check offline when force

include/util/taoserror.h

@@ -409,6 +409,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MNODE_ALREADY_IS_VOTER        TAOS_DEF_ERROR_CODE(0, 0x0413) // internal
 #define TSDB_CODE_MNODE_ONLY_TWO_MNODE          TAOS_DEF_ERROR_CODE(0, 0x0414) // internal
 #define TSDB_CODE_MNODE_NO_NEED_RESTORE         TAOS_DEF_ERROR_CODE(0, 0x0415) // internal
+#define TSDB_CODE_DNODE_ONLY_USE_WHEN_OFFLINE   TAOS_DEF_ERROR_CODE(0, 0x0416)
 
 // vnode
 // #define TSDB_CODE_VND_ACTION_IN_PROGRESS     TAOS_DEF_ERROR_CODE(0, 0x0500) // 2.x

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

@@ -986,8 +986,15 @@ static int32_t mndProcessDropDnodeReq(SRpcMsg *pReq) {
   }
 
   int32_t numOfVnodes = mndGetVnodesNum(pMnode, pDnode->id);
-  if ((numOfVnodes > 0 || pMObj != NULL || pSObj != NULL || pQObj != NULL) && !force) {
-    if (!mndIsDnodeOnline(pDnode, taosGetTimestampMs())) {
+  if (numOfVnodes > 0 || pMObj != NULL || pSObj != NULL || pQObj != NULL) {
+    bool isonline = mndIsDnodeOnline(pDnode, taosGetTimestampMs());
+    if (isonline && force) {
+      terrno = TSDB_CODE_DNODE_ONLY_USE_WHEN_OFFLINE;
+      mError("dnode:%d, failed to drop since %s, vnodes:%d mnode:%d qnode:%d snode:%d", pDnode->id, terrstr(),
+             numOfVnodes, pMObj != NULL, pQObj != NULL, pSObj != NULL);
+      goto _OVER;
+    }
+    if (!isonline && !force) {
       terrno = TSDB_CODE_DNODE_OFFLINE;
       mError("dnode:%d, failed to drop since %s, vnodes:%d mnode:%d qnode:%d snode:%d", pDnode->id, terrstr(),
              numOfVnodes, pMObj != NULL, pQObj != NULL, pSObj != NULL);

source/util/src/terror.c

@@ -325,6 +325,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MNODE_NOT_CATCH_UP,           "Mnode didn't catch th
 TAOS_DEFINE_ERROR(TSDB_CODE_MNODE_ALREADY_IS_VOTER,       "Mnode already is a leader")
 TAOS_DEFINE_ERROR(TSDB_CODE_MNODE_ONLY_TWO_MNODE,         "Only two mnodes exist")
 TAOS_DEFINE_ERROR(TSDB_CODE_MNODE_NO_NEED_RESTORE,        "No need to restore on this dnode")
+TAOS_DEFINE_ERROR(TSDB_CODE_DNODE_ONLY_USE_WHEN_OFFLINE,  "Please use this command when the dnode is offline")
 
 // vnode
 TAOS_DEFINE_ERROR(TSDB_CODE_VND_INVALID_VGROUP_ID,        "Vnode is closed or removed")