refactor: adjust error msg

include/util/taoserror.h

@@ -183,8 +183,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_MND_BNODE_NOT_EXIST           TAOS_DEF_ERROR_CODE(0, 0x0357)
 #define TSDB_CODE_MND_TOO_FEW_MNODES            TAOS_DEF_ERROR_CODE(0, 0x0358)
 #define TSDB_CODE_MND_TOO_MANY_MNODES           TAOS_DEF_ERROR_CODE(0, 0x0359)
-#define TSDB_CODE_MND_MNODE_DEPLOYED            TAOS_DEF_ERROR_CODE(0, 0x035A)
-#define TSDB_CODE_MND_CANT_DROP_MASTER          TAOS_DEF_ERROR_CODE(0, 0x035B)
+#define TSDB_CODE_MND_CANT_DROP_MASTER          TAOS_DEF_ERROR_CODE(0, 0x035A)
 
 // mnode-acct
 #define TSDB_CODE_MND_ACCT_ALREADY_EXIST        TAOS_DEF_ERROR_CODE(0, 0x0360)

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

@@ -613,7 +613,7 @@ static int32_t mndProcessDropDnodeReq(SRpcMsg *pReq) {
 
   pMObj = mndAcquireMnode(pMnode, dropReq.dnodeId);
   if (pMObj != NULL) {
-    terrno = TSDB_CODE_MND_MNODE_DEPLOYED;
+    terrno = TSDB_CODE_MND_MNODE_NOT_EXIST;
     goto DROP_DNODE_OVER;
   }
 

source/util/src/terror.c

@@ -186,10 +186,9 @@ TAOS_DEFINE_ERROR(TSDB_CODE_MND_SNODE_ALREADY_EXIST,      "Snode already exists"
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_SNODE_NOT_EXIST,          "Snode not there")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_BNODE_ALREADY_EXIST,      "Bnode already exists")
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_BNODE_NOT_EXIST,          "Bnode not there")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_FEW_MNODES,           "Too few mnodes")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_MNODES,          "Too many mnodes")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_MNODE_DEPLOYED,           "Mnode deployed in this dnode")
-TAOS_DEFINE_ERROR(TSDB_CODE_MND_CANT_DROP_MASTER,         "Can't drop mnode which is master")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_FEW_MNODES,           "The replicas of mnode cannot less than 1")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_TOO_MANY_MNODES,          "The replicas of mnode cannot exceed 3")
+TAOS_DEFINE_ERROR(TSDB_CODE_MND_CANT_DROP_MASTER,         "Can't drop mnode which is LEADER")
 
 // mnode-acct
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_ACCT_ALREADY_EXIST,       "Account already exists")