fix: cant drop mnode which is offline

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

@@ -397,17 +397,17 @@ static int32_t mndProcessCreateMnodeReq(SRpcMsg *pReq) {
     goto _OVER;
   }
 
-  if (sdbGetSize(pMnode->pSdb, SDB_MNODE) >= 3) {
-    terrno = TSDB_CODE_MND_TOO_MANY_MNODES;
-    goto _OVER;
-  }
-
   pDnode = mndAcquireDnode(pMnode, createReq.dnodeId);
   if (pDnode == NULL) {
     terrno = TSDB_CODE_MND_DNODE_NOT_EXIST;
     goto _OVER;
   }
 
+  if (sdbGetSize(pMnode->pSdb, SDB_MNODE) >= 3) {
+    terrno = TSDB_CODE_MND_TOO_MANY_MNODES;
+    goto _OVER;
+  }
+
   if (!mndIsDnodeOnline(pDnode, taosGetTimestampMs())) {
     terrno = TSDB_CODE_NODE_OFFLINE;
     goto _OVER;
@@ -597,6 +597,11 @@ static int32_t mndProcessDropMnodeReq(SRpcMsg *pReq) {
     goto _OVER;
   }
 
+  if (!mndIsDnodeOnline(pObj->pDnode, taosGetTimestampMs())) {
+    terrno = TSDB_CODE_NODE_OFFLINE;
+    goto _OVER;
+  }
+
   pUser = mndAcquireUser(pMnode, pReq->conn.user);
   if (pUser == NULL) {
     terrno = TSDB_CODE_MND_NO_USER_FROM_CONN;

tests/script/jenkins/basic.txt

@@ -60,6 +60,7 @@
 ./test.sh -f tsim/mnode/basic2.sim
 ./test.sh -f tsim/mnode/basic3.sim
 ./test.sh -f tsim/mnode/basic4.sim
+./test.sh -f tsim/mnode/basic5.sim
 
 # ---- show
 ./test.sh -f tsim/show/basic.sim

tests/script/tsim/mnode/basic4.sim

@@ -118,8 +118,10 @@ endi
 
 print =============== step5: drop mnode 3 and stop dnode3
 system sh/exec.sh -n dnode3 -s stop
-sql_error drop mnode on dnode 3
+sleep 6000
-
+return
+sql drop mnode on dnode 3
+return
 $x = 0
 step5: 
 	$x = $x + 1

tests/script/tsim/mnode/basic5.sim

@@ -0,0 +1,109 @@
+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/exec.sh -n dnode1 -s start
+sql connect
+
+print =============== step1: create dnodes
+sql create dnode $hostname port 7200
+sql create dnode $hostname port 7300
+sql create dnode $hostname port 7400
+
+$x = 0
+step1: 
+	$x = $x + 1
+	sleep 1000
+	if $x == 5 then
+		return -1
+	endi
+sql show dnodes
+if $data(1)[4] != ready then
+  goto step1
+endi
+
+print =============== step2: create dnodes - with error
+sql_error create mnode on dnode 1;
+sql_error create mnode on dnode 2;
+sql_error create mnode on dnode 3;
+sql_error create mnode on dnode 4;
+sql_error create mnode on dnode 5;
+sql_error create mnode on dnode 6;
+
+print =============== step3: create mnode 2 and 3
+system sh/exec.sh -n dnode2 -s start
+system sh/exec.sh -n dnode3 -s start
+system sh/exec.sh -n dnode4 -s start
+$x = 0
+step3: 
+	$x = $x + 1
+	sleep 1000
+	if $x == 5 then
+		return -1
+	endi
+sql show dnodes
+if $data(2)[4] != ready then
+  goto step3
+endi
+if $data(3)[4] != ready then
+  goto step3
+endi
+if $data(4)[4] != ready then
+  goto step3
+endi
+
+sql create mnode on dnode 2
+sql create mnode on dnode 3
+
+$x = 0
+step31: 
+	$x = $x + 1
+	sleep 1000
+	if $x == 50 then
+		return -1
+	endi
+sql show mnodes
+if $data(1)[2] != leader then
+  goto step31
+endi
+if $data(2)[2] != follower then
+  goto step31
+endi
+if $data(3)[2] != follower then
+  goto step31
+endi
+
+print =============== step4: create dnodes - with error
+sql_error create mnode on dnode 1
+sql_error create mnode on dnode 2;
+sql_error create mnode on dnode 3;
+sql_error create mnode on dnode 4;
+sql_error create mnode on dnode 5;
+sql_error create mnode on dnode 6;
+
+print =============== step5: drop mnodes - with error
+sql_error drop mnode on dnode 1
+sql_error drop mnode on dnode 4
+sql_error drop mnode on dnode 5
+sql_error drop mnode on dnode 6
+
+system sh/exec.sh -n dnode2 -s stop
+$x = 0
+step5: 
+	$x = $x + 1
+	sleep 1000
+	if $x == 10 then
+		return -1
+	endi
+sql show dnodes
+if $data(2)[4] != offline then
+  goto step5
+endi
+
+sql_error drop mnode on dnode 2
+
+system sh/exec.sh -n dnode1 -s stop
+system sh/exec.sh -n dnode2 -s stop
+system sh/exec.sh -n dnode3 -s stop
+system sh/exec.sh -n dnode4 -s stop