fix: check dup rebalance

source/dnode/mnode/impl/src/mndConsumer.c

@@ -836,10 +836,13 @@ static int32_t mndConsumerActionUpdate(SSdb *pSdb, SMqConsumerObj *pOldConsumer,
 
     char *addedTopic = strdup(taosArrayGetP(pNewConsumer->rebNewTopics, 0));
     // not exist in current topic
+    bool existing = false;
 #if 1
     for (int32_t i = 0; i < taosArrayGetSize(pOldConsumer->currentTopics); i++) {
       char *topic = taosArrayGetP(pOldConsumer->currentTopics, i);
-      ASSERT(strcmp(topic, addedTopic) != 0);
+      if (strcmp(topic, addedTopic) == 0) {
+        existing = true;
+      }
     }
 #endif
 
@@ -854,8 +857,10 @@ static int32_t mndConsumerActionUpdate(SSdb *pSdb, SMqConsumerObj *pOldConsumer,
     }
 
     // add to current topic
-    taosArrayPush(pOldConsumer->currentTopics, &addedTopic);
-    taosArraySort(pOldConsumer->currentTopics, taosArrayCompareString);
+    if (!existing) {
+      taosArrayPush(pOldConsumer->currentTopics, &addedTopic);
+      taosArraySort(pOldConsumer->currentTopics, taosArrayCompareString);
+    }
 
     // set status
     if (taosArrayGetSize(pOldConsumer->rebNewTopics) == 0 && taosArrayGetSize(pOldConsumer->rebRemovedTopics) == 0) {