode->pingTimerMS = 1000;
+  atomic_store_8(&pSyncNode->pingTimerStart, 0);
+  pSyncNode->FpPingTimer = syncNodePingTimerCb;
+  pSyncNode->pingTimerCounter = 0;
+
+  pSyncNode->FpOnPing = syncNodeOnPingCb;
+  pSyncNode->FpOnPingReply = syncNodeOnPingReplyCb;
+  pSyncNode->FpOnRequestVote = syncNodeOnRequestVoteCb;
+  pSyncNode->FpOnRequestVoteReply = syncNodeOnRequestVoteReplyCb;
+  pSyncNode->FpOnAppendEntries = syncNodeOnAppendEntriesCb;
+  pSyncNode->FpOnAppendEntriesReply = syncNodeOnAppendEntriesReplyCb;
 
   return pSyncNode;
 }
 
 void syncNodeClose(SSyncNode* pSyncNode) {
   assert(pSyncNode != NULL);
-  raftClose(pSyncNode->pRaft);
   free(pSyncNode);
 }
 
-static int32_t doSyncNodePing(struct SSyncNode* ths, const SyncPing* pMsg) {
-  int32_t ret = ths->pRaft->FpPing(ths->pRaft, pMsg);
+void syncNodePingAll(SSyncNode* pSyncNode) {
+  sTrace("syncNodePingAll pSyncNode:%p ", pSyncNode);
+  int32_t ret = 0;
+  for (int i = 0; i < pSyncNode->syncCfg.replicaNum; ++i) {
+    SRaftId destId;
+    syncUtilnodeInfo2raftId(&pSyncNode->syncCfg.nodeInfo[i], pSyncNode->vgId, &destId);
+    SyncPing* pMsg = syncPingBuild3(&pSyncNode->raftId, &destId);
+    ret = syncNodePing(pSyncNode, &destId, pMsg);
+    assert(ret == 0);
+    syncPingDestroy(pMsg);
+  }
+}
+
+void syncNodePingPeers(SSyncNode* pSyncNode) {
+  int32_t ret = 0;
+  for (int i = 0; i < pSyncNode->peersNum; ++i) {
+    SRaftId destId;
+    syncUtilnodeInfo2raftId(&pSyncNode->peers[i], pSyncNode->vgId, &destId);
+    SyncPing* pMsg = syncPingBuild3(&pSyncNode->raftId, &destId);
+    ret = syncNodePing(pSyncNode, &destId, pMsg);
+    assert(ret == 0);
+    syncPingDestroy(pMsg);
+  }
+}
+
+void syncNodePingSelf(SSyncNode* pSyncNode) {
+  int32_t   ret;
+  SyncPing* pMsg = syncPingBuild3(&pSyncNode->raftId, &pSyncNode->raftId);
+  ret = syncNodePing(pSyncNode, &pMsg->destId, pMsg);
+  assert(ret == 0);
+  syncPingDestroy(pMsg);
+}
+
+int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode) {
+  if (pSyncNode->pPingTimer == NULL) {
+    pSyncNode->pPingTimer =
+        taosTmrStart(pSyncNode->FpPingTimer, pSyncNode->pingTimerCounter, pSyncNode, gSyncEnv->pTimerManager);
+  } else {
+    taosTmrReset(pSyncNode->FpPingTimer, pSyncNode->pingTimerCounter, pSyncNode, gSyncEnv->pTimerManager,
+                 &pSyncNode->pPingTimer);
+  }
+
+  atomic_store_8(&pSyncNode->pingTimerStart, 1);
+  return 0;
+}
+
+int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode) {
+  atomic_store_8(&pSyncNode->pingTimerStart, 0);
+  pSyncNode->pingTimerCounter = TIMER_MAX_MS;
+  return 0;
+}
+
+// ------ local funciton ---------
+static int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg) {
+  sTrace("syncNodePing pSyncNode:%p ", pSyncNode);
+  int32_t ret = 0;
+
+  SRpcMsg rpcMsg;
+  syncPing2RpcMsg(pMsg, &rpcMsg);
+
+  /*
+    SRpcMsg rpcMsg;
+    rpcMsg.contLen = 64;
+    rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);
+    snprintf((char*)rpcMsg.pCont, rpcMsg.contLen, "%s", "xxxxxxxxxxxxxx");
+    rpcMsg.handle = NULL;
+    rpcMsg.msgType = 1;
+  */
+
+  syncNodeSendMsgById(destRaftId, pSyncNode, &rpcMsg);
+
+  {
+    cJSON* pJson = syncPing2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    sTrace("syncNodePing pMsg:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  {
+    SyncPing* pMsg2 = rpcMsg.pCont;
+    cJSON*    pJson = syncPing2Json(pMsg2);
+    char*     serialized = cJSON_Print(pJson);
+    sTrace("syncNodePing rpcMsg.pCont:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
   return ret;
 }
 
-static int32_t onSyncNodePing(struct SSyncNode* ths, SyncPing* pMsg) {
-  int32_t ret = ths->pRaft->FpOnPing(ths->pRaft, pMsg);
+static int32_t syncNodeRequestVote(SSyncNode* ths, const SyncRequestVote* pMsg) {
+  int32_t ret = 0;
   return ret;
 }
 
-static int32_t onSyncNodePingReply(struct SSyncNode* ths, SyncPingReply* pMsg) {
-  int32_t ret = ths->pRaft->FpOnPingReply(ths->pRaft, pMsg);
+static int32_t syncNodeAppendEntries(SSyncNode* ths, const SyncAppendEntries* pMsg) {
+  int32_t ret = 0;
   return ret;
 }
 
-static int32_t doSyncNodeRequestVote(struct SSyncNode* ths, const SyncRequestVote* pMsg) {
-  int32_t ret = ths->pRaft->FpRequestVote(ths->pRaft, pMsg);
+static int32_t syncNodeSendMsgById(const SRaftId* destRaftId, SSyncNode* pSyncNode, SRpcMsg* pMsg) {
+  sTrace("syncNodeSendMsgById pSyncNode:%p ", pSyncNode);
+  SEpSet epSet;
+  syncUtilraftId2EpSet(destRaftId, &epSet);
+  pSyncNode->FpSendMsg(pSyncNode->rpcClient, &epSet, pMsg);
+  return 0;
+}
+
+static int32_t syncNodeSendMsgByInfo(const SNodeInfo* nodeInfo, SSyncNode* pSyncNode, SRpcMsg* pMsg) {
+  SEpSet epSet;
+  syncUtilnodeInfo2EpSet(nodeInfo, &epSet);
+  pSyncNode->FpSendMsg(pSyncNode->rpcClient, &epSet, pMsg);
+  return 0;
+}
+
+static int32_t syncNodeOnPingCb(SSyncNode* ths, SyncPing* pMsg) {
+  int32_t ret = 0;
+  sTrace("<-- syncNodeOnPingCb -->");
+
+  {
+    cJSON* pJson = syncPing2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    sTrace("syncNodeOnPingCb syncNodePing pMsg:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  SyncPingReply* pMsgReply = syncPingReplyBuild3(&ths->raftId, &pMsg->srcId);
+  SRpcMsg        rpcMsg;
+  syncPingReply2RpcMsg(pMsgReply, &rpcMsg);
+  syncNodeSendMsgById(&pMsgReply->destId, ths, &rpcMsg);
+
   return ret;
 }
 
-static int32_t onSyncNodeRequestVote(struct SSyncNode* ths, SyncRequestVote* pMsg) {
-  int32_t ret = ths->pRaft->FpOnRequestVote(ths->pRaft, pMsg);
+static int32_t syncNodeOnPingReplyCb(SSyncNode* ths, SyncPingReply* pMsg) {
+  int32_t ret = 0;
+  sTrace("<-- syncNodeOnPingReplyCb -->");
+
+  {
+    cJSON* pJson = syncPingReply2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    sTrace("syncNodeOnPingReplyCb syncNodePing pMsg:%s ", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
   return ret;
 }
 
-static int32_t onSyncNodeRequestVoteReply(struct SSyncNode* ths, SyncRequestVoteReply* pMsg) {
-  int32_t ret = ths->pRaft->FpOnRequestVoteReply(ths->pRaft, pMsg);
+static int32_t syncNodeOnRequestVoteCb(SSyncNode* ths, SyncRequestVote* pMsg) {
+  int32_t ret = 0;
   return ret;
 }
 
-static int32_t doSyncNodeAppendEntries(struct SSyncNode* ths, const SyncAppendEntries* pMsg) {
-  int32_t ret = ths->pRaft->FpAppendEntries(ths->pRaft, pMsg);
+static int32_t syncNodeOnRequestVoteReplyCb(SSyncNode* ths, SyncRequestVoteReply* pMsg) {
+  int32_t ret = 0;
   return ret;
 }
 
-static int32_t onSyncNodeAppendEntries(struct SSyncNode* ths, SyncAppendEntries* pMsg) {
-  int32_t ret = ths->pRaft->FpOnAppendEntries(ths->pRaft, pMsg);
+static int32_t syncNodeOnAppendEntriesCb(SSyncNode* ths, SyncAppendEntries* pMsg) {
+  int32_t ret = 0;
   return ret;
 }
 
-static int32_t onSyncNodeAppendEntriesReply(struct SSyncNode* ths, SyncAppendEntriesReply* pMsg) {
-  int32_t ret = ths->pRaft->FpOnAppendEntriesReply(ths->pRaft, pMsg);
+static int32_t syncNodeOnAppendEntriesReplyCb(SSyncNode* ths, SyncAppendEntriesReply* pMsg) {
+  int32_t ret = 0;
   return ret;
+}
+
+static void syncNodePingTimerCb(void* param, void* tmrId) {
+  SSyncNode* pSyncNode = (SSyncNode*)param;
+  if (atomic_load_8(&pSyncNode->pingTimerStart)) {
+    ++(pSyncNode->pingTimerCounter);
+    // pSyncNode->pingTimerMS += 100;
+
+    sTrace(
+        "syncNodePingTimerCb: pSyncNode->pingTimerCounter:%lu, pSyncNode->pingTimerMS:%d, pSyncNode->pPingTimer:%p, "
+        "tmrId:%p ",
+        pSyncNode->pingTimerCounter, pSyncNode->pingTimerMS, pSyncNode->pPingTimer, tmrId);
+
+    syncNodePingAll(pSyncNode);
+
+    taosTmrReset(syncNodePingTimerCb, pSyncNode->pingTimerMS, pSyncNode, &gSyncEnv->pTimerManager,
+                 &pSyncNode->pPingTimer);
+  } else {
+    sTrace("syncNodePingTimerCb: pingTimerStart:%u ", pSyncNode->pingTimerStart);
+  }
 }
\ No newline at end of file
diff --git a/source/libs/sync/src/syncMessage.c b/source/libs/sync/src/syncMessage.c
index 8937303725..a26c8401b2 100644
--- a/source/libs/sync/src/syncMessage.c
+++ b/source/libs/sync/src/syncMessage.c
@@ -15,5 +15,265 @@
 
 #include "syncMessage.h"
 #include "syncRaft.h"
+#include "syncUtil.h"
+#include "tcoding.h"
 
-void onMessage(SRaft *pRaft, void *pMsg) {}
\ No newline at end of file
+void onMessage(SRaft* pRaft, void* pMsg) {}
+
+// ---- message process SyncPing----
+SyncPing* syncPingBuild(uint32_t dataLen) {
+  uint32_t  bytes = SYNC_PING_FIX_LEN + dataLen;
+  SyncPing* pMsg = malloc(bytes);
+  memset(pMsg, 0, bytes);
+  pMsg->bytes = bytes;
+  pMsg->msgType = SYNC_PING;
+  pMsg->dataLen = dataLen;
+}
+
+void syncPingDestroy(SyncPing* pMsg) {
+  if (pMsg != NULL) {
+    free(pMsg);
+  }
+}
+
+void syncPingSerialize(const SyncPing* pMsg, char* buf, uint32_t bufLen) {
+  assert(pMsg->bytes <= bufLen);
+  memcpy(buf, pMsg, pMsg->bytes);
+}
+
+void syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg) {
+  memcpy(pMsg, buf, len);
+  assert(len == pMsg->bytes);
+  assert(pMsg->bytes == SYNC_PING_FIX_LEN + pMsg->dataLen);
+}
+
+void syncPing2RpcMsg(const SyncPing* pMsg, SRpcMsg* pRpcMsg) {
+  memset(pRpcMsg, 0, sizeof(*pRpcMsg));
+  pRpcMsg->msgType = pMsg->msgType;
+  pRpcMsg->contLen = pMsg->bytes;
+  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
+  syncPingSerialize(pMsg, pRpcMsg->pCont, pRpcMsg->contLen);
+}
+
+void syncPingFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPing* pMsg) {
+  syncPingDeserialize(pRpcMsg->pCont, pRpcMsg->contLen, pMsg);
+}
+
+cJSON* syncPing2Json(const SyncPing* pMsg) {
+  cJSON* pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "bytes", pMsg->bytes);
+  cJSON_AddNumberToObject(pRoot, "msgType", pMsg->msgType);
+
+  cJSON* pSrcId = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pSrcId, "addr", pMsg->srcId.addr);
+  {
+    uint64_t u64 = pMsg->srcId.addr;
+    cJSON*   pTmp = pSrcId;
+    char     host[128];
+    uint16_t port;
+    syncUtilU642Addr(u64, host, sizeof(host), &port);
+    cJSON_AddStringToObject(pTmp, "addr_host", host);
+    cJSON_AddNumberToObject(pTmp, "addr_port", port);
+  }
+  cJSON_AddNumberToObject(pSrcId, "vgId", pMsg->srcId.vgId);
+  cJSON_AddItemToObject(pRoot, "srcId", pSrcId);
+
+  cJSON* pDestId = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pDestId, "addr", pMsg->destId.addr);
+  {
+    uint64_t u64 = pMsg->destId.addr;
+    cJSON*   pTmp = pDestId;
+    char     host[128];
+    uint16_t port;
+    syncUtilU642Addr(u64, host, sizeof(host), &port);
+    cJSON_AddStringToObject(pTmp, "addr_host", host);
+    cJSON_AddNumberToObject(pTmp, "addr_port", port);
+  }
+  cJSON_AddNumberToObject(pDestId, "vgId", pMsg->destId.vgId);
+  cJSON_AddItemToObject(pRoot, "destId", pDestId);
+
+  cJSON_AddNumberToObject(pRoot, "dataLen", pMsg->dataLen);
+  cJSON_AddStringToObject(pRoot, "data", pMsg->data);
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "SyncPing", pRoot);
+  return pJson;
+}
+
+SyncPing* syncPingBuild2(const SRaftId* srcId, const SRaftId* destId, const char* str) {
+  uint32_t  dataLen = strlen(str) + 1;
+  SyncPing* pMsg = syncPingBuild(dataLen);
+  pMsg->srcId = *srcId;
+  pMsg->destId = *destId;
+  snprintf(pMsg->data, pMsg->dataLen, "%s", str);
+  return pMsg;
+}
+
+SyncPing* syncPingBuild3(const SRaftId* srcId, const SRaftId* destId) {
+  SyncPing* pMsg = syncPingBuild2(srcId, destId, "ping");
+  return pMsg;
+}
+
+// ---- message process SyncPingReply----
+SyncPingReply* syncPingReplyBuild(uint32_t dataLen) {
+  uint32_t       bytes = SYNC_PING_REPLY_FIX_LEN + dataLen;
+  SyncPingReply* pMsg = malloc(bytes);
+  memset(pMsg, 0, bytes);
+  pMsg->bytes = bytes;
+  pMsg->msgType = SYNC_PING_REPLY;
+  pMsg->dataLen = dataLen;
+}
+
+void syncPingReplyDestroy(SyncPingReply* pMsg) {
+  if (pMsg != NULL) {
+    free(pMsg);
+  }
+}
+
+void syncPingReplySerialize(const SyncPingReply* pMsg, char* buf, uint32_t bufLen) {
+  assert(pMsg->bytes <= bufLen);
+  memcpy(buf, pMsg, pMsg->bytes);
+}
+
+void syncPingReplyDeserialize(const char* buf, uint32_t len, SyncPingReply* pMsg) {
+  memcpy(pMsg, buf, len);
+  assert(len == pMsg->bytes);
+  assert(pMsg->bytes == SYNC_PING_FIX_LEN + pMsg->dataLen);
+}
+
+void syncPingReply2RpcMsg(const SyncPingReply* pMsg, SRpcMsg* pRpcMsg) {
+  memset(pRpcMsg, 0, sizeof(*pRpcMsg));
+  pRpcMsg->msgType = pMsg->msgType;
+  pRpcMsg->contLen = pMsg->bytes;
+  pRpcMsg->pCont = rpcMallocCont(pRpcMsg->contLen);
+  syncPingReplySerialize(pMsg, pRpcMsg->pCont, pRpcMsg->contLen);
+}
+
+void syncPingReplyFromRpcMsg(const SRpcMsg* pRpcMsg, SyncPingReply* pMsg) {
+  syncPingReplyDeserialize(pRpcMsg->pCont, pRpcMsg->contLen, pMsg);
+}
+
+cJSON* syncPingReply2Json(const SyncPingReply* pMsg) {
+  cJSON* pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "bytes", pMsg->bytes);
+  cJSON_AddNumberToObject(pRoot, "msgType", pMsg->msgType);
+
+  cJSON* pSrcId = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pSrcId, "addr", pMsg->srcId.addr);
+  {
+    uint64_t u64 = pMsg->srcId.addr;
+    cJSON*   pTmp = pSrcId;
+    char     host[128];
+    uint16_t port;
+    syncUtilU642Addr(u64, host, sizeof(host), &port);
+    cJSON_AddStringToObject(pTmp, "addr_host", host);
+    cJSON_AddNumberToObject(pTmp, "addr_port", port);
+  }
+  cJSON_AddNumberToObject(pSrcId, "vgId", pMsg->srcId.vgId);
+  cJSON_AddItemToObject(pRoot, "srcId", pSrcId);
+
+  cJSON* pDestId = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pDestId, "addr", pMsg->destId.addr);
+  {
+    uint64_t u64 = pMsg->destId.addr;
+    cJSON*   pTmp = pDestId;
+    char     host[128];
+    uint16_t port;
+    syncUtilU642Addr(u64, host, sizeof(host), &port);
+    cJSON_AddStringToObject(pTmp, "addr_host", host);
+    cJSON_AddNumberToObject(pTmp, "addr_port", port);
+  }
+  cJSON_AddNumberToObject(pDestId, "vgId", pMsg->destId.vgId);
+  cJSON_AddItemToObject(pRoot, "destId", pDestId);
+
+  cJSON_AddNumberToObject(pRoot, "dataLen", pMsg->dataLen);
+  cJSON_AddStringToObject(pRoot, "data", pMsg->data);
+
+  cJSON* pJson = cJSON_CreateObject();
+  cJSON_AddItemToObject(pJson, "SyncPingReply", pRoot);
+  return pJson;
+}
+
+SyncPingReply* syncPingReplyBuild2(const SRaftId* srcId, const SRaftId* destId, const char* str) {
+  uint32_t       dataLen = strlen(str) + 1;
+  SyncPingReply* pMsg = syncPingReplyBuild(dataLen);
+  pMsg->srcId = *srcId;
+  pMsg->destId = *destId;
+  snprintf(pMsg->data, pMsg->dataLen, "%s", str);
+  return pMsg;
+}
+
+SyncPingReply* syncPingReplyBuild3(const SRaftId* srcId, const SRaftId* destId) {
+  SyncPingReply* pMsg = syncPingReplyBuild2(srcId, destId, "pang");
+  return pMsg;
+}
+
+#if 0
+void syncPingSerialize(const SyncPing* pMsg, char** ppBuf, uint32_t* bufLen) {
+  *bufLen = sizeof(SyncPing) + pMsg->dataLen;
+  *ppBuf = (char*)malloc(*bufLen);
+  void*    pStart = *ppBuf;
+  uint32_t allBytes = *bufLen;
+
+  int len = 0;
+  len = taosEncodeFixedU32(&pStart, pMsg->msgType);
+  allBytes -= len;
+  assert(len > 0);
+  pStart += len;
+
+  len = taosEncodeFixedU64(&pStart, pMsg->srcId.addr);
+  allBytes -= len;
+  assert(len > 0);
+  pStart += len;
+
+  len = taosEncodeFixedI32(&pStart, pMsg->srcId.vgId);
+  allBytes -= len;
+  assert(len > 0);
+  pStart += len;
+
+  len = taosEncodeFixedU64(&pStart, pMsg->destId.addr);
+  allBytes -= len;
+  assert(len > 0);
+  pStart += len;
+
+  len = taosEncodeFixedI32(&pStart, pMsg->destId.vgId);
+  allBytes -= len;
+  assert(len > 0);
+  pStart += len;
+
+  len = taosEncodeFixedU32(&pStart, pMsg->dataLen);
+  allBytes -= len;
+  assert(len > 0);
+  pStart += len;
+
+  memcpy(pStart, pMsg->data, pMsg->dataLen);
+  allBytes -= pMsg->dataLen;
+  assert(allBytes == 0);
+}
+
+
+void syncPingDeserialize(const char* buf, uint32_t len, SyncPing* pMsg) {
+  void*    pStart = (void*)buf;
+  uint64_t u64;
+  int32_t  i32;
+  uint32_t u32;
+
+  pStart = taosDecodeFixedU64(pStart, &u64);
+  pMsg->msgType = u64;
+
+  pStart = taosDecodeFixedU64(pStart, &u64);
+  pMsg->srcId.addr = u64;
+
+  pStart = taosDecodeFixedI32(pStart, &i32);
+  pMsg->srcId.vgId = i32;
+
+  pStart = taosDecodeFixedU64(pStart, &u64);
+  pMsg->destId.addr = u64;
+
+  pStart = taosDecodeFixedI32(pStart, &i32);
+  pMsg->destId.vgId = i32;
+
+  pStart = taosDecodeFixedU32(pStart, &u32);
+  pMsg->dataLen = u32;
+}
+#endif
\ No newline at end of file
diff --git a/source/libs/sync/src/syncRaft.c b/source/libs/sync/src/syncRaft.c
index 9f139730d1..b07c6ea797 100644
--- a/source/libs/sync/src/syncRaft.c
+++ b/source/libs/sync/src/syncRaft.c
@@ -16,6 +16,8 @@
 #include "syncRaft.h"
 #include "sync.h"
 
+#if 0
+
 SRaft* raftOpen(SRaftId raftId, SSyncFSM* pFsm) {
   SRaft* pRaft = (SRaft*)malloc(sizeof(SRaft));
   assert(pRaft != NULL);
@@ -64,3 +66,5 @@ static int32_t onRaftAppendEntriesReply(struct SRaft* ths, RaftAppendEntriesRepl
 int32_t raftPropose(SRaft* pRaft, const SSyncBuffer* pBuf, bool isWeak) { return 0; }
 
 static int raftSendMsg(SRaftId destRaftId, const void* pMsg, const SRaft* pRaft) { return 0; }
+
+#endif
\ No newline at end of file
diff --git a/source/libs/sync/src/syncRaftStore.c b/source/libs/sync/src/syncRaftStore.c
index 964cc78490..59c85c38de 100644
--- a/source/libs/sync/src/syncRaftStore.c
+++ b/source/libs/sync/src/syncRaftStore.c
@@ -18,23 +18,125 @@
 
 // to complie success: FileIO interface is modified
 
-SRaftStore *raftStoreOpen(const char *path) { return NULL;}
+SRaftStore *raftStoreOpen(const char *path) {
+  int32_t ret;
 
-static int32_t raftStoreInit(SRaftStore *pRaftStore) { return 0;}
+  SRaftStore *pRaftStore = malloc(sizeof(SRaftStore));
+  if (pRaftStore == NULL) {
+    sError("raftStoreOpen malloc error");
+    return NULL;
+  }
+  memset(pRaftStore, 0, sizeof(*pRaftStore));
+  snprintf(pRaftStore->path, sizeof(pRaftStore->path), "%s", path);
 
-int32_t raftStoreClose(SRaftStore *pRaftStore) { return 0;}
+  char storeBuf[RAFT_STORE_BLOCK_SIZE];
+  memset(storeBuf, 0, sizeof(storeBuf));
 
-int32_t raftStorePersist(SRaftStore *pRaftStore) { return 0;}
+  if (!raftStoreFileExist(pRaftStore->path)) {
+    ret = raftStoreInit(pRaftStore);
+    assert(ret == 0);
+  }
 
-static bool raftStoreFileExist(char *path) { return 0;}
+  pRaftStore->pFile = taosOpenFile(path, TD_FILE_READ | TD_FILE_WRITE);
+  assert(pRaftStore->pFile != NULL);
 
-int32_t raftStoreSerialize(SRaftStore *pRaftStore, char *buf, size_t len) { return 0;}
+  int len = taosReadFile(pRaftStore->pFile, storeBuf, RAFT_STORE_BLOCK_SIZE);
+  assert(len == RAFT_STORE_BLOCK_SIZE);
 
-int32_t raftStoreDeserialize(SRaftStore *pRaftStore, char *buf, size_t len) { return 0;}
+  ret = raftStoreDeserialize(pRaftStore, storeBuf, len);
+  assert(ret == 0);
 
-void raftStorePrint(SRaftStore *pRaftStore) {}
+  return pRaftStore;
+}
 
+static int32_t raftStoreInit(SRaftStore *pRaftStore) {
+  assert(pRaftStore != NULL);
 
+  pRaftStore->pFile = taosOpenFile(pRaftStore->path, TD_FILE_CTEATE | TD_FILE_WRITE);
+  assert(pRaftStore->pFile != NULL);
+
+  pRaftStore->currentTerm = 0;
+  pRaftStore->voteFor.addr = 0;
+  pRaftStore->voteFor.vgId = 0;
+
+  int32_t ret = raftStorePersist(pRaftStore);
+  assert(ret == 0);
+
+  taosCloseFile(&pRaftStore->pFile);
+  return 0;
+}
+
+int32_t raftStoreClose(SRaftStore *pRaftStore) {
+  assert(pRaftStore != NULL);
+
+  taosCloseFile(&pRaftStore->pFile);
+  free(pRaftStore);
+  pRaftStore = NULL;
+  return 0;
+}
+
+int32_t raftStorePersist(SRaftStore *pRaftStore) {
+  assert(pRaftStore != NULL);
+
+  int32_t ret;
+  char    storeBuf[RAFT_STORE_BLOCK_SIZE];
+  ret = raftStoreSerialize(pRaftStore, storeBuf, sizeof(storeBuf));
+  assert(ret == 0);
+
+  taosLSeekFile(pRaftStore->pFile, 0, SEEK_SET);
+
+  ret = taosWriteFile(pRaftStore->pFile, storeBuf, sizeof(storeBuf));
+  assert(ret == RAFT_STORE_BLOCK_SIZE);
+
+  taosFsyncFile(pRaftStore->pFile);
+  return 0;
+}
+
+static bool raftStoreFileExist(char *path) { return taosStatFile(path, NULL, NULL) >= 0; }
+
+int32_t raftStoreSerialize(SRaftStore *pRaftStore, char *buf, size_t len) {
+  assert(pRaftStore != NULL);
+
+  cJSON *pRoot = cJSON_CreateObject();
+  cJSON_AddNumberToObject(pRoot, "current_term", pRaftStore->currentTerm);
+  cJSON_AddNumberToObject(pRoot, "vote_for_addr", pRaftStore->voteFor.addr);
+  cJSON_AddNumberToObject(pRoot, "vote_for_vgid", pRaftStore->voteFor.vgId);
+
+  char *serialized = cJSON_Print(pRoot);
+  int   len2 = strlen(serialized);
+  assert(len2 < len);
+  memset(buf, 0, len);
+  snprintf(buf, len, "%s", serialized);
+  free(serialized);
+
+  cJSON_Delete(pRoot);
+  return 0;
+}
+
+int32_t raftStoreDeserialize(SRaftStore *pRaftStore, char *buf, size_t len) {
+  assert(pRaftStore != NULL);
+
+  assert(len > 0 && len <= RAFT_STORE_BLOCK_SIZE);
+  cJSON *pRoot = cJSON_Parse(buf);
+
+  cJSON *pCurrentTerm = cJSON_GetObjectItem(pRoot, "current_term");
+  pRaftStore->currentTerm = pCurrentTerm->valueint;
+
+  cJSON *pVoteForAddr = cJSON_GetObjectItem(pRoot, "vote_for_addr");
+  pRaftStore->voteFor.addr = pVoteForAddr->valueint;
+
+  cJSON *pVoteForVgid = cJSON_GetObjectItem(pRoot, "vote_for_vgid");
+  pRaftStore->voteFor.vgId = pVoteForVgid->valueint;
+
+  cJSON_Delete(pRoot);
+  return 0;
+}
+
+void raftStorePrint(SRaftStore *pRaftStore) {
+  char storeBuf[RAFT_STORE_BLOCK_SIZE];
+  raftStoreSerialize(pRaftStore, storeBuf, sizeof(storeBuf));
+  printf("%s\n", storeBuf);
+}
 
 #if 0
 
diff --git a/source/libs/sync/src/syncUtil.c b/source/libs/sync/src/syncUtil.c
new file mode 100644
index 0000000000..b4959a810b
--- /dev/null
+++ b/source/libs/sync/src/syncUtil.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "syncUtil.h"
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+
+// ---- encode / decode
+uint64_t syncUtilAddr2U64(const char* host, uint16_t port) {
+  uint64_t u64;
+  uint32_t hostU32 = (uint32_t)inet_addr(host);
+  // assert(hostU32 != (uint32_t)-1);
+  u64 = (((uint64_t)hostU32) << 32) | (((uint32_t)port) << 16);
+  return u64;
+}
+
+void syncUtilU642Addr(uint64_t u64, char* host, size_t len, uint16_t* port) {
+  uint32_t hostU32 = (uint32_t)((u64 >> 32) & 0x00000000FFFFFFFF);
+
+  struct in_addr addr;
+  addr.s_addr = hostU32;
+  snprintf(host, len, "%s", inet_ntoa(addr));
+  *port = (uint16_t)((u64 & 0x00000000FFFF0000) >> 16);
+}
+
+void syncUtilnodeInfo2EpSet(const SNodeInfo* pNodeInfo, SEpSet* pEpSet) {
+  pEpSet->inUse = 0;
+  pEpSet->numOfEps = 0;
+  addEpIntoEpSet(pEpSet, pNodeInfo->nodeFqdn, pNodeInfo->nodePort);
+}
+
+void syncUtilraftId2EpSet(const SRaftId* raftId, SEpSet* pEpSet) {
+  char     host[TSDB_FQDN_LEN];
+  uint16_t port;
+
+  syncUtilU642Addr(raftId->addr, host, sizeof(host), &port);
+
+  /*
+    pEpSet->numOfEps = 1;
+    pEpSet->inUse = 0;
+    pEpSet->eps[0].port = port;
+    snprintf(pEpSet->eps[0].fqdn, sizeof(pEpSet->eps[0].fqdn), "%s", host);
+  */
+  pEpSet->inUse = 0;
+  pEpSet->numOfEps = 0;
+  addEpIntoEpSet(pEpSet, host, port);
+}
+
+void syncUtilnodeInfo2raftId(const SNodeInfo* pNodeInfo, SyncGroupId vgId, SRaftId* raftId) {
+  uint32_t ipv4 = taosGetIpv4FromFqdn(pNodeInfo->nodeFqdn);
+  assert(ipv4 != 0xFFFFFFFF);
+  char ipbuf[128];
+  tinet_ntoa(ipbuf, ipv4);
+  raftId->addr = syncUtilAddr2U64(ipbuf, pNodeInfo->nodePort);
+  raftId->vgId = vgId;
+}
+
+// ---- SSyncBuffer -----
+#if 0
+void syncUtilbufBuild(SSyncBuffer* syncBuf, size_t len) {
+  syncBuf->len = len;
+  syncBuf->data = malloc(syncBuf->len);
+}
+
+void syncUtilbufDestroy(SSyncBuffer* syncBuf) { free(syncBuf->data); }
+
+void syncUtilbufCopy(const SSyncBuffer* src, SSyncBuffer* dest) {
+  dest->len = src->len;
+  dest->data = src->data;
+}
+
+void syncUtilbufCopyDeep(const SSyncBuffer* src, SSyncBuffer* dest) {
+  dest->len = src->len;
+  dest->data = malloc(dest->len);
+  memcpy(dest->data, src->data, dest->len);
+}
+#endif
\ No newline at end of file
diff --git a/source/libs/sync/test/CMakeLists.txt b/source/libs/sync/test/CMakeLists.txt
index e655ac01be..2913d230b2 100644
--- a/source/libs/sync/test/CMakeLists.txt
+++ b/source/libs/sync/test/CMakeLists.txt
@@ -1,6 +1,13 @@
 add_executable(syncTest "")
 add_executable(syncEnvTest "")
 add_executable(syncPingTest "")
+add_executable(syncEncodeTest "")
+add_executable(syncIOTickQTest "")
+add_executable(syncIOTickPingTest "")
+add_executable(syncIOSendMsgTest "")
+add_executable(syncIOSendMsgClientTest "")
+add_executable(syncIOSendMsgServerTest "")
+add_executable(syncRaftStoreTest "")
 
 
 target_sources(syncTest
@@ -15,6 +22,34 @@ target_sources(syncPingTest
     PRIVATE
     "syncPingTest.cpp"
 )
+target_sources(syncEncodeTest
+    PRIVATE
+    "syncEncodeTest.cpp"
+)
+target_sources(syncIOTickQTest
+    PRIVATE
+    "syncIOTickQTest.cpp"
+)
+target_sources(syncIOTickPingTest
+    PRIVATE
+    "syncIOTickPingTest.cpp"
+)
+target_sources(syncIOSendMsgTest
+    PRIVATE
+    "syncIOSendMsgTest.cpp"
+)
+target_sources(syncIOSendMsgClientTest
+    PRIVATE
+    "syncIOSendMsgClientTest.cpp"
+)
+target_sources(syncIOSendMsgServerTest
+    PRIVATE
+    "syncIOSendMsgServerTest.cpp"
+)
+target_sources(syncRaftStoreTest
+    PRIVATE
+    "syncRaftStoreTest.cpp"
+)
 
 
 target_include_directories(syncTest
@@ -32,6 +67,41 @@ target_include_directories(syncPingTest
     "${CMAKE_SOURCE_DIR}/include/libs/sync"
     "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
 )
+target_include_directories(syncEncodeTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncIOTickQTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncIOTickPingTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncIOSendMsgTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncIOSendMsgClientTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncIOSendMsgServerTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
+target_include_directories(syncRaftStoreTest
+    PUBLIC
+    "${CMAKE_SOURCE_DIR}/include/libs/sync"
+    "${CMAKE_CURRENT_SOURCE_DIR}/../inc"
+)
 
 
 target_link_libraries(syncTest
@@ -46,6 +116,34 @@ target_link_libraries(syncPingTest
     sync
     gtest_main
 )
+target_link_libraries(syncEncodeTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncIOTickQTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncIOTickPingTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncIOSendMsgTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncIOSendMsgClientTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncIOSendMsgServerTest
+    sync
+    gtest_main
+)
+target_link_libraries(syncRaftStoreTest
+    sync
+    gtest_main
+)
 
 
 enable_testing()
diff --git a/source/libs/sync/test/syncEncodeTest.cpp b/source/libs/sync/test/syncEncodeTest.cpp
new file mode 100644
index 0000000000..4deceb603e
--- /dev/null
+++ b/source/libs/sync/test/syncEncodeTest.cpp
@@ -0,0 +1,184 @@
+#include <stdio.h>
+#include "syncEnv.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncMessage.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+#define PING_MSG_LEN 20
+
+void test1() {
+  sTrace("test1: ---- syncPingSerialize, syncPingDeserialize");
+
+  char msg[PING_MSG_LEN];
+  snprintf(msg, sizeof(msg), "%s", "test ping");
+  SyncPing* pMsg = syncPingBuild(PING_MSG_LEN);
+  pMsg->srcId.addr = 1;
+  pMsg->srcId.vgId = 2;
+  pMsg->destId.addr = 3;
+  pMsg->destId.vgId = 4;
+  memcpy(pMsg->data, msg, PING_MSG_LEN);
+
+  {
+    cJSON* pJson = syncPing2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPing: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  uint32_t bufLen = pMsg->bytes;
+  char*    buf = (char*)malloc(bufLen);
+  syncPingSerialize(pMsg, buf, bufLen);
+
+  SyncPing* pMsg2 = (SyncPing*)malloc(pMsg->bytes);
+  syncPingDeserialize(buf, bufLen, pMsg2);
+
+  {
+    cJSON* pJson = syncPing2Json(pMsg2);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPing2: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  syncPingDestroy(pMsg);
+  syncPingDestroy(pMsg2);
+  free(buf);
+}
+
+void test2() {
+  sTrace("test2: ---- syncPing2RpcMsg, syncPingFromRpcMsg");
+
+  char msg[PING_MSG_LEN];
+  snprintf(msg, sizeof(msg), "%s", "hello raft");
+  SyncPing* pMsg = syncPingBuild(PING_MSG_LEN);
+  pMsg->srcId.addr = 100;
+  pMsg->srcId.vgId = 200;
+  pMsg->destId.addr = 300;
+  pMsg->destId.vgId = 400;
+  memcpy(pMsg->data, msg, PING_MSG_LEN);
+
+  {
+    cJSON* pJson = syncPing2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPing: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  SRpcMsg rpcMsg;
+  syncPing2RpcMsg(pMsg, &rpcMsg);
+  SyncPing* pMsg2 = (SyncPing*)malloc(pMsg->bytes);
+  syncPingFromRpcMsg(&rpcMsg, pMsg2);
+  rpcFreeCont(rpcMsg.pCont);
+
+  {
+    cJSON* pJson = syncPing2Json(pMsg2);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPing2: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  syncPingDestroy(pMsg);
+  syncPingDestroy(pMsg2);
+}
+
+void test3() {
+  sTrace("test3: ---- syncPingReplySerialize, syncPingReplyDeserialize");
+
+  char msg[PING_MSG_LEN];
+  snprintf(msg, sizeof(msg), "%s", "test ping");
+  SyncPingReply* pMsg = syncPingReplyBuild(PING_MSG_LEN);
+  pMsg->srcId.addr = 19;
+  pMsg->srcId.vgId = 29;
+  pMsg->destId.addr = 39;
+  pMsg->destId.vgId = 49;
+  memcpy(pMsg->data, msg, PING_MSG_LEN);
+
+  {
+    cJSON* pJson = syncPingReply2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPingReply: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  uint32_t bufLen = pMsg->bytes;
+  char*    buf = (char*)malloc(bufLen);
+  syncPingReplySerialize(pMsg, buf, bufLen);
+
+  SyncPingReply* pMsg2 = (SyncPingReply*)malloc(pMsg->bytes);
+  syncPingReplyDeserialize(buf, bufLen, pMsg2);
+
+  {
+    cJSON* pJson = syncPingReply2Json(pMsg2);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPingReply2: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  syncPingReplyDestroy(pMsg);
+  syncPingReplyDestroy(pMsg2);
+  free(buf);
+}
+
+void test4() {
+  sTrace("test4: ---- syncPingReply2RpcMsg, syncPingReplyFromRpcMsg");
+
+  char msg[PING_MSG_LEN];
+  snprintf(msg, sizeof(msg), "%s", "hello raft");
+  SyncPingReply* pMsg = syncPingReplyBuild(PING_MSG_LEN);
+  pMsg->srcId.addr = 66;
+  pMsg->srcId.vgId = 77;
+  pMsg->destId.addr = 88;
+  pMsg->destId.vgId = 99;
+  memcpy(pMsg->data, msg, PING_MSG_LEN);
+
+  {
+    cJSON* pJson = syncPingReply2Json(pMsg);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPingReply: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  SRpcMsg rpcMsg;
+  syncPingReply2RpcMsg(pMsg, &rpcMsg);
+  SyncPingReply* pMsg2 = (SyncPingReply*)malloc(pMsg->bytes);
+  syncPingReplyFromRpcMsg(&rpcMsg, pMsg2);
+  rpcFreeCont(rpcMsg.pCont);
+
+  {
+    cJSON* pJson = syncPingReply2Json(pMsg2);
+    char*  serialized = cJSON_Print(pJson);
+    printf("SyncPingReply2: \n%s\n\n", serialized);
+    free(serialized);
+    cJSON_Delete(pJson);
+  }
+
+  syncPingReplyDestroy(pMsg);
+  syncPingReplyDestroy(pMsg2);
+}
+int main() {
+  // taosInitLog((char*)"syncPingTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  test1();
+  test2();
+  test3();
+  test4();
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncEnvTest.cpp b/source/libs/sync/test/syncEnvTest.cpp
index 1d050e7094..1ac4357c5a 100644
--- a/source/libs/sync/test/syncEnvTest.cpp
+++ b/source/libs/sync/test/syncEnvTest.cpp
@@ -34,19 +34,20 @@ void doSync() {
 }
 
 int main() {
-  //taosInitLog((char*)"syncEnvTest.log", 100000, 10);
+  // taosInitLog((char*)"syncEnvTest.log", 100000, 10);
   tsAsyncLog = 0;
   sDebugFlag = 143 + 64;
+  int32_t ret;
 
   logTest();
 
-  int32_t ret = syncIOStart();
-  assert(ret == 0);
+  // ret = syncIOStart();
+  // assert(ret == 0);
 
   ret = syncEnvStart();
   assert(ret == 0);
 
-  doSync();
+  // doSync();
 
   while (1) {
     taosMsleep(1000);
diff --git a/source/libs/sync/test/syncIOSendMsgClientTest.cpp b/source/libs/sync/test/syncIOSendMsgClientTest.cpp
new file mode 100644
index 0000000000..9e8c7c8b65
--- /dev/null
+++ b/source/libs/sync/test/syncIOSendMsgClientTest.cpp
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include "gtest/gtest.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+int main() {
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  logTest();
+
+  int32_t ret;
+
+  ret = syncIOStart((char *)"127.0.0.1", 7010);
+  assert(ret == 0);
+
+  for (int i = 0; i < 10; ++i) {
+    SEpSet epSet;
+    epSet.inUse = 0;
+    epSet.numOfEps = 0;
+    addEpIntoEpSet(&epSet, "127.0.0.1", 7030);
+
+    SRpcMsg rpcMsg;
+    rpcMsg.contLen = 64;
+    rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);
+    snprintf((char *)rpcMsg.pCont, rpcMsg.contLen, "%s", "syncIOSendMsgTest");
+    rpcMsg.handle = NULL;
+    rpcMsg.msgType = 77;
+
+    syncIOSendMsg(gSyncIO->clientRpc, &epSet, &rpcMsg);
+    sleep(1);
+  }
+
+  while (1) {
+    sleep(1);
+  }
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncIOSendMsgServerTest.cpp b/source/libs/sync/test/syncIOSendMsgServerTest.cpp
new file mode 100644
index 0000000000..8af9344ed6
--- /dev/null
+++ b/source/libs/sync/test/syncIOSendMsgServerTest.cpp
@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include "gtest/gtest.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+int main() {
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  logTest();
+
+  int32_t ret;
+
+  ret = syncIOStart((char *)"127.0.0.1", 7030);
+  assert(ret == 0);
+
+  while (1) {
+    sleep(1);
+  }
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncIOSendMsgTest.cpp b/source/libs/sync/test/syncIOSendMsgTest.cpp
new file mode 100644
index 0000000000..a297981ee5
--- /dev/null
+++ b/source/libs/sync/test/syncIOSendMsgTest.cpp
@@ -0,0 +1,50 @@
+#include <stdio.h>
+#include "gtest/gtest.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+int main() {
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  logTest();
+
+  int32_t ret;
+
+  ret = syncIOStart((char *)"127.0.0.1", 7010);
+  assert(ret == 0);
+
+  for (int i = 0; i < 10; ++i) {
+    SEpSet epSet;
+    epSet.inUse = 0;
+    epSet.numOfEps = 0;
+    addEpIntoEpSet(&epSet, "127.0.0.1", 7010);
+
+    SRpcMsg rpcMsg;
+    rpcMsg.contLen = 64;
+    rpcMsg.pCont = rpcMallocCont(rpcMsg.contLen);
+    snprintf((char *)rpcMsg.pCont, rpcMsg.contLen, "%s", "syncIOSendMsgTest");
+    rpcMsg.handle = NULL;
+    rpcMsg.msgType = 77;
+
+    syncIOSendMsg(gSyncIO->clientRpc, &epSet, &rpcMsg);
+    sleep(1);
+  }
+
+  while (1) {
+    sleep(1);
+  }
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncIOTickPingTest.cpp b/source/libs/sync/test/syncIOTickPingTest.cpp
new file mode 100644
index 0000000000..1559b57585
--- /dev/null
+++ b/source/libs/sync/test/syncIOTickPingTest.cpp
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include "gtest/gtest.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+int main() {
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  logTest();
+
+  int32_t ret;
+
+  ret = syncIOStart((char*)"127.0.0.1", 7010);
+  assert(ret == 0);
+
+  ret = syncIOTickPing();
+  assert(ret == 0);
+
+  while (1) {
+    sleep(1);
+  }
+  return 0;
+}
diff --git a/source/libs/sync/test/syncIOTickQTest.cpp b/source/libs/sync/test/syncIOTickQTest.cpp
new file mode 100644
index 0000000000..90304079e3
--- /dev/null
+++ b/source/libs/sync/test/syncIOTickQTest.cpp
@@ -0,0 +1,35 @@
+#include <stdio.h>
+#include "gtest/gtest.h"
+#include "syncIO.h"
+#include "syncInt.h"
+#include "syncRaftStore.h"
+
+void logTest() {
+  sTrace("--- sync log test: trace");
+  sDebug("--- sync log test: debug");
+  sInfo("--- sync log test: info");
+  sWarn("--- sync log test: warn");
+  sError("--- sync log test: error");
+  sFatal("--- sync log test: fatal");
+}
+
+int main() {
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  logTest();
+
+  int32_t ret;
+
+  ret = syncIOStart((char*)"127.0.0.1", 7010);
+  assert(ret == 0);
+
+  ret = syncIOTickQ();
+  assert(ret == 0);
+
+  while (1) {
+    sleep(1);
+  }
+  return 0;
+}
diff --git a/source/libs/sync/test/syncPingTest.cpp b/source/libs/sync/test/syncPingTest.cpp
index e62d051946..24d9ead5e3 100644
--- a/source/libs/sync/test/syncPingTest.cpp
+++ b/source/libs/sync/test/syncPingTest.cpp
@@ -13,49 +13,71 @@ void logTest() {
   sFatal("--- sync log test: fatal");
 }
 
-void doSync() {
+SSyncNode* doSync() {
   SSyncFSM* pFsm;
 
   SSyncInfo syncInfo;
   syncInfo.vgId = 1;
+  syncInfo.rpcClient = gSyncIO->clientRpc;
   syncInfo.FpSendMsg = syncIOSendMsg;
   syncInfo.pFsm = pFsm;
   snprintf(syncInfo.path, sizeof(syncInfo.path), "%s", "./test_sync_ping");
 
   SSyncCfg* pCfg = &syncInfo.syncCfg;
   pCfg->myIndex = 0;
-  pCfg->replicaNum = 3;
+  pCfg->replicaNum = 2;
 
   pCfg->nodeInfo[0].nodePort = 7010;
-  taosGetFqdn(pCfg->nodeInfo[0].nodeFqdn);
+  snprintf(pCfg->nodeInfo[0].nodeFqdn, sizeof(pCfg->nodeInfo[0].nodeFqdn), "%s", "127.0.0.1");
+  // taosGetFqdn(pCfg->nodeInfo[0].nodeFqdn);
 
   pCfg->nodeInfo[1].nodePort = 7110;
-  taosGetFqdn(pCfg->nodeInfo[1].nodeFqdn);
+  snprintf(pCfg->nodeInfo[1].nodeFqdn, sizeof(pCfg->nodeInfo[1].nodeFqdn), "%s", "127.0.0.1");
+  // taosGetFqdn(pCfg->nodeInfo[1].nodeFqdn);
 
   pCfg->nodeInfo[2].nodePort = 7210;
-  taosGetFqdn(pCfg->nodeInfo[2].nodeFqdn);
+  snprintf(pCfg->nodeInfo[2].nodeFqdn, sizeof(pCfg->nodeInfo[2].nodeFqdn), "%s", "127.0.0.1");
+  // taosGetFqdn(pCfg->nodeInfo[2].nodeFqdn);
 
   SSyncNode* pSyncNode = syncNodeOpen(&syncInfo);
   assert(pSyncNode != NULL);
 
-  gSyncIO->FpOnPing = pSyncNode->FpOnPing;
+  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
   gSyncIO->pSyncNode = pSyncNode;
+
+  return pSyncNode;
+}
+
+void timerPingAll(void* param, void* tmrId) {
+  SSyncNode* pSyncNode = (SSyncNode*)param;
+  syncNodePingAll(pSyncNode);
 }
 
 int main() {
-  //taosInitLog((char*)"syncPingTest.log", 100000, 10);
+  // taosInitLog((char*)"syncPingTest.log", 100000, 10);
   tsAsyncLog = 0;
   sDebugFlag = 143 + 64;
 
   logTest();
 
-  int32_t ret = syncIOStart();
+  int32_t ret = syncIOStart((char*)"127.0.0.1", 7010);
   assert(ret == 0);
 
   ret = syncEnvStart();
   assert(ret == 0);
 
-  doSync();
+  SSyncNode* pSyncNode = doSync();
+  gSyncIO->FpOnSyncPing = pSyncNode->FpOnPing;
+  gSyncIO->FpOnSyncPingReply = pSyncNode->FpOnPingReply;
+
+  ret = syncNodeStartPingTimer(pSyncNode);
+  assert(ret == 0);
+
+  /*
+  taosMsleep(10000);
+  ret = syncNodeStopPingTimer(pSyncNode);
+  assert(ret == 0);
+  */
 
   while (1) {
     taosMsleep(1000);
diff --git a/source/libs/sync/test/syncRaftStoreTest.cpp b/source/libs/sync/test/syncRaftStoreTest.cpp
new file mode 100644
index 0000000000..e533b89a92
--- /dev/null
+++ b/source/libs/sync/test/syncRaftStoreTest.cpp
@@ -0,0 +1,42 @@
+#include "syncRaftStore.h"
+#include <stdio.h>
+#include "gtest/gtest.h"
+#include "syncIO.h"
+#include "syncInt.h"
+
+void *pingFunc(void *param) {
+  SSyncIO *io = (SSyncIO *)param;
+  while (1) {
+    sDebug("io->ping");
+    // io->ping(io);
+    sleep(1);
+  }
+  return NULL;
+}
+
+int main() {
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
+  tsAsyncLog = 0;
+  sDebugFlag = 143 + 64;
+
+  sTrace("sync log test: trace");
+  sDebug("sync log test: debug");
+  sInfo("sync log test: info");
+  sWarn("sync log test: warn");
+  sError("sync log test: error");
+  sFatal("sync log test: fatal");
+
+  SRaftStore *pRaftStore = raftStoreOpen("./raft_store.json");
+  assert(pRaftStore != NULL);
+
+  raftStorePrint(pRaftStore);
+
+  pRaftStore->currentTerm = 100;
+  pRaftStore->voteFor.addr = 200;
+  pRaftStore->voteFor.vgId = 300;
+
+  raftStorePrint(pRaftStore);
+  raftStorePersist(pRaftStore);
+
+  return 0;
+}
diff --git a/source/libs/sync/test/syncTest.cpp b/source/libs/sync/test/syncTest.cpp
index 0f72fd822f..0b397ef921 100644
--- a/source/libs/sync/test/syncTest.cpp
+++ b/source/libs/sync/test/syncTest.cpp
@@ -1,21 +1,21 @@
 #include <stdio.h>
+#include "gtest/gtest.h"
 #include "syncIO.h"
 #include "syncInt.h"
 #include "syncRaftStore.h"
-#include "gtest/gtest.h"
 
 void *pingFunc(void *param) {
   SSyncIO *io = (SSyncIO *)param;
   while (1) {
     sDebug("io->ping");
-    io->ping(io);
+    // io->ping(io);
     sleep(1);
   }
   return NULL;
 }
 
 int main() {
-  //taosInitLog((char *)"syncTest.log", 100000, 10);
+  // taosInitLog((char *)"syncTest.log", 100000, 10);
   tsAsyncLog = 0;
   sDebugFlag = 143 + 64;
 
diff --git a/source/libs/transport/CMakeLists.txt b/source/libs/transport/CMakeLists.txt
index a2e82201bf..465646ac95 100644
--- a/source/libs/transport/CMakeLists.txt
+++ b/source/libs/transport/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src TRANSPORT_SRC)
-add_library(transport ${TRANSPORT_SRC})
+add_library(transport STATIC ${TRANSPORT_SRC})
 target_include_directories(
     transport
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/transport"
diff --git a/source/libs/wal/CMakeLists.txt b/source/libs/wal/CMakeLists.txt
index bcf759e04f..4cf7cff818 100644
--- a/source/libs/wal/CMakeLists.txt
+++ b/source/libs/wal/CMakeLists.txt
@@ -1,5 +1,5 @@
 aux_source_directory(src WAL_SRC)
-add_library(wal ${WAL_SRC})
+add_library(wal STATIC ${WAL_SRC})
 target_include_directories(
     wal
     PUBLIC "${CMAKE_SOURCE_DIR}/include/libs/wal"
diff --git a/source/os/CMakeLists.txt b/source/os/CMakeLists.txt
index 0eda9d637d..c3bf94e888 100644
--- a/source/os/CMakeLists.txt
+++ b/source/os/CMakeLists.txt
@@ -1,14 +1,10 @@
 aux_source_directory(src OS_SRC)
-add_library(os ${OS_SRC})
+add_library(os STATIC ${OS_SRC})
 target_include_directories(
     os
     PUBLIC "${CMAKE_SOURCE_DIR}/include/os"
     PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}/include"
 )
 target_link_libraries(
-    os
-    PUBLIC pthread
-    PUBLIC dl
-    PUBLIC rt
-    PUBLIC m
+    os pthread dl rt m
 )
\ No newline at end of file
diff --git a/source/os/src/osSysinfo.c b/source/os/src/osSysinfo.c
index 163fad803f..3e761c6d91 100644
--- a/source/os/src/osSysinfo.c
+++ b/source/os/src/osSysinfo.c
@@ -167,11 +167,9 @@ void taosGetSystemInfo() {
   tsTotalMemoryMB = taosGetTotalMemory();
 
   float tmp1, tmp2;
-  // taosGetDisk();
   taosGetBandSpeed(&tmp1);
   taosGetCpuUsage(&tmp1, &tmp2);
   taosGetProcIO(&tmp1, &tmp2);
-
 }
 
 void taosKillSystem() {
@@ -712,7 +710,6 @@ void taosGetSystemInfo() {
   float tmp1, tmp2;
   taosGetSysMemory(&tmp1);
   taosGetProcMemory(&tmp2);
-  // taosGetDisk();
   taosGetBandSpeed(&tmp1);
   taosGetCpuUsage(&tmp1, &tmp2);
   taosGetProcIO(&tmp1, &tmp2);
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index c8cafb93dd..176290ba38 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -345,6 +345,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_TDB_IVD_CREATE_TABLE_INFO,    "Invalid information t
 TAOS_DEFINE_ERROR(TSDB_CODE_TDB_NO_AVAIL_DISK,            "No available disk")
 TAOS_DEFINE_ERROR(TSDB_CODE_TDB_MESSED_MSG,               "TSDB messed message")
 TAOS_DEFINE_ERROR(TSDB_CODE_TDB_IVLD_TAG_VAL,             "TSDB invalid tag value")
+TAOS_DEFINE_ERROR(TSDB_CODE_TDB_NO_CACHE_LAST_ROW,        "TSDB no cache last row data")
 
 // query
 TAOS_DEFINE_ERROR(TSDB_CODE_QRY_INVALID_QHANDLE,          "Invalid handle")
diff --git a/source/util/src/thttp.c b/source/util/src/thttp.c
index 14c39d3f03..adf29b1aa9 100644
--- a/source/util/src/thttp.c
+++ b/source/util/src/thttp.c
@@ -32,7 +32,7 @@ int32_t taosSendHttpReport(const char* server, uint16_t port, const char* pCont,
   fd = taosOpenTcpClientSocket(ip, port, 0);
   if (fd < 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
-    uError("failed to create http socket since %s", terrstr());
+    uError("failed to create http socket to %s:%u since %s", server, port, terrstr());
     goto SEND_OVER;
   }
 
@@ -46,24 +46,24 @@ int32_t taosSendHttpReport(const char* server, uint16_t port, const char* pCont,
 
   if (taosWriteSocket(fd, (void*)header, headLen) < 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
-    uError("failed to send http header since %s", terrstr());
+    uError("failed to send http header to %s:%u since %s", server, port, terrstr());
     goto SEND_OVER;
   }
 
   if (taosWriteSocket(fd, (void*)pCont, contLen) < 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
-    uError("failed to send http content since %s", terrstr());
+    uError("failed to send http content to %s:%u since %s", server, port, terrstr());
     goto SEND_OVER;
   }
 
   // read something to avoid nginx error 499
   if (taosReadSocket(fd, header, 10) < 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
-    uError("failed to receive response since %s", terrstr());
+    uError("failed to receive response from %s:%u since %s", server, port, terrstr());
     goto SEND_OVER;
   }
 
-  uInfo("send http to %s:%d, len:%d content: %s", server, port, contLen, pCont);
+  uInfo("send http to %s:%u, len:%d content: %s", server, port, contLen, pCont);
   code = 0;
 
 SEND_OVER:
diff --git a/source/util/src/tjson.c b/source/util/src/tjson.c
index 2c117771b1..27848c4e23 100644
--- a/source/util/src/tjson.c
+++ b/source/util/src/tjson.c
@@ -26,7 +26,11 @@ SJson* tjsonCreateObject() {
   return pJson;
 }
 
-void tjsonDelete(SJson* pJson) { cJSON_Delete((cJSON*)pJson); }
+void tjsonDelete(SJson* pJson) {
+  if (pJson != NULL) {
+    cJSON_Delete((cJSON*)pJson);
+  }
+}
 
 int32_t tjsonAddIntegerToObject(SJson* pJson, const char* pName, const uint64_t number) {
   char tmp[40] = {0};