diff --git a/src/kit/taosdump/taosdump.c b/src/kit/taosdump/taosdump.c
index 63cdf259d642fb47a33e2022cb8141f246aafc96..0b1890c5abc47159b267c4481a98d25422817d3b 100644
--- a/src/kit/taosdump/taosdump.c
+++ b/src/kit/taosdump/taosdump.c
@@ -911,21 +911,27 @@ int32_t taosDumpMetric(char *metric, SDumpArguments *arguments, FILE *fp) {
 
   (void)lseek(fd, 0, SEEK_SET);
 
-  STableRecord tableInfo;
+  //STableRecord tableInfo;
   char tableName[TSDB_TABLE_NAME_LEN] ;
   char metricName[TSDB_TABLE_NAME_LEN];
-  while (1) {    
-    memset(&tableInfo, 0, sizeof(STableRecord));      
+  ssize_t ret;
+  while (1) {
+    //memset(&tableInfo, 0, sizeof(STableRecord));      
     memset(tableName, 0, TSDB_TABLE_NAME_LEN);    
     memset(metricName, 0, TSDB_TABLE_NAME_LEN);
-    ssize_t ret = read(fd, &tableInfo, sizeof(STableRecord));
+    //ssize_t ret = read(fd, &tableInfo, sizeof(STableRecord));
+    //if (ret <= 0) break;
+    ret = read(fd, tableName, TSDB_TABLE_NAME_LEN);
+    if (ret <= 0) break;
+    
+    ret = read(fd, metricName, TSDB_TABLE_NAME_LEN);
     if (ret <= 0) break;
     
     //tableInfo.name[sizeof(tableInfo.name) - 1] = 0;
     //tableInfo.metric[sizeof(tableInfo.metric) - 1] = 0;    
     //taosDumpTable(tableInfo.name, tableInfo.metric, arguments, fp);
-    tstrncpy(tableName, tableInfo.name, TSDB_TABLE_NAME_LEN-1);
-    tstrncpy(metricName, tableInfo.metric, TSDB_TABLE_NAME_LEN-1);
+    //tstrncpy(tableName, tableInfo.name, TSDB_TABLE_NAME_LEN-1);
+    //tstrncpy(metricName, tableInfo.metric, TSDB_TABLE_NAME_LEN-1);
     taosDumpTable(tableName, metricName, arguments, fp);
   }
 
diff --git a/src/util/src/hash.c b/src/util/src/hash.c
index 1de013c416ca25080bb6edaf00a93cb324bf3668..4ad06791a61204f7a16f9aab3351c1dd24f3a453 100644
--- a/src/util/src/hash.c
+++ b/src/util/src/hash.c
@@ -468,7 +468,8 @@ void taosHashTableResize(SHashObj *pHashObj) {
     return;
   }
 
-  void *pNewEntry = realloc(pHashObj->hashList, POINTER_BYTES * newSize);
+  int32_t pointerSize = POINTER_BYTES;
+  void *pNewEntry = realloc(pHashObj->hashList, pointerSize * newSize);
   if (pNewEntry == NULL) {// todo handle error
 //    uTrace("cache resize failed due to out of memory, capacity remain:%d", pHashObj->capacity);
     return;
diff --git a/src/util/src/ttime.c b/src/util/src/ttime.c
index 5feda312b1e3c51c45f728d0811614b219e9055f..dfec6320121e67dc0d0f2907f03669e50f67895f 100644
--- a/src/util/src/ttime.c
+++ b/src/util/src/ttime.c
@@ -56,8 +56,13 @@ int64_t user_mktime64(const unsigned int year0, const unsigned int mon0,
 		year -= 1;
 	}
 
-  int64_t res = (((((int64_t) (year/4 - year/100 + year/400 + (int64_t)(367*mon)/12 + day) +
-		  year*365 - 719499)*24 + hour)*60 + min)*60 + sec);
+  //int64_t res = (((((int64_t) (year/4 - year/100 + year/400 + 367*mon/12 + day) +
+	//	  year*365 - 719499)*24 + hour)*60 + min)*60 + sec);
+  int64_t res;
+  res  = 367*((int64_t)mon)/12;
+  res += year/4 - year/100 + year/400 + day + year*365 - 719499;
+  res  = res*24;
+  res  = ((res + hour) * 60 + min) * 60 + sec;  
 
 	return (res + timezone);
 }
diff --git a/tests/script/unique/arbitrator/sync_replica3_createTable.sim b/tests/script/unique/arbitrator/sync_replica3_createTable.sim
new file mode 100644
index 0000000000000000000000000000000000000000..1b93cc09f2f3550aeb8efa7593f4d943d47fc7c6
--- /dev/null
+++ b/tests/script/unique/arbitrator/sync_replica3_createTable.sim
@@ -0,0 +1,211 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/deploy.sh -n dnode2 -i 2
+system sh/deploy.sh -n dnode3 -i 3
+system sh/deploy.sh -n dnode4 -i 4
+
+system sh/cfg.sh -n dnode1 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode2 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode3 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode4 -c numOfMnodes -v 1
+
+system sh/cfg.sh -n dnode1 -c walLevel -v 2
+system sh/cfg.sh -n dnode2 -c walLevel -v 2
+system sh/cfg.sh -n dnode3 -c walLevel -v 2
+system sh/cfg.sh -n dnode4 -c walLevel -v 2
+
+system sh/cfg.sh -n dnode1 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode2 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode3 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode4 -c balanceInterval -v 10
+
+system sh/cfg.sh -n dnode1 -c numOfTotalVnodes -v 4
+system sh/cfg.sh -n dnode2 -c numOfTotalVnodes -v 4
+system sh/cfg.sh -n dnode3 -c numOfTotalVnodes -v 4
+system sh/cfg.sh -n dnode4 -c numOfTotalVnodes -v 4
+
+system sh/cfg.sh -n dnode1 -c alternativeRole -v 1
+system sh/cfg.sh -n dnode2 -c alternativeRole -v 2
+system sh/cfg.sh -n dnode3 -c alternativeRole -v 2
+system sh/cfg.sh -n dnode4 -c alternativeRole -v 2
+
+system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxtablesPerVnode -v 4
+
+system sh/cfg.sh -n dnode1 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode2 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode3 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode4 -c arbitrator -v $arbitrator
+
+print ============== step0: start tarbitrator
+system sh/exec_tarbitrator.sh -s start
+
+print ============== step1: start dnode1, only deploy mnode
+system sh/exec.sh -n dnode1 -s start
+sleep 3000
+sql connect
+
+print ============== step2: start dnode2/dnode3/dnode4 and add into cluster , then create database with replica 3, and create table, insert data
+system sh/exec.sh -n dnode2 -s start
+system sh/exec.sh -n dnode3 -s start
+system sh/exec.sh -n dnode4 -s start
+sql create dnode $hostname2
+sql create dnode $hostname3
+sql create dnode $hostname4
+sleep 3000
+
+$totalTableNum = 20
+$sleepTimer = 3000
+
+$db = db
+print create database $db replica 3 maxTables $totalTableNum
+sql create database $db replica 3 maxTables $totalTableNum
+sql use $db
+
+# create table , insert data
+$stb = stb
+sql create table $stb (ts timestamp, c1 int) tags(t1 int)
+$rowNum = 500
+$tblNum = 10
+$totalRows = 0
+$tsStart = 1420041600000
+$tsEnd = 0
+
+$i = 0
+while $i < $tblNum
+  $tb = tb . $i
+  sql create table $tb using $stb tags( $i )
+ 
+  $x = 0
+  while $x < $rowNum
+    $ts = $tsStart + $x
+    sql insert into $tb values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x ) ( $ts + 10a , $x ) ( $ts + 11a , $x ) ( $ts + 12a , $x ) ( $ts + 13a , $x ) ( $ts + 14a , $x ) ( $ts + 15a , $x ) ( $ts + 16a , $x ) ( $ts + 17a , $x ) ( $ts + 18a , $x ) ( $ts + 19a , $x ) ( $ts + 20a , $x ) ( $ts + 21a , $x ) ( $ts + 22a , $x ) ( $ts + 23a , $x ) ( $ts + 24a , $x ) ( $ts + 25a , $x ) ( $ts + 26a , $x ) ( $ts + 27a , $x ) ( $ts + 28a , $x ) ( $ts + 29a , $x ) ( $ts + 30a , $x ) ( $ts + 31a , $x ) ( $ts + 32a , $x ) ( $ts + 33a , $x ) ( $ts + 34a , $x ) ( $ts + 25a , $x ) ( $ts + 26a , $x ) ( $ts + 27a , $x ) ( $ts + 28a , $x ) ( $ts + 29a , $x ) ( $ts + 30a , $x ) ( $ts + 31a , $x ) ( $ts + 32a , $x ) ( $ts + 33a , $x ) ( $ts + 34a , $x ) ( $ts + 35a , $x ) ( $ts + 36a , $x ) ( $ts + 37a , $x ) ( $ts + 38a , $x ) ( $ts + 39a , $x ) ( $ts + 40a , $x ) ( $ts + 41a , $x ) ( $ts + 42a , $x ) ( $ts + 43a , $x ) ( $ts + 44a , $x ) ( $ts + 45a , $x ) ( $ts + 46a , $x ) ( $ts + 47a , $x ) ( $ts + 48a , $x ) ( $ts + 49a , $x ) ( $ts + 50a , $x ) ( $ts + 51a , $x ) ( $ts + 52a , $x ) ( $ts + 53a , $x ) ( $ts + 54a , $x ) ( $ts + 55a , $x ) ( $ts + 56a , $x ) ( $ts + 57a , $x ) ( $ts + 58a , $x ) ( $ts + 59a , $x ) 
+    $x = $x + 60
+  endw 
+  $totalRows = $totalRows + $x
+  print       info: inserted $x rows into $tb and totalRows: $totalRows
+  $i = $i + 1
+endw 
+$tsEnd = $tsStart + $totalRows / $tblNum
+
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+print ============== step3: stop dnode4 
+system sh/exec.sh -n dnode4 -s stop -x SIGINT
+sleep $sleepTimer
+$cnt = 0
+wait_dnode4_offline_0:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show dnodes
+if $rows != 4 then
+  sleep 2000
+  goto wait_dnode4_offline_0
+endi
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3
+#print $data0_4  $data1_4  $data2_4  $data3_4  $data4_4
+#print $data0_5  $data1_5  $data2_5  $data3_5  $data4_5
+#print $data0_6  $data1_6  $data2_6  $data3_6  $data4_6
+#$dnode1Status = $data4_1  
+$dnode2Status = $data4_2
+$dnode3Status = $data4_3  
+$dnode4Status = $data4_4 
+#$dnode5Status = $data4_5
+
+if $dnode4Status != offline then
+  sleep 2000
+  goto wait_dnode4_offline_0
+endi
+
+$cnt = 0
+wait_dnode4_vgroup_offline:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_offline
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != offline then
+  sleep 2000
+  goto wait_dnode4_vgroup_offline
+endi
+if $dnode3Vtatus != master then
+  sleep 2000
+  goto wait_dnode4_vgroup_offline
+endi
+
+print ============== step4: insert more data rows
+$tsStart = $tsEnd + 1000
+$i = 0
+while $i < $tblNum
+  $tb = tb . $i
+ 
+  $x = 0
+  while $x < $rowNum
+    $ts = $tsStart + $x
+    sql insert into $tb values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x ) ( $ts + 10a , $x ) ( $ts + 11a , $x ) ( $ts + 12a , $x ) ( $ts + 13a , $x ) ( $ts + 14a , $x ) ( $ts + 15a , $x ) ( $ts + 16a , $x ) ( $ts + 17a , $x ) ( $ts + 18a , $x ) ( $ts + 19a , $x ) ( $ts + 20a , $x ) ( $ts + 21a , $x ) ( $ts + 22a , $x ) ( $ts + 23a , $x ) ( $ts + 24a , $x ) ( $ts + 25a , $x ) ( $ts + 26a , $x ) ( $ts + 27a , $x ) ( $ts + 28a , $x ) ( $ts + 29a , $x ) ( $ts + 30a , $x ) ( $ts + 31a , $x ) ( $ts + 32a , $x ) ( $ts + 33a , $x ) ( $ts + 34a , $x ) ( $ts + 25a , $x ) ( $ts + 26a , $x ) ( $ts + 27a , $x ) ( $ts + 28a , $x ) ( $ts + 29a , $x ) ( $ts + 30a , $x ) ( $ts + 31a , $x ) ( $ts + 32a , $x ) ( $ts + 33a , $x ) ( $ts + 34a , $x ) ( $ts + 35a , $x ) ( $ts + 36a , $x ) ( $ts + 37a , $x ) ( $ts + 38a , $x ) ( $ts + 39a , $x ) ( $ts + 40a , $x ) ( $ts + 41a , $x ) ( $ts + 42a , $x ) ( $ts + 43a , $x ) ( $ts + 44a , $x ) ( $ts + 45a , $x ) ( $ts + 46a , $x ) ( $ts + 47a , $x ) ( $ts + 48a , $x ) ( $ts + 49a , $x ) ( $ts + 50a , $x ) ( $ts + 51a , $x ) ( $ts + 52a , $x ) ( $ts + 53a , $x ) ( $ts + 54a , $x ) ( $ts + 55a , $x ) ( $ts + 56a , $x ) ( $ts + 57a , $x ) ( $ts + 58a , $x ) ( $ts + 59a , $x ) 
+    $x = $x + 60
+  endw 
+  $totalRows = $totalRows + $x
+  print       info: inserted $x rows into $tb and totalRows: $totalRows
+  $i = $i + 1
+endw 
+
+sql select count(*) from $stb
+print data00:$data00   totalRows:$totalRows 
+if $data00 != $totalRows then
+	return -1
+endi
+
+print ============== step5: restart dnode4, while alter table and insert data in other thead when dnode4 is syncing
+system sh/exec.sh -n dnode4 -s start
+run_back unique/arbitrator/sync_replica_createTable_background_add.sim
+
+print ============== step6: check result
+#in background.sim, add 10 tables and insert 100 rows
+$totalRows = $totalRows + 100
+
+$cnt = 0
+wait_table_created:
+$cnt = $cnt + 1
+if $cnt == 20 then
+  return -1
+endi
+
+sql show tables
+if $rows != $totalTableNum then
+  print rows:$rows   totalTableNum:$totalTableNum 
+	sleep 2000
+	goto wait_table_created
+endi
+
+sql select count(*) from $stb
+if $data00 != $totalRows then
+  print data00:$data00   totalRows:$totalRows 
+	sleep 2000
+	goto wait_table_created
+endi
+
+
+
+
diff --git a/tests/script/unique/arbitrator/sync_replica3_dnodeChang_DropAddAlterTableDropDb.sim b/tests/script/unique/arbitrator/sync_replica3_dnodeChang_DropAddAlterTableDropDb.sim
new file mode 100644
index 0000000000000000000000000000000000000000..e092eec20503271b88c96605dc9dc91bceed6a3c
--- /dev/null
+++ b/tests/script/unique/arbitrator/sync_replica3_dnodeChang_DropAddAlterTableDropDb.sim
@@ -0,0 +1,484 @@
+system sh/stop_dnodes.sh
+system sh/deploy.sh -n dnode1 -i 1
+system sh/deploy.sh -n dnode2 -i 2
+system sh/deploy.sh -n dnode3 -i 3
+system sh/deploy.sh -n dnode4 -i 4
+
+system sh/cfg.sh -n dnode1 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode2 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode3 -c numOfMnodes -v 1
+system sh/cfg.sh -n dnode4 -c numOfMnodes -v 1
+
+system sh/cfg.sh -n dnode1 -c walLevel -v 2
+system sh/cfg.sh -n dnode2 -c walLevel -v 2
+system sh/cfg.sh -n dnode3 -c walLevel -v 2
+system sh/cfg.sh -n dnode4 -c walLevel -v 2
+
+system sh/cfg.sh -n dnode1 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode2 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode3 -c balanceInterval -v 10
+system sh/cfg.sh -n dnode4 -c balanceInterval -v 10
+
+system sh/cfg.sh -n dnode1 -c numOfTotalVnodes -v 4
+system sh/cfg.sh -n dnode2 -c numOfTotalVnodes -v 4
+system sh/cfg.sh -n dnode3 -c numOfTotalVnodes -v 4
+system sh/cfg.sh -n dnode4 -c numOfTotalVnodes -v 4
+
+system sh/cfg.sh -n dnode1 -c alternativeRole -v 1
+system sh/cfg.sh -n dnode2 -c alternativeRole -v 2
+system sh/cfg.sh -n dnode3 -c alternativeRole -v 2
+system sh/cfg.sh -n dnode4 -c alternativeRole -v 2
+
+system sh/cfg.sh -n dnode1 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode2 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode3 -c maxtablesPerVnode -v 4
+system sh/cfg.sh -n dnode4 -c maxtablesPerVnode -v 4
+
+system sh/cfg.sh -n dnode1 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode2 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode3 -c arbitrator -v $arbitrator
+system sh/cfg.sh -n dnode4 -c arbitrator -v $arbitrator
+
+print ============== step0: start tarbitrator
+system sh/exec_tarbitrator.sh -s start
+
+print ============== step1: start dnode1, only deploy mnode
+system sh/exec.sh -n dnode1 -s start
+sleep 3000
+sql connect
+
+print ============== step2: start dnode2/dnode3/dnode4 and add into cluster , then create database with replica 3, and create table, insert data
+system sh/exec.sh -n dnode2 -s start
+system sh/exec.sh -n dnode3 -s start
+system sh/exec.sh -n dnode4 -s start
+sql create dnode $hostname2
+sql create dnode $hostname3
+sql create dnode $hostname4
+sleep 3000
+
+$totalTableNum = 20
+$sleepTimer = 3000
+
+$db = db
+print create database $db replica 3 maxTables $totalTableNum
+sql create database $db replica 3 maxTables $totalTableNum
+sql use $db
+
+# create table , insert data
+$stb = stb
+sql create table $stb (ts timestamp, c1 int) tags(t1 int)
+$rowNum = 500
+$tblNum = 10
+$totalRows = 0
+$tsStart = 1420041600000
+$tsEnd = 0
+
+$i = 0
+while $i < $tblNum
+  $tb = tb . $i
+  sql create table $tb using $stb tags( $i )
+ 
+  $x = 0
+  $ts = $tsStart + $x
+  sql insert into $tb values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+  $x = $x + 10
+
+  $totalRows = $totalRows + $x
+  print       info: inserted $x rows into $tb and totalRows: $totalRows
+  $i = $i + 1
+endw 
+$tsEnd = $tsStart + $totalRows / $tblNum
+
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+print ============== step3: stop dnode4 
+system sh/exec.sh -n dnode4 -s stop -x SIGINT
+$cnt = 0
+wait_dnode4_offline_0:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show dnodes
+if $rows != 4 then
+  sleep 2000
+  goto wait_dnode4_offline_0
+endi
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3
+print $data0_4  $data1_4  $data2_4  $data3_4  $data4_4
+$dnode1Status = $data4_1  
+$dnode2Status = $data4_2
+$dnode3Status = $data4_3  
+$dnode4Status = $data4_4 
+
+if $dnode4Status != offline then
+  sleep 2000
+  goto wait_dnode4_offline_0
+endi
+
+$cnt = 0
+wait_dnode4_vgroup_offline:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_offline
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != offline then
+  sleep 2000
+  goto wait_dnode4_vgroup_offline
+endi
+if $dnode3Vtatus != master then
+  sleep 2000
+  goto wait_dnode4_vgroup_offline
+endi
+
+print ============== step4: drop some tables
+sql drop table tb0
+sql drop table tb9
+sql drop table tb1
+sql drop table tb8
+
+$totalRows = $totalRows - 40
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+print ============== step5: restart dnode4, waiting sync end
+system sh/exec.sh -n dnode4 -s start
+
+$cnt = 0
+wait_dnode4_ready:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show dnodes
+if $rows != 4 then
+  sleep 2000
+  goto wait_dnode4_ready
+endi
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3
+print $data0_4  $data1_4  $data2_4  $data3_4  $data4_4
+$dnode1Status = $data4_1  
+$dnode2Status = $data4_2
+$dnode3Status = $data4_3  
+$dnode4Status = $data4_4 
+
+if $dnode4Status != ready then
+  sleep 2000
+  goto wait_dnode4_ready
+endi
+
+$cnt = 0
+wait_dnode4_vgroup_slave:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_slave
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != slave then
+  sleep 2000
+  goto wait_dnode4_vgroup_slave
+endi
+
+print ============== step6: stop dnode2/dnode3 and remove their data dir, and restart dnode2/dnode3
+system sh/exec.sh -n dnode2 -s stop -x SIGINT
+system sh/exec.sh -n dnode3 -s stop -x SIGINT
+sleep 1000
+system rm -rf ../../../sim/dnode2/data
+system rm -rf ../../../sim/dnode3/data
+
+system sh/exec.sh -n dnode2 -s start
+system sh/exec.sh -n dnode3 -s start
+
+$cnt = 0
+wait_dnode4_vgroup_master:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_master
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != master then
+  sleep 2000
+  goto wait_dnode4_vgroup_master
+endi
+
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+
+print ============== step7: stop dnode4 and create some new tables
+system sh/exec.sh -n dnode4 -s stop -x SIGINT
+
+$ts = $tsStart
+sql insert into tb10 using stb tags(10) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb11 using stb tags(11) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb12 using stb tags(12) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb13 using stb tags(13) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+  
+$totalRows = $totalRows + 40
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+print ============== step8: restart dnode4, waiting sync end
+system sh/exec.sh -n dnode4 -s start
+
+$cnt = 0
+wait_dnode4_ready_2:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show dnodes
+if $rows != 4 then
+  sleep 2000
+  goto wait_dnode4_ready_2
+endi
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3
+print $data0_4  $data1_4  $data2_4  $data3_4  $data4_4
+$dnode1Status = $data4_1  
+$dnode2Status = $data4_2
+$dnode3Status = $data4_3  
+$dnode4Status = $data4_4 
+
+if $dnode4Status != ready then
+  sleep 2000
+  goto wait_dnode4_ready_2
+endi
+
+$cnt = 0
+wait_dnode4_vgroup_slave_2:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_slave_2
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != slave then
+  sleep 2000
+  goto wait_dnode4_vgroup_slave_2
+endi
+
+print ============== step9: stop dnode2/dnode3 and remove their data dir, and restart dnode2/dnode3
+system sh/exec.sh -n dnode2 -s stop -x SIGINT
+system sh/exec.sh -n dnode3 -s stop -x SIGINT
+sleep 1000
+system rm -rf ../../../sim/dnode2/data
+system rm -rf ../../../sim/dnode3/data
+
+system sh/exec.sh -n dnode2 -s start
+system sh/exec.sh -n dnode3 -s start
+
+$cnt = 0
+wait_dnode4_vgroup_master_2:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_master_2
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != master then
+  sleep 2000
+  goto wait_dnode4_vgroup_master_2
+endi
+
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+
+print ============== step10: stop dnode4 and alter table column
+system sh/exec.sh -n dnode4 -s stop -x SIGINT
+
+sql alter table stb add column c2 int
+sql alter table stb add column c3 int
+sql alter table stb add column c4 int
+sql alter table stb drop column c1
+
+sql alter table stb add tag t2 int
+sql alter table stb add tag t3 int
+sql alter table stb add tag t4 int
+sql_error alter table stb drop tag t1
+
+$ts = $tsEnd + 10000
+sql insert into tb2 values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb3 values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb4 values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb5 values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+
+
+$ts = $tsStart
+sql insert into tb14 using stb tags(14) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb15 using stb tags(15) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb16 using stb tags(16) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+sql insert into tb17 using stb tags(17) values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+  
+$totalRows = $totalRows + 80
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
+
+print ============== step11: restart dnode4, waiting sync end
+system sh/exec.sh -n dnode4 -s start
+
+$cnt = 0
+wait_dnode4_ready_3:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show dnodes
+if $rows != 4 then
+  sleep 2000
+  goto wait_dnode4_ready_3
+endi
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3
+print $data0_4  $data1_4  $data2_4  $data3_4  $data4_4
+$dnode1Status = $data4_1  
+$dnode2Status = $data4_2
+$dnode3Status = $data4_3  
+$dnode4Status = $data4_4 
+
+if $dnode4Status != ready then
+  sleep 2000
+  goto wait_dnode4_ready_3
+endi
+
+$cnt = 0
+wait_dnode4_vgroup_slave_3:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_slave_3
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != slave then
+  sleep 2000
+  goto wait_dnode4_vgroup_slave_3
+endi
+
+print ============== step12: stop dnode2/dnode3 and remove their data dir, and restart dnode2/dnode3
+system sh/exec.sh -n dnode2 -s stop -x SIGINT
+system sh/exec.sh -n dnode3 -s stop -x SIGINT
+sleep 1000
+system rm -rf ../../../sim/dnode2/data
+system rm -rf ../../../sim/dnode3/data
+
+system sh/exec.sh -n dnode2 -s start
+system sh/exec.sh -n dnode3 -s start
+
+$cnt = 0
+wait_dnode4_vgroup_master_3:
+$cnt = $cnt + 1
+if $cnt == 10 then
+  return -1
+endi
+sql show vgroups
+if $rows != 1 then
+  sleep 2000
+  goto wait_dnode4_vgroup_master_3
+endi
+print show vgroups:
+print $data0_1  $data1_1  $data2_1  $data3_1  $data4_1  $data5_1  $data6_1  $data7_1  $data8_1  $data9_1
+print $data0_2  $data1_2  $data2_2  $data3_2  $data4_2  $data5_2  $data6_2  $data7_2  $data8_2  $data9_2
+print $data0_3  $data1_3  $data2_3  $data3_3  $data4_3  $data5_3  $data6_3  $data7_3  $data8_3  $data9_3
+$dnode4Vtatus = $data4_2
+$dnode3Vtatus = $data7_2
+
+if $dnode4Vtatus != master then
+  sleep 2000
+  goto wait_dnode4_vgroup_master_3
+endi
+
+sql select count(*) from $stb
+print data00 $data00
+if $data00 != $totalRows then
+	return -1
+endi
diff --git a/tests/script/unique/arbitrator/sync_replica_createTable_background_add.sim b/tests/script/unique/arbitrator/sync_replica_createTable_background_add.sim
new file mode 100644
index 0000000000000000000000000000000000000000..50893b58a6125cfa3ae15e0472b78538f2c9256e
--- /dev/null
+++ b/tests/script/unique/arbitrator/sync_replica_createTable_background_add.sim
@@ -0,0 +1,32 @@
+sql connect
+
+$db = db
+$stb = stb
+print =============== sync_replica_createTable_background_add.sim step0: create table and insert data
+$totalTableNum = 10
+
+sql use $db
+
+#sql create table $stb (ts timestamp, c1 int) tags(t1 int)
+# create table , insert data
+#$rowNum = 500
+$tblNum = 20
+$totalRows = 100
+$tsStart = 1420141600000
+$tsEnd = 0
+
+$i = 10
+while $i < $tblNum
+  $tb = tb . $i
+  sql create table $tb using $stb tags( $i )
+ 
+  $x = 10
+  $ts = $tsStart + $x
+  sql insert into $tb values ( $ts + 0a , $x ) ( $ts + 1a , $x ) ( $ts + 2a , $x ) ( $ts + 3a , $x ) ( $ts + 4a , $x ) ( $ts + 5a , $x ) ( $ts + 6a , $x ) ( $ts + 7a , $x ) ( $ts + 8a , $x ) ( $ts + 9a , $x )
+
+  $totalRows = $totalRows + $x
+  print       info: inserted $x rows into $tb and totalRows: $totalRows
+  $i = $i + 1
+endw 
+
+
diff --git a/tests/script/unique/arbitrator/testSuite.sim b/tests/script/unique/arbitrator/testSuite.sim
index b6678633276aa3bc7f22c325fede37a8660d3f9c..127a320e53db686a8109505d3299715edaa262e4 100644
--- a/tests/script/unique/arbitrator/testSuite.sim
+++ b/tests/script/unique/arbitrator/testSuite.sim
@@ -31,6 +31,8 @@ run unique/arbitrator/offline_replica3_dropTable_online.sim
 run unique/arbitrator/replica_changeWithArbitrator.sim
 run unique/arbitrator/sync_replica2_alterTable_add.sim
 run unique/arbitrator/sync_replica2_alterTable_drop.sim
+run unique/arbitrator/sync_replica3_createTable.sim
+run unique/arbitrator/sync_replica3_dnodeChang_DropAddAlterTableDropDb.sim
 run unique/arbitrator/sync_replica2_dropDb.sim
 run unique/arbitrator/sync_replica2_dropTable.sim
 run unique/arbitrator/sync_replica3_alterTable_add.sim