diff --git a/include/util/tdef.h b/include/util/tdef.h
index 64a169b4f1..5edd0549f0 100644
--- a/include/util/tdef.h
+++ b/include/util/tdef.h
@@ -204,7 +204,7 @@ do { \
 
 #define TSDB_CLUSTER_ID_LEN       40
 #define TSDB_FQDN_LEN             128
-#define TSDB_EP_LEN               (TSDB_FQDN_LEN+6)
+#define TSDB_EP_LEN               (TSDB_FQDN_LEN + 6)
 #define TSDB_IPv4ADDR_LEN      	  16
 #define TSDB_FILENAME_LEN         128
 #define TSDB_SHOW_SQL_LEN         512
diff --git a/source/client/src/clientImpl.c b/source/client/src/clientImpl.c
index 0ee99f77aa..64cbc8a5d0 100644
--- a/source/client/src/clientImpl.c
+++ b/source/client/src/clientImpl.c
@@ -152,6 +152,7 @@ int32_t parseSql(SRequestObj* pRequest, SQueryNode** pQuery) {
     .pMsg = pRequest->msgBuf,
     .msgLen = ERROR_MSG_BUF_DEFAULT_SIZE
   };
+
   int32_t code = qParseQuerySql(&cxt, pQuery);
   tfree(cxt.ctx.db);
   return code;
@@ -420,7 +421,15 @@ void processMsgFromServer(void* parent, SRpcMsg* pMsg, SEpSet* pEpSet) {
     taosReleaseRef(clientReqRefPool, pSendInfo->requestObjRefId);
   }
 
-  SDataBuf buf = {.pData = pMsg->pCont, .len = pMsg->contLen};
+  SDataBuf buf = {.len = pMsg->contLen};
+  buf.pData = calloc(1, pMsg->contLen);
+  if (buf.pData == NULL) {
+    terrno     = TSDB_CODE_OUT_OF_MEMORY;
+    pMsg->code = TSDB_CODE_OUT_OF_MEMORY;
+  } else {
+    memcpy(buf.pData, pMsg->pCont, pMsg->contLen);
+  }
+
   pSendInfo->fp(pSendInfo->param, &buf, pMsg->code);
   rpcFreeCont(pMsg->pCont);
 }
diff --git a/source/client/src/clientMsgHandler.c b/source/client/src/clientMsgHandler.c
index bdf54eb21c..b46304e622 100644
--- a/source/client/src/clientMsgHandler.c
+++ b/source/client/src/clientMsgHandler.c
@@ -99,10 +99,10 @@ SMsgSendInfo* buildSendMsgInfoImpl(SRequestObj *pRequest) {
   } else {
     assert(pRequest != NULL);
     pMsgSendInfo->requestObjRefId = pRequest->self;
-    pMsgSendInfo->msgInfo = pRequest->body.requestMsg;
-    pMsgSendInfo->msgType = pRequest->type;
+    pMsgSendInfo->msgInfo   = pRequest->body.requestMsg;
+    pMsgSendInfo->msgType   = pRequest->type;
     pMsgSendInfo->requestId = pRequest->requestId;
-    pMsgSendInfo->param = pRequest;
+    pMsgSendInfo->param     = pRequest;
 
     pMsgSendInfo->fp = (handleRequestRspFp[pRequest->type] == NULL)? genericRspCallback:handleRequestRspFp[pRequest->type];
   }
@@ -165,8 +165,11 @@ int32_t processRetrieveMnodeRsp(void* param, const SDataBuf* pMsg, int32_t code)
   pRetrieve->precision  = htons(pRetrieve->precision);
 
   SReqResultInfo* pResInfo = &pRequest->body.resInfo;
+
+  tfree(pResInfo->pRspMsg);
+  pResInfo->pRspMsg   = pMsg->pData;
   pResInfo->numOfRows = pRetrieve->numOfRows;
-  pResInfo->pData = pRetrieve->data;              // todo fix this in async model
+  pResInfo->pData     = pRetrieve->data;              // todo fix this in async model
 
   pResInfo->current = 0;
   setResultDataPtr(pResInfo, pResInfo->fields, pResInfo->numOfCols, pResInfo->numOfRows);
diff --git a/source/client/test/clientTests.cpp b/source/client/test/clientTests.cpp
index d14719fffb..2a3b38b828 100644
--- a/source/client/test/clientTests.cpp
+++ b/source/client/test/clientTests.cpp
@@ -50,13 +50,13 @@ int main(int argc, char** argv) {
 TEST(testCase, driverInit_Test) { taos_init(); }
 
 TEST(testCase, connect_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
   taos_close(pConn);
 }
 
 TEST(testCase, create_user_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "create user abc pass 'abc'");
@@ -69,7 +69,7 @@ TEST(testCase, create_user_Test) {
 }
 
 TEST(testCase, create_account_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "create account aabc pass 'abc'");
@@ -82,7 +82,7 @@ TEST(testCase, create_account_Test) {
 }
 
 TEST(testCase, drop_account_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "drop account aabc");
@@ -95,7 +95,7 @@ TEST(testCase, drop_account_Test) {
 }
 
 TEST(testCase, show_user_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "show users");
@@ -114,7 +114,7 @@ TEST(testCase, show_user_Test) {
 }
 
 TEST(testCase, drop_user_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "drop user abc");
@@ -127,7 +127,7 @@ TEST(testCase, drop_user_Test) {
 }
 
 TEST(testCase, show_db_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
 //  assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "show databases");
@@ -146,7 +146,7 @@ TEST(testCase, show_db_Test) {
 }
 
 TEST(testCase, create_db_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "create database abc1");
@@ -169,8 +169,46 @@ TEST(testCase, create_db_Test) {
   taos_close(pConn);
 }
 
+TEST(testCase, create_dnode_Test) {
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  assert(pConn != NULL);
+
+  TAOS_RES* pRes = taos_query(pConn, "create dnode abc1");
+  if (taos_errno(pRes) != 0) {
+    printf("error in create dnode, reason:%s\n", taos_errstr(pRes));
+  }
+
+  TAOS_FIELD* pFields = taos_fetch_fields(pRes);
+  ASSERT_TRUE(pFields == NULL);
+
+  int32_t numOfFields = taos_num_fields(pRes);
+  ASSERT_EQ(numOfFields, 0);
+
+  taos_free_result(pRes);
+  taos_close(pConn);
+}
+
+TEST(testCase, drop_dnode_Test) {
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
+  assert(pConn != NULL);
+
+  TAOS_RES* pRes = taos_query(pConn, "drop dnode 2");
+  if (taos_errno(pRes) != 0) {
+    printf("error in drop dnode, reason:%s\n", taos_errstr(pRes));
+  }
+
+  TAOS_FIELD* pFields = taos_fetch_fields(pRes);
+  ASSERT_TRUE(pFields == NULL);
+
+  int32_t numOfFields = taos_num_fields(pRes);
+  ASSERT_EQ(numOfFields, 0);
+
+  taos_free_result(pRes);
+  taos_close(pConn);
+}
+
 TEST(testCase, use_db_test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "use abc1");
@@ -188,7 +226,7 @@ TEST(testCase, use_db_test) {
 }
 
 TEST(testCase, drop_db_test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   showDB(pConn);
@@ -210,7 +248,7 @@ TEST(testCase, drop_db_test) {
 }
 
  TEST(testCase, create_stable_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "create database abc1");
@@ -241,7 +279,7 @@ TEST(testCase, drop_db_test) {
 }
 
 TEST(testCase, create_table_Test) {
-  //  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  //  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   //  assert(pConn != NULL);
   //
   //  TAOS_RES* pRes = taos_query(pConn, "use abc1");
@@ -256,7 +294,7 @@ TEST(testCase, create_table_Test) {
 TEST(testCase, create_ctable_Test) {}
 
 TEST(testCase, show_stable_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "use abc1");
@@ -273,7 +311,6 @@ TEST(testCase, show_stable_Test) {
   }
 
   TAOS_ROW pRow = NULL;
-
   TAOS_FIELD* pFields = taos_fetch_fields(pRes);
   int32_t numOfFields = taos_num_fields(pRes);
 
@@ -284,12 +321,11 @@ TEST(testCase, show_stable_Test) {
   }
 
   taos_free_result(pRes);
-
   taos_close(pConn);
 }
 
 TEST(testCase, show_vgroup_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "use abc1");
@@ -322,7 +358,7 @@ TEST(testCase, show_vgroup_Test) {
 }
 
 TEST(testCase, drop_stable_Test) {
-  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
   assert(pConn != NULL);
 
   TAOS_RES* pRes = taos_query(pConn, "create database abc1");
@@ -347,7 +383,7 @@ TEST(testCase, drop_stable_Test) {
 }
 
 //TEST(testCase, show_table_Test) {
-//  TAOS* pConn = taos_connect("ubuntu", "root", "taosdata", NULL, 0);
+//  TAOS* pConn = taos_connect("localhost", "root", "taosdata", NULL, 0);
 //  assert(pConn != NULL);
 //
 //  TAOS_RES* pRes = taos_query(pConn, "use abc1");
diff --git a/source/libs/parser/inc/astToMsg.h b/source/libs/parser/inc/astToMsg.h
index 848bbc346e..5358a523fa 100644
--- a/source/libs/parser/inc/astToMsg.h
+++ b/source/libs/parser/inc/astToMsg.h
@@ -12,6 +12,8 @@ SDropUserMsg* buildDropUserMsg(SSqlInfo* pInfo, int32_t* outputLen, int64_t id,
 SShowMsg* buildShowMsg(SShowInfo* pShowInfo, SParseBasicCtx* pParseCtx, char* msgBuf, int32_t msgLen);
 SCreateDbMsg* buildCreateDbMsg(SCreateDbInfo* pCreateDbInfo, SParseBasicCtx *pCtx, SMsgBuf* pMsgBuf);
 SCreateStbMsg* buildCreateTableMsg(SCreateTableSql* pCreateTableSql, int32_t* len, SParseBasicCtx* pParseCtx, SMsgBuf* pMsgBuf);
-SDropTableMsg* buildDropTableMsg(SSqlInfo* pInfo, int32_t* len, SParseBasicCtx* pParseCtx, SMsgBuf* pMsgBuf);
+SDropStbMsg* buildDropStableMsg(SSqlInfo* pInfo, int32_t* len, SParseBasicCtx* pParseCtx, SMsgBuf* pMsgBuf);
+SCreateDnodeMsg *buildCreateDnodeMsg(SSqlInfo* pInfo, int32_t* len, SMsgBuf* pMsgBuf);
+SDropDnodeMsg *buildDropDnodeMsg(SSqlInfo* pInfo, int32_t* len, SMsgBuf* pMsgBuf);
 
 #endif  // TDENGINE_ASTTOMSG_H
diff --git a/source/libs/parser/src/astToMsg.c b/source/libs/parser/src/astToMsg.c
index 6b92357748..025ec7fb0a 100644
--- a/source/libs/parser/src/astToMsg.c
+++ b/source/libs/parser/src/astToMsg.c
@@ -356,7 +356,7 @@ SCreateStbMsg* buildCreateTableMsg(SCreateTableSql* pCreateTableSql, int32_t* le
   return pCreateTableMsg;
 }
 
-SDropTableMsg* buildDropTableMsg(SSqlInfo* pInfo, int32_t* len, SParseBasicCtx* pParseCtx, SMsgBuf* pMsgBuf) {
+SDropStbMsg* buildDropStableMsg(SSqlInfo* pInfo, int32_t* len, SParseBasicCtx* pParseCtx, SMsgBuf* pMsgBuf) {
   SToken* tableName = taosArrayGet(pInfo->pMiscInfo->a, 0);
 
   SName name = {0};
@@ -366,13 +366,53 @@ SDropTableMsg* buildDropTableMsg(SSqlInfo* pInfo, int32_t* len, SParseBasicCtx*
     return NULL;
   }
 
-  SDropTableMsg *pDropTableMsg = (SDropTableMsg*) calloc(1, sizeof(SDropTableMsg));
+  SDropStbMsg *pDropTableMsg = (SDropStbMsg*) calloc(1, sizeof(SDropStbMsg));
 
   code = tNameExtractFullName(&name, pDropTableMsg->name);
   assert(code == TSDB_CODE_SUCCESS && name.type == TSDB_TABLE_NAME_T);
 
-  pDropTableMsg->ignoreNotExists = pInfo->pMiscInfo->existsCheck ? 1 : 0;
+  pDropTableMsg->igNotExists = pInfo->pMiscInfo->existsCheck ? 1 : 0;
   *len = sizeof(SDropTableMsg);
   return pDropTableMsg;
 }
 
+SCreateDnodeMsg *buildCreateDnodeMsg(SSqlInfo* pInfo, int32_t* len, SMsgBuf* pMsgBuf) {
+  const char* msg1 = "invalid host name (name too long, maximum length 128)";
+  const char* msg2 = "dnode name can not be string";
+
+  if (taosArrayGetSize(pInfo->pMiscInfo->a) > 1) {
+    buildInvalidOperationMsg(pMsgBuf, msg1);
+    return NULL;
+  }
+
+  SToken* id = taosArrayGet(pInfo->pMiscInfo->a, 0);
+  if (id->type != TK_ID) {
+    buildInvalidOperationMsg(pMsgBuf, msg2);
+    return NULL;
+  }
+
+  SCreateDnodeMsg *pCreate = (SCreateDnodeMsg *) calloc(1, sizeof(SCreateDnodeMsg));
+  strncpy(pCreate->ep, id->z, id->n);
+  *len = sizeof(SCreateDnodeMsg);
+
+  return pCreate;
+}
+
+SDropDnodeMsg *buildDropDnodeMsg(SSqlInfo* pInfo, int32_t* len, SMsgBuf* pMsgBuf) {
+  SToken* pzName = taosArrayGet(pInfo->pMiscInfo->a, 0);
+
+
+  char* end = NULL;
+  SDropDnodeMsg * pDrop = (SDropDnodeMsg *)calloc(1, sizeof(SDropDnodeMsg));
+  pDrop->dnodeId = strtoll(pzName->z, &end, 10);
+  *len = sizeof(SDropDnodeMsg);
+
+  if (end - pzName->z != pzName->n) {
+    buildInvalidOperationMsg(pMsgBuf, "invalid dnode id");
+    tfree(pDrop);
+    return NULL;
+  }
+
+  return pDrop;
+}
+
diff --git a/source/libs/parser/src/dCDAstProcess.c b/source/libs/parser/src/dCDAstProcess.c
index ddbd6eb58c..bdddbec327 100644
--- a/source/libs/parser/src/dCDAstProcess.c
+++ b/source/libs/parser/src/dCDAstProcess.c
@@ -710,13 +710,32 @@ int32_t qParserValidateDclSqlNode(SSqlInfo* pInfo, SParseBasicCtx* pCtx, SDclStm
     }
 
     case TSDB_SQL_DROP_TABLE: {
-      pDcl->pMsg = (char*)buildDropTableMsg(pInfo, &pDcl->msgLen, pCtx, pMsgBuf);
+      pDcl->pMsg = (char*)buildDropStableMsg(pInfo, &pDcl->msgLen, pCtx, pMsgBuf);
       if (pDcl->pMsg == NULL) {
-        return terrno;
+        code = terrno;
       }
 
       pDcl->msgType = TDMT_MND_DROP_STB;
-      return TSDB_CODE_SUCCESS;
+      break;
+    }
+
+    case TSDB_SQL_CREATE_DNODE: {
+      pDcl->pMsg = (char*) buildCreateDnodeMsg(pInfo, &pDcl->msgLen, pMsgBuf);
+      if (pDcl->pMsg == NULL) {
+        code = terrno;
+      }
+
+      pDcl->msgType = TDMT_MND_CREATE_DNODE;
+      break;
+    }
+
+    case TSDB_SQL_DROP_DNODE: {
+      pDcl->pMsg = (char*) buildDropDnodeMsg(pInfo, &pDcl->msgLen, pMsgBuf);
+      if (pDcl->pMsg == NULL) {
+        code = terrno;
+      }
+
+      pDcl->msgType = TDMT_MND_DROP_DNODE;
       break;
     }
 
diff --git a/source/libs/parser/src/parser.c b/source/libs/parser/src/parser.c
index 0f77135ec1..5c9a48e52f 100644
--- a/source/libs/parser/src/parser.c
+++ b/source/libs/parser/src/parser.c
@@ -44,11 +44,12 @@ int32_t parseQuerySql(SParseContext* pCxt, SQueryNode** pQuery) {
   }
 
   if (!isDqlSqlStatement(&info)) {
-    SDclStmtInfo* pDcl = calloc(1, sizeof(SQueryStmtInfo));
+    SDclStmtInfo* pDcl = calloc(1, sizeof(SDclStmtInfo));
     if (NULL == pDcl) {
       terrno = TSDB_CODE_TSC_OUT_OF_MEMORY; // set correct error code.
       return terrno;
     }
+
     pDcl->nodeType = info.type;
     int32_t code = qParserValidateDclSqlNode(&info, &pCxt->ctx, pDcl, pCxt->pMsg, pCxt->msgLen);
     if (code == TSDB_CODE_SUCCESS) {