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/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/vnode.h b/source/dnode/vnode/inc/vnode.h
index 31f04e840a..b5b53d9361 100644
--- a/source/dnode/vnode/inc/vnode.h
+++ b/source/dnode/vnode/inc/vnode.h
@@ -60,10 +60,6 @@ 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/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/osFile.c b/source/os/src/osFile.c
index 136afb9a15..c2e9b52f88 100644
--- a/source/os/src/osFile.c
+++ b/source/os/src/osFile.c
@@ -15,8 +15,6 @@
 #define ALLOW_FORBID_FUNC
 #include "os.h"
 
-#define MAX_FPRINTFLINE_BUFFER_SIZE (1000)
-
 #if defined(_TD_WINDOWS_64) || defined(_TD_WINDOWS_32)
 #include <io.h>
 
@@ -46,10 +44,15 @@ extern int openU(const char *, int, ...); /* MsvcLibX UTF-8 version of open */
 
 typedef int32_t FileFd;
 
+#define FILE_WITH_LOCK 1
+
 typedef struct TdFile {
-  int    refId;
-  FileFd fd;
-  FILE  *fp;
+#if FILE_WITH_LOCK
+  pthread_rwlock_t rwlock;
+#endif
+  int      refId;
+  FileFd   fd;
+  FILE    *fp;
 } * TdFilePtr, TdFile;
 
 void taosGetTmpfilePath(const char *inputTmpDir, const char *fileNamePrefix, char *dstPath) {
@@ -238,6 +241,9 @@ TdFilePtr taosOpenFile(const char *path, int32_t tdFileOptions) {
     if (fp != NULL) fclose(fp);
     return NULL;
   }
+#if FILE_WITH_LOCK
+  pthread_rwlock_init(&(pFile->rwlock),NULL);
+#endif
   pFile->fd = fd;
   pFile->fp = fp;
   pFile->refId = 0;
@@ -249,6 +255,12 @@ int64_t taosCloseFile(TdFilePtr *ppFile) {
 #if defined(_TD_WINDOWS_64) || defined(_TD_WINDOWS_32)
   return 0;
 #else
+  if (ppFile == NULL || *ppFile == NULL) {
+    return 0;
+  }
+#if FILE_WITH_LOCK
+  pthread_rwlock_wrlock(&((*ppFile)->rwlock));
+#endif
   if (ppFile == NULL || *ppFile == NULL || (*ppFile)->fd == -1) {
     return 0;
   }
@@ -263,6 +275,10 @@ int64_t taosCloseFile(TdFilePtr *ppFile) {
     (*ppFile)->fd = -1;
   }
   (*ppFile)->refId = 0;
+#if FILE_WITH_LOCK
+  pthread_rwlock_unlock(&((*ppFile)->rwlock));
+  pthread_rwlock_destroy(&((*ppFile)->rwlock));
+#endif
   free(*ppFile);
   *ppFile = NULL;
   return 0;
@@ -273,6 +289,9 @@ int64_t taosReadFile(TdFilePtr pFile, void *buf, int64_t count) {
   if (pFile == NULL) {
     return 0;
   }
+#if FILE_WITH_LOCK
+  pthread_rwlock_rdlock(&(pFile->rwlock));
+#endif
   assert(pFile->fd >= 0);
   int64_t leftbytes = count;
   int64_t readbytes;
@@ -284,9 +303,15 @@ int64_t taosReadFile(TdFilePtr pFile, void *buf, int64_t count) {
       if (errno == EINTR) {
         continue;
       } else {
+#if FILE_WITH_LOCK
+        pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
         return -1;
       }
     } else if (readbytes == 0) {
+#if FILE_WITH_LOCK
+      pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
       return (int64_t)(count - leftbytes);
     }
 
@@ -294,6 +319,9 @@ int64_t taosReadFile(TdFilePtr pFile, void *buf, int64_t count) {
     tbuf += readbytes;
   }
 
+#if FILE_WITH_LOCK
+  pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
   return count;
 }
 
@@ -301,14 +329,24 @@ int64_t taosPReadFile(TdFilePtr pFile, void *buf, int64_t count, int64_t offset)
   if (pFile == NULL) {
     return 0;
   }
+#if FILE_WITH_LOCK
+  pthread_rwlock_rdlock(&(pFile->rwlock));
+#endif
   assert(pFile->fd >= 0);
-  return pread(pFile->fd, buf, count, offset);
+  int64_t ret = pread(pFile->fd, buf, count, offset);
+#if FILE_WITH_LOCK
+  pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
+  return ret;
 }
 
 int64_t taosWriteFile(TdFilePtr pFile, const void *buf, int64_t count) {
   if (pFile == NULL) {
     return 0;
   }
+#if FILE_WITH_LOCK
+  pthread_rwlock_wrlock(&(pFile->rwlock));
+#endif
   assert(pFile->fd >= 0);
 
   int64_t nleft = count;
@@ -321,12 +359,18 @@ int64_t taosWriteFile(TdFilePtr pFile, const void *buf, int64_t count) {
       if (errno == EINTR) {
         continue;
       }
+#if FILE_WITH_LOCK
+      pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
       return -1;
     }
     nleft -= nwritten;
     tbuf += nwritten;
   }
-  fsync(pFile->fd);
+
+#if FILE_WITH_LOCK
+  pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
   return count;
 }
 
@@ -334,8 +378,15 @@ int64_t taosLSeekFile(TdFilePtr pFile, int64_t offset, int32_t whence) {
   if (pFile == NULL) {
     return 0;
   }
+#if FILE_WITH_LOCK
+  pthread_rwlock_rdlock(&(pFile->rwlock));
+#endif
   assert(pFile->fd >= 0);
-  return (int64_t)lseek(pFile->fd, (long)offset, whence);
+  int64_t ret = lseek(pFile->fd, (long)offset, whence);
+#if FILE_WITH_LOCK
+  pthread_rwlock_unlock(&(pFile->rwlock));
+#endif
+  return ret;
 }
 
 int32_t taosFStatFile(TdFilePtr pFile, int64_t *size, int32_t *mtime) {
@@ -637,7 +688,6 @@ void taosFprintfFile(TdFilePtr pFile, const char *format, ...) {
   }
   assert(pFile->fp != NULL);
 
-  char    buffer[MAX_FPRINTFLINE_BUFFER_SIZE] = {0};
   va_list ap;
   va_start(ap, format);
   vfprintf(pFile->fp, format, ap);
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/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};