diff --git a/include/libs/sync/sync.h b/include/libs/sync/sync.h
index dd2157655c..454a2ecfa8 100644
--- a/include/libs/sync/sync.h
+++ b/include/libs/sync/sync.h
@@ -24,10 +24,10 @@ extern "C" {
 #include "taosdef.h"
 #include "wal.h"
 
-typedef uint32_t SyncNodeId;
-typedef int32_t  SyncGroupId;
-typedef int64_t  SyncIndex;
-typedef uint64_t SyncTerm;
+typedef int64_t SyncNodeId;
+typedef int32_t SyncGroupId;
+typedef int64_t   SyncIndex;
+typedef uint64_t SSyncTerm;
 
 typedef enum {
   TAOS_SYNC_ROLE_FOLLOWER = 0,
@@ -41,9 +41,8 @@ typedef struct {
 } SSyncBuffer;
 
 typedef struct {
-  SyncNodeId nodeId;                   // node ID assigned by TDengine
-  uint16_t   nodePort;                 // node sync Port
-  char       nodeFqdn[TSDB_FQDN_LEN];  // node FQDN
+  uint16_t  nodePort;  // node sync Port
+  char      nodeFqdn[TSDB_FQDN_LEN]; // node FQDN  
 } SNodeInfo;
 
 typedef struct {
@@ -53,9 +52,9 @@ typedef struct {
 } SSyncCluster;
 
 typedef struct {
-  int32_t     selfIndex;
-  int         nNode;
-  SyncNodeId* nodeId;
+  int32_t  selfIndex;
+  int nNode;
+  SNodeInfo* node;
   ESyncRole*  role;
 } SNodesRole;
 
@@ -85,8 +84,8 @@ typedef struct SSyncFSM {
 } SSyncFSM;
 
 typedef struct SSyncServerState {
-  SyncNodeId voteFor;
-  SyncTerm   term;
+  SNodeInfo voteFor;
+  SSyncTerm term;
 } SSyncServerState;
 
 typedef struct SStateManager {
@@ -106,8 +105,8 @@ typedef struct {
 
   twalh walHandle;
 
-  SyncIndex    snapshotIndex;  // initial version
-  SSyncCluster syncCfg;        // configuration from mgmt
+  SyncIndex snapshotIndex;
+  SSyncCluster syncCfg;
 
   SSyncFSM fsm;
 
@@ -122,7 +121,11 @@ void       syncStop(SyncNodeId);
 
 int32_t syncPropose(SyncNodeId nodeId, SSyncBuffer buffer, void* pData, bool isWeak);
 
-extern int32_t syncDebugFlag;
+int32_t syncAddNode(SyncNodeId nodeId, const SNodeInfo *pNode);
+
+int32_t syncRemoveNode(SyncNodeId nodeId, const SNodeInfo *pNode);
+
+extern int32_t  syncDebugFlag;
 
 #ifdef __cplusplus
 }