diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index 3823252de6ab29c60d6db1bcd30774d9e7ce6b39..b315432be1c2deb565af64160e244fe76304d623 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -520,6 +520,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_SYN_BATCH_ERROR               TAOS_DEF_ERROR_CODE(0, 0x0913)
 #define TSDB_CODE_SYN_RESTORING                 TAOS_DEF_ERROR_CODE(0, 0x0914)
 #define TSDB_CODE_SYN_INVALID_SNAPSHOT_MSG      TAOS_DEF_ERROR_CODE(0, 0x0915)  // internal
+#define TSDB_CODE_SYN_BUFFER_FULL               TAOS_DEF_ERROR_CODE(0, 0x0916)  //
 #define TSDB_CODE_SYN_INTERNAL_ERROR            TAOS_DEF_ERROR_CODE(0, 0x09FF)
 
 // tq
diff --git a/source/dnode/vnode/src/vnd/vnodeSync.c b/source/dnode/vnode/src/vnd/vnodeSync.c
index 0437703c9220544b3dcc423d972afb456c0a7584..5697487743d30c5c1f76da4907ffd30bf30d1c7f 100644
--- a/source/dnode/vnode/src/vnd/vnodeSync.c
+++ b/source/dnode/vnode/src/vnd/vnodeSync.c
@@ -391,9 +391,9 @@ static int32_t vnodeSyncApplyMsg(const SSyncFSM *pFsm, SRpcMsg *pMsg, const SFsm
 
   const STraceId *trace = &pMsg->info.traceId;
   vGTrace("vgId:%d, commit-cb is excuted, fsm:%p, index:%" PRId64 ", term:%" PRIu64 ", msg-index:%" PRId64
-          ", weak:%d, code:%d, state:%d %s, type:%s",
+          ", weak:%d, code:%d, state:%d %s, type:%s code:0x%x",
           pVnode->config.vgId, pFsm, pMeta->index, pMeta->term, pMsg->info.conn.applyIndex, pMeta->isWeak, pMeta->code,
-          pMeta->state, syncStr(pMeta->state), TMSG_INFO(pMsg->msgType));
+          pMeta->state, syncStr(pMeta->state), TMSG_INFO(pMsg->msgType), pMsg->code);
 
   return tmsgPutToQueue(&pVnode->msgCb, APPLY_QUEUE, pMsg);
 }
diff --git a/source/libs/sync/inc/syncPipeline.h b/source/libs/sync/inc/syncPipeline.h
index 9188be2b4239f155688530deb5ccfa780528f137..a0a0691694776f2830d4f80ec2e96ec8bf782921 100644
--- a/source/libs/sync/inc/syncPipeline.h
+++ b/source/libs/sync/inc/syncPipeline.h
@@ -109,6 +109,8 @@ SSyncRaftEntry* syncLogBufferGetOneEntry(SSyncLogBuffer* pBuf, SSyncNode* pNode,
 int32_t         syncLogBufferValidate(SSyncLogBuffer* pBuf);
 int32_t         syncLogBufferRollback(SSyncLogBuffer* pBuf, SSyncNode* pNode, SyncIndex toIndex);
 
+int32_t syncLogFsmExecute(SSyncNode* pNode, SSyncFSM* pFsm, ESyncState role, SyncTerm term, SSyncRaftEntry* pEntry,
+                          int32_t applyCode);
 #ifdef __cplusplus
 }
 #endif
diff --git a/source/libs/sync/src/syncMain.c b/source/libs/sync/src/syncMain.c
index 152e16bd2ec641fd292efaa8ee73766356669706..636890b5aa8ab37458d05780333808f50e7eae54 100644
--- a/source/libs/sync/src/syncMain.c
+++ b/source/libs/sync/src/syncMain.c
@@ -2386,7 +2386,11 @@ int32_t syncCacheEntry(SSyncLogStore* pLogStore, SSyncRaftEntry* pEntry, LRUHand
 int32_t syncNodeAppend(SSyncNode* ths, SSyncRaftEntry* pEntry) {
   // append to log buffer
   if (syncLogBufferAppend(ths->pLogBuf, ths, pEntry) < 0) {
-    sError("vgId:%d, failed to enqueue sync log buffer. index:%" PRId64 "", ths->vgId, pEntry->index);
+    sError("vgId:%d, failed to enqueue sync log buffer, index:%" PRId64, ths->vgId, pEntry->index);
+    terrno = TSDB_CODE_SYN_BUFFER_FULL;
+    (void)syncLogFsmExecute(ths, ths->pFsm, ths->state, ths->pRaftStore->currentTerm, pEntry,
+                            TSDB_CODE_SYN_BUFFER_FULL);
+    syncEntryDestroy(pEntry);
     return -1;
   }
 
@@ -2685,8 +2689,8 @@ int32_t syncNodeOnClientRequest(SSyncNode* ths, SRpcMsg* pMsg, SyncIndex* pRetIn
     }
 
     int32_t code = syncNodeAppend(ths, pEntry);
-    if (code < 0 && ths->vgId != 1 && vnodeIsMsgBlock(pEntry->originalRpcType)) {
-      ASSERTS(false, "failed to append blocking msg");
+    if (code < 0) {
+      sNError(ths, "failed to append blocking msg");
     }
     return code;
   }
diff --git a/source/libs/sync/src/syncPipeline.c b/source/libs/sync/src/syncPipeline.c
index f2c86cef198068a2ff3a75a20f69e7009f9f0699..ef37600e98561ab9a3dd591aa79ae7a4b2d5d120 100644
--- a/source/libs/sync/src/syncPipeline.c
+++ b/source/libs/sync/src/syncPipeline.c
@@ -26,6 +26,11 @@
 #include "syncSnapshot.h"
 #include "syncUtil.h"
 
+static bool syncIsMsgBlock(tmsg_t type) {
+  return (type == TDMT_VND_CREATE_TABLE) || (type == TDMT_VND_ALTER_TABLE) || (type == TDMT_VND_DROP_TABLE) ||
+         (type == TDMT_VND_UPDATE_TAG_VAL) || (type == TDMT_VND_ALTER_CONFIRM);
+}
+
 int64_t syncLogBufferGetEndIndex(SSyncLogBuffer* pBuf) {
   taosThreadMutexLock(&pBuf->mutex);
   int64_t index = pBuf->endIndex;
@@ -441,26 +446,25 @@ _out:
   return matchIndex;
 }
 
-int32_t syncLogFsmExecute(SSyncNode* pNode, SSyncFSM* pFsm, ESyncState role, SyncTerm term, SSyncRaftEntry* pEntry) {
-  ASSERTS(pFsm->FpCommitCb != NULL, "No commit cb registered for the FSM");
-
+int32_t syncLogFsmExecute(SSyncNode* pNode, SSyncFSM* pFsm, ESyncState role, SyncTerm term, SSyncRaftEntry* pEntry,
+                          int32_t applyCode) {
   if ((pNode->replicaNum == 1) && pNode->restoreFinish && pNode->vgId != 1) {
     return 0;
   }
 
-  if (pNode->vgId != 1 && vnodeIsMsgBlock(pEntry->originalRpcType)) {
-    sTrace("vgId:%d, blocking msg ready to execute. index:%" PRId64 ", term: %" PRId64 ", type: %s", pNode->vgId,
-           pEntry->index, pEntry->term, TMSG_INFO(pEntry->originalRpcType));
+  if (pNode->vgId != 1 && syncIsMsgBlock(pEntry->originalRpcType)) {
+    sTrace("vgId:%d, blocking msg ready to execute, index:%" PRId64 ", term:%" PRId64 ", type:%s code:0x%x",
+           pNode->vgId, pEntry->index, pEntry->term, TMSG_INFO(pEntry->originalRpcType), applyCode);
   }
 
-  SRpcMsg rpcMsg = {0};
+  SRpcMsg rpcMsg = {.code = applyCode};
   syncEntry2OriginalRpc(pEntry, &rpcMsg);
 
   SFsmCbMeta cbMeta = {0};
   cbMeta.index = pEntry->index;
   cbMeta.lastConfigIndex = syncNodeGetSnapshotConfigIndex(pNode, pEntry->index);
   cbMeta.isWeak = pEntry->isWeak;
-  cbMeta.code = 0;
+  cbMeta.code = applyCode;
   cbMeta.state = role;
   cbMeta.seqNum = pEntry->seqNum;
   cbMeta.term = pEntry->term;
@@ -469,7 +473,6 @@ int32_t syncLogFsmExecute(SSyncNode* pNode, SSyncFSM* pFsm, ESyncState role, Syn
 
   (void)syncRespMgrGetAndDel(pNode->pSyncRespMgr, cbMeta.seqNum, &rpcMsg.info);
   int32_t code = pFsm->FpCommitCb(pFsm, &rpcMsg, &cbMeta);
-  ASSERT(rpcMsg.pCont == NULL);
   return code;
 }
 
@@ -520,7 +523,7 @@ int32_t syncLogBufferCommit(SSyncLogBuffer* pBuf, SSyncNode* pNode, int64_t comm
             pEntry->term, TMSG_INFO(pEntry->originalRpcType));
     }
 
-    if (syncLogFsmExecute(pNode, pFsm, role, term, pEntry) != 0) {
+    if (syncLogFsmExecute(pNode, pFsm, role, term, pEntry, 0) != 0) {
       sError("vgId:%d, failed to execute sync log entry. index:%" PRId64 ", term:%" PRId64
              ", role: %d, current term: %" PRId64,
              vgId, pEntry->index, pEntry->term, role, term);
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index 2d7121e2ae2b356c99d50b41764f62272ff66af8..ff61c7cdc4abaa79851a20f57ae214eeac3683c8 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -407,6 +407,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_SYN_STANDBY_NOT_READY,        "Sync not ready for st
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_BATCH_ERROR,              "Sync batch error")
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_RESTORING,                "Sync is restoring")
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_INVALID_SNAPSHOT_MSG,     "Sync invalid snapshot msg")
+TAOS_DEFINE_ERROR(TSDB_CODE_SYN_BUFFER_FULL,              "Sync buffer is full")
 TAOS_DEFINE_ERROR(TSDB_CODE_SYN_INTERNAL_ERROR,           "Sync internal error")
 
 //tq