refactor(sync): add trace log

source/libs/sync/src/syncMain.c

@@ -2178,8 +2178,16 @@ static int32_t syncNodeConfigChange(SSyncNode* ths, SRpcMsg* pRpcMsg, SSyncRaftE
 
     // change isStandBy to normal
     if (!isDrop) {
-      char tmpbuf[128];
-      snprintf(tmpbuf, sizeof(tmpbuf), "config change from %d to %d", oldSyncCfg.replicaNum, newSyncCfg.replicaNum);
+      char  tmpbuf[512];
+      char* oldStr = syncCfg2Str(&oldSyncCfg);
+      char* newStr = syncCfg2Str(&newSyncCfg);
+      syncUtilJson2Line(oldStr);
+      syncUtilJson2Line(newStr);
+      snprintf(tmpbuf, sizeof(tmpbuf), "config change from %d to %d, %s  -->  %s", oldSyncCfg.replicaNum,
+               newSyncCfg.replicaNum, oldStr, newStr);
+      taosMemoryFree(oldStr);
+      taosMemoryFree(newStr);
+
       if (ths->state == TAOS_SYNC_STATE_LEADER) {
         syncNodeBecomeLeader(ths, tmpbuf);
       } else {
@@ -2187,8 +2195,16 @@ static int32_t syncNodeConfigChange(SSyncNode* ths, SRpcMsg* pRpcMsg, SSyncRaftE
       }
     }
   } else {
-    char tmpbuf[128];
-    snprintf(tmpbuf, sizeof(tmpbuf), "config change2 from %d to %d", oldSyncCfg.replicaNum, newSyncCfg.replicaNum);
+    char  tmpbuf[512];
+    char* oldStr = syncCfg2Str(&oldSyncCfg);
+    char* newStr = syncCfg2Str(&newSyncCfg);
+    syncUtilJson2Line(oldStr);
+    syncUtilJson2Line(newStr);
+    snprintf(tmpbuf, sizeof(tmpbuf), "config change2 from %d to %d, %s  -->  %s", oldSyncCfg.replicaNum,
+             newSyncCfg.replicaNum, oldStr, newStr);
+    taosMemoryFree(oldStr);
+    taosMemoryFree(newStr);
+
     syncNodeBecomeFollower(ths, tmpbuf);
   }
 

source/libs/sync/src/syncSnapshot.c

@@ -611,7 +611,8 @@ int32_t syncNodeOnSnapshotSendCb(SSyncNode *pSyncNode, SyncSnapshotSend *pMsg) {
 
         // maybe update lastconfig
         if (pMsg->lastConfigIndex >= SYNC_INDEX_BEGIN) {
-          int32_t oldReplicaNum = pSyncNode->replicaNum;
+          // int32_t  oldReplicaNum = pSyncNode->replicaNum;
+          SSyncCfg oldSyncCfg = pSyncNode->pRaftCfg->cfg;
 
           // update new config myIndex
           SSyncCfg newSyncCfg = pMsg->lastConfig;
@@ -651,8 +652,16 @@ int32_t syncNodeOnSnapshotSendCb(SSyncNode *pSyncNode, SyncSnapshotSend *pMsg) {
 
           // change isStandBy to normal
           if (!isDrop) {
-            char tmpbuf[128];
-            snprintf(tmpbuf, sizeof(tmpbuf), "config change3 from %d to %d", oldReplicaNum, newSyncCfg.replicaNum);
+            char  tmpbuf[512];
+            char *oldStr = syncCfg2Str(&oldSyncCfg);
+            char *newStr = syncCfg2Str(&newSyncCfg);
+            syncUtilJson2Line(oldStr);
+            syncUtilJson2Line(newStr);
+            snprintf(tmpbuf, sizeof(tmpbuf), "config change3 from %d to %d, %s  -->  %s", oldSyncCfg.replicaNum,
+                     newSyncCfg.replicaNum, oldStr, newStr);
+            taosMemoryFree(oldStr);
+            taosMemoryFree(newStr);
+
             if (pSyncNode->state == TAOS_SYNC_STATE_LEADER) {
               syncNodeBecomeLeader(pSyncNode, tmpbuf);
             } else {