diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index d16a599811255f987adb38cc553c8c5734a5ea60..d3e1416b858fb15b9bbf463569f78c7bd7b663f5 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -285,6 +285,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_TOPIC_SUBSCRIBED          TAOS_DEF_ERROR_CODE(0, 0x03EB)
 #define TSDB_CODE_MND_CGROUP_USED               TAOS_DEF_ERROR_CODE(0, 0x03EC)
 #define TSDB_CODE_MND_TOPIC_MUST_BE_DELETED     TAOS_DEF_ERROR_CODE(0, 0x03ED)
+#define TSDB_CODE_MND_IN_REBALANCE              TAOS_DEF_ERROR_CODE(0, 0x03EF)
 
 // mnode-stream
 #define TSDB_CODE_MND_STREAM_ALREADY_EXIST      TAOS_DEF_ERROR_CODE(0, 0x03F0)
diff --git a/source/dnode/mnode/impl/src/mndSubscribe.c b/source/dnode/mnode/impl/src/mndSubscribe.c
index 1452c5ae2fd3e9cde7cb9052d22e10bfd31afb0f..8a968712e085b989edb88967405c278ce9349899 100644
--- a/source/dnode/mnode/impl/src/mndSubscribe.c
+++ b/source/dnode/mnode/impl/src/mndSubscribe.c
@@ -900,6 +900,7 @@ int32_t mndDropSubByTopic(SMnode *pMnode, STrans *pTrans, const char *topicName)
     // iter all vnode to delete handle
     if (taosHashGetSize(pSub->consumerHash) != 0) {
       sdbRelease(pSdb, pSub);
+      terrno = TSDB_CODE_MND_IN_REBALANCE;
       return -1;
     }
     int32_t sz = taosArrayGetSize(pSub->unassignedVgs);
diff --git a/source/dnode/mnode/impl/src/mndTopic.c b/source/dnode/mnode/impl/src/mndTopic.c
index eb072d013d0024e5b05a172c3c3d5d55ce41cd40..7b36966d6c03cb5c3c2d2fe174bffcad340977b5 100644
--- a/source/dnode/mnode/impl/src/mndTopic.c
+++ b/source/dnode/mnode/impl/src/mndTopic.c
@@ -713,7 +713,6 @@ static int32_t mndProcessDropTopicReq(SRpcMsg *pReq) {
   mndReleaseTopic(pMnode, pTopic);
 
   if (code != 0) {
-    terrno = code;
     mError("topic:%s, failed to drop since %s", dropReq.name, terrstr());
     return -1;
   }
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index 044cdc86b4d91cbb26e00435cb241f39c0442f00..dbe8be6a81f5e91e8ea6e3d8338e6939f66113c3 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -288,6 +288,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_CONSUMER_NOT_READY,       "Consumer not ready")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOPIC_SUBSCRIBED,         "Topic subscribed cannot be dropped")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOPIC_MUST_BE_DELETED,    "Topic must be dropped first")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_CGROUP_USED,              "Consumer group being used by some consumer")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_IN_REBALANCE,             "Topic being rebalanced")
 
 // mnode-stream
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_STREAM_ALREADY_EXIST,     "Stream already exists")