enh: refactor show variables

include/common/tmsg.h

@@ -510,7 +510,8 @@ typedef struct {
   int8_t   superUser;
   int8_t   connType;
   SEpSet   epSet;
-  char     sVersion[128];
+  char     sVer[TSDB_VERSION_LEN];
+  char     sDetailVer[128];
 } SConnectRsp;
 
 int32_t tSerializeSConnectRsp(void* buf, int32_t bufLen, SConnectRsp* pRsp);
@@ -836,6 +837,20 @@ typedef struct {
 int32_t tSerializeSDnodeListReq(void* buf, int32_t bufLen, SDnodeListReq* pReq);
 int32_t tDeserializeSDnodeListReq(void* buf, int32_t bufLen, SDnodeListReq* pReq);
 
+typedef struct {
+  int32_t useless;  // useless
+} SServerVerReq;
+
+int32_t tSerializeSServerVerReq(void* buf, int32_t bufLen, SServerVerReq* pReq);
+int32_t tDeserializeSServerVerReq(void* buf, int32_t bufLen, SServerVerReq* pReq);
+
+typedef struct {
+  char ver[TSDB_VERSION_LEN];
+} SServerVerRsp;
+
+int32_t tSerializeSServerVerRsp(void* buf, int32_t bufLen, SServerVerRsp* pRsp);
+int32_t tDeserializeSServerVerRsp(void* buf, int32_t bufLen, SServerVerRsp* pRsp);
+
 
 typedef struct SQueryNodeAddr {
   int32_t nodeId;  // vgId or qnodeId
@@ -1229,6 +1244,21 @@ typedef struct {
 int32_t tSerializeSShowVariablesReq(void* buf, int32_t bufLen, SShowVariablesReq* pReq);
 int32_t tDeserializeSShowVariablesReq(void* buf, int32_t bufLen, SShowVariablesReq* pReq);
 
+typedef struct {
+  char  name[TSDB_CONFIG_OPTION_LEN + 1];
+  char  value[TSDB_CONFIG_VALUE_LEN + 1];
+} SVariablesInfo;
+
+typedef struct {
+  SArray *variables;  //SArray<SVariablesInfo>
+} SShowVariablesRsp;
+
+int32_t tSerializeSShowVariablesRsp(void* buf, int32_t bufLen, SShowVariablesRsp* pReq);
+int32_t tDeserializeSShowVariablesRsp(void* buf, int32_t bufLen, SShowVariablesRsp* pReq);
+
+void tFreeSShowVariablesRsp(SShowVariablesRsp* pRsp);
+
+
 /*
  * sql: show tables like '%a_%'
  * payload is the query condition, e.g., '%a_%'

include/common/tmsgdef.h

@@ -163,6 +163,7 @@ enum {
   TD_DEF_MSG_TYPE(TDMT_MND_REDISTRIBUTE_VGROUP, "redistribute-vgroup", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_MND_SPLIT_VGROUP, "split-vgroup", NULL, NULL)
   TD_DEF_MSG_TYPE(TDMT_MND_SHOW_VARIABLES, "show-variables", NULL, NULL)
+  TD_DEF_MSG_TYPE(TDMT_MND_SERVER_VERSION, "server-version", NULL, NULL)
 
   TD_NEW_MSG_SEG(TDMT_VND_MSG)
   TD_DEF_MSG_TYPE(TDMT_VND_SUBMIT, "submit", SSubmitReq, SSubmitRsp)

include/libs/catalog/catalog.h

@@ -71,6 +71,7 @@ typedef struct SCatalogReq {
   SArray* pTableCfg;      // element is SNAME
   bool    qNodeRequired;  // valid qnode
   bool    dNodeRequired;  // valid dnode
+  bool    svrVerRequired;
   bool    forceUpdate;
 } SCatalogReq;
 
@@ -92,6 +93,7 @@ typedef struct SMetaData {
   SArray*   pQnodeList;   // pRes = SArray<SQueryNodeLoad>*
   SArray*   pTableCfg;    // pRes = STableCfg*
   SArray*   pDnodeList;   // pRes = SArray<SEpSet>*
+  SMetaRes* pSvrVer;      // pRes = char*
 } SMetaData;
 
 typedef struct SCatalogCfg {
@@ -268,7 +270,7 @@ int32_t catalogGetTableHashVgroup(SCatalog* pCatalog, SRequestConnInfo* pConn, c
  */
 int32_t catalogGetAllMeta(SCatalog* pCatalog, SRequestConnInfo* pConn, const SCatalogReq* pReq, SMetaData* pRsp);
 
-int32_t catalogAsyncGetAllMeta(SCatalog* pCtg, SRequestConnInfo* pConn, uint64_t reqId, const SCatalogReq* pReq, catalogCallback fp, void* param, int64_t* jobId);
+int32_t catalogAsyncGetAllMeta(SCatalog* pCtg, SRequestConnInfo* pConn, const SCatalogReq* pReq, catalogCallback fp, void* param, int64_t* jobId);
 
 int32_t catalogGetQnodeList(SCatalog* pCatalog, SRequestConnInfo* pConn, SArray* pQnodeList);
 
@@ -298,6 +300,8 @@ int32_t catalogUpdateUserAuthInfo(SCatalog* pCtg, SGetUserAuthRsp* pAuth);
 
 int32_t catalogUpdateVgEpSet(SCatalog* pCtg, const char* dbFName, int32_t vgId, SEpSet *epSet);
 
+int32_t catalogGetServerVersion(SCatalog* pCtg, SRequestConnInfo *pConn, char** pVersion);
+
 int32_t ctgdLaunchAsyncCall(SCatalog* pCtg, SRequestConnInfo* pConn, uint64_t reqId, bool forceUpdate);
 
 int32_t catalogClearCache(void);

include/libs/nodes/cmdnodes.h

@@ -40,7 +40,6 @@ extern "C" {
 #define SHOW_LOCAL_VARIABLES_RESULT_FIELD1_LEN (TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE)
 #define SHOW_LOCAL_VARIABLES_RESULT_FIELD2_LEN (TSDB_CONFIG_VALUE_LEN + VARSTR_HEADER_SIZE)
 
-
 #define PRIVILEGE_TYPE_MASK(n) (1 << n)
 
 #define PRIVILEGE_TYPE_ALL   PRIVILEGE_TYPE_MASK(0)

include/libs/parser/parser.h

@@ -51,6 +51,8 @@ typedef struct SParseContext {
   bool             isSuperUser;
   bool             async;
   int8_t           schemalessType;
+  const char*      svrVer;
+  bool             nodeOffline;
 } SParseContext;
 
 int32_t qParseSql(SParseContext* pCxt, SQuery** pQuery);

source/client/inc/clientInt.h

@@ -54,6 +54,11 @@ enum {
   RES_TYPE__TMQ_META,
 };
 
+#define SHOW_VARIABLES_RESULT_COLS      2
+#define SHOW_VARIABLES_RESULT_FIELD1_LEN (TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE)
+#define SHOW_VARIABLES_RESULT_FIELD2_LEN (TSDB_CONFIG_VALUE_LEN + VARSTR_HEADER_SIZE)
+
+
 #define TD_RES_QUERY(res)    (*(int8_t*)res == RES_TYPE__QUERY)
 #define TD_RES_TMQ(res)      (*(int8_t*)res == RES_TYPE__TMQ)
 #define TD_RES_TMQ_META(res) (*(int8_t*)res == RES_TYPE__TMQ_META)
@@ -104,6 +109,8 @@ typedef struct SHeartBeatInfo {
 struct SAppInstInfo {
   int64_t            numOfConns;
   SCorEpSet          mgmtEp;
+  int32_t            totalDnodes;
+  int32_t            onlineDnodes;
   TdThreadMutex      qnodeMutex;
   SArray*            pQnodeList;
   SAppClusterSummary summary;
@@ -127,7 +134,8 @@ typedef struct STscObj {
   char          user[TSDB_USER_LEN];
   char          pass[TSDB_PASSWORD_LEN];
   char          db[TSDB_DB_FNAME_LEN];
-  char          ver[128];
+  char          sVer[TSDB_VERSION_LEN];
+  char          sDetailVer[128];
   int8_t        connType;
   int32_t       acctId;
   uint32_t      connId;

source/client/src/clientHb.c

@@ -161,6 +161,9 @@ static int32_t hbQueryHbRspHandle(SAppHbMgr *pAppHbMgr, SClientHbRsp *pRsp) {
             
         updateEpSet_s(&pTscObj->pAppInfo->mgmtEp, &pRsp->query->epSet);
       }
+      
+      pTscObj->pAppInfo->totalDnodes = pRsp->query->totalDnodes;
+      pTscObj->pAppInfo->onlineDnodes = pRsp->query->onlineDnodes;
       pTscObj->connId = pRsp->query->connId;
 
       if (pRsp->query->killRid) {

source/client/src/clientImpl.c

@@ -178,7 +178,9 @@ int32_t parseSql(SRequestObj* pRequest, bool topicQuery, SQuery** pQuery, SStmtC
                        .pStmtCb = pStmtCb,
                        .pUser = pTscObj->user,
                        .schemalessType = pTscObj->schemalessType,
-                       .isSuperUser = (0 == strcmp(pTscObj->user, TSDB_DEFAULT_USER))};
+                       .isSuperUser = (0 == strcmp(pTscObj->user, TSDB_DEFAULT_USER)),
+                       .svrVer = pTscObj->sVer,
+                       .nodeOffline = (pTscObj->pAppInfo->onlineDnodes < pTscObj->pAppInfo->totalDnodes)};
 
   cxt.mgmtEpSet = getEpSet_s(&pTscObj->pAppInfo->mgmtEp);
   int32_t code = catalogGetHandle(pTscObj->pAppInfo->clusterId, &cxt.pCatalog);

source/client/src/clientMain.c

@@ -623,7 +623,7 @@ const char *taos_get_server_info(TAOS *taos) {
 
   releaseTscObj(*(int64_t *)taos);
 
-  return pTscObj->ver;
+  return pTscObj->sDetailVer;
 }
 
 typedef struct SqlParseWrapper {
@@ -766,7 +766,7 @@ void doAsyncQuery(SRequestObj *pRequest, bool updateMetaForce) {
                            .requestObjRefId = pCxt->requestRid,
                            .mgmtEps = pCxt->mgmtEpSet};
 
-  code = catalogAsyncGetAllMeta(pCxt->pCatalog, &conn, pRequest->requestId, &catalogReq, retrieveMetaCallback, pWrapper,
+  code = catalogAsyncGetAllMeta(pCxt->pCatalog, &conn, &catalogReq, retrieveMetaCallback, pWrapper,
                                 &pRequest->body.queryJob);
   if (code == TSDB_CODE_SUCCESS) {
     return;
@@ -934,7 +934,7 @@ int taos_load_table_info(TAOS *taos, const char *tableNameList) {
 
   conn.mgmtEps = getEpSet_s(&pTscObj->pAppInfo->mgmtEp);
 
-  code = catalogAsyncGetAllMeta(pCtg, &conn, pRequest->requestId, &catalogReq, syncCatalogFn, &param, NULL);
+  code = catalogAsyncGetAllMeta(pCtg, &conn, &catalogReq, syncCatalogFn, &param, NULL);
   if (code) {
     goto _return;
   }

source/client/src/clientMsgHandler.c

@@ -82,7 +82,8 @@ int32_t processConnectRsp(void* param, const SDataBuf* pMsg, int32_t code) {
 
   pTscObj->connId = connectRsp.connId;
   pTscObj->acctId = connectRsp.acctId;
-  tstrncpy(pTscObj->ver, connectRsp.sVersion, tListLen(pTscObj->ver));
+  tstrncpy(pTscObj->sVer, connectRsp.sVer, tListLen(pTscObj->sVer));
+  tstrncpy(pTscObj->sDetailVer, connectRsp.sDetailVer, tListLen(pTscObj->sDetailVer));
 
   // update the appInstInfo
   pTscObj->pAppInfo->clusterId = connectRsp.clusterId;
@@ -287,6 +288,103 @@ int32_t processAlterStbRsp(void* param, const SDataBuf* pMsg, int32_t code) {
   return code;
 }
 
+static int32_t buildShowVariablesBlock(SArray* pVars, SSDataBlock** block) {
+  SSDataBlock* pBlock = taosMemoryCalloc(1, sizeof(SSDataBlock));
+  pBlock->info.hasVarCol = true;
+
+  pBlock->pDataBlock = taosArrayInit(SHOW_VARIABLES_RESULT_COLS, sizeof(SColumnInfoData));
+
+  SColumnInfoData infoData = {0};
+  infoData.info.type = TSDB_DATA_TYPE_VARCHAR;
+  infoData.info.bytes = SHOW_VARIABLES_RESULT_FIELD1_LEN;
+
+  taosArrayPush(pBlock->pDataBlock, &infoData);
+
+  infoData.info.type = TSDB_DATA_TYPE_VARCHAR;
+  infoData.info.bytes = SHOW_VARIABLES_RESULT_FIELD2_LEN;
+  taosArrayPush(pBlock->pDataBlock, &infoData);
+
+  int32_t numOfCfg = taosArrayGetSize(pVars);
+  blockDataEnsureCapacity(pBlock, numOfCfg);
+
+  for (int32_t i = 0, c = 0; i < numOfCfg; ++i, c = 0) {
+    SVariablesInfo *pInfo = taosArrayGet(pVars, i);
+
+    char name[TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE] = {0};
+    STR_WITH_MAXSIZE_TO_VARSTR(name, pInfo->name, TSDB_CONFIG_OPTION_LEN + VARSTR_HEADER_SIZE);
+    SColumnInfoData *pColInfo = taosArrayGet(pBlock->pDataBlock, c++);
+    colDataAppend(pColInfo, i, name, false);
+    
+    char value[TSDB_CONFIG_VALUE_LEN + VARSTR_HEADER_SIZE] = {0};
+    STR_WITH_MAXSIZE_TO_VARSTR(value, pInfo->value, TSDB_CONFIG_VALUE_LEN + VARSTR_HEADER_SIZE);
+    pColInfo = taosArrayGet(pBlock->pDataBlock, c++);
+    colDataAppend(pColInfo, i, value, false);
+  }
+
+  pBlock->info.rows = numOfCfg;
+
+  *block = pBlock;
+  
+  return TSDB_CODE_SUCCESS;
+}
+
+
+static int32_t buildShowVariablesRsp(SArray* pVars, SRetrieveTableRsp** pRsp) {
+  SSDataBlock* pBlock = NULL;
+  int32_t code = buildShowVariablesBlock(pVars, &pBlock);
+  if (code) {
+    return code;
+  }
+
+  size_t rspSize = sizeof(SRetrieveTableRsp) + blockGetEncodeSize(pBlock);
+  *pRsp = taosMemoryCalloc(1, rspSize);
+  if (NULL == *pRsp) {
+    return TSDB_CODE_OUT_OF_MEMORY;
+  }
+
+  (*pRsp)->useconds = 0;
+  (*pRsp)->completed = 1;
+  (*pRsp)->precision = 0;
+  (*pRsp)->compressed = 0;
+  (*pRsp)->compLen = 0;
+  (*pRsp)->numOfRows = htonl(pBlock->info.rows);
+  (*pRsp)->numOfCols = htonl(SHOW_VARIABLES_RESULT_COLS);
+
+  int32_t len = 0;
+  blockCompressEncode(pBlock, (*pRsp)->data, &len, SHOW_VARIABLES_RESULT_COLS, false);
+  ASSERT(len == rspSize - sizeof(SRetrieveTableRsp));
+
+  blockDataDestroy(pBlock);
+  return TSDB_CODE_SUCCESS;
+}
+
+int32_t processShowVariablesRsp(void* param, const SDataBuf* pMsg, int32_t code) {
+  SRequestObj* pRequest = param;
+  if (code != TSDB_CODE_SUCCESS) {
+    setErrno(pRequest, code);
+  } else {
+    SShowVariablesRsp rsp = {0};
+    SRetrieveTableRsp* pRes = NULL;
+    code = tDeserializeSShowVariablesRsp(pMsg->pData, pMsg->len, &rsp);
+    if (TSDB_CODE_SUCCESS == code) {
+      code = buildShowVariablesRsp(rsp.variables, &pRes);
+    }
+    if (TSDB_CODE_SUCCESS == code) {
+      code = setQueryResultFromRsp(&pRequest->body.resInfo, pRes, false, false);
+    }
+    
+    tFreeSShowVariablesRsp(&rsp);
+  }
+
+  if (pRequest->body.queryFp != NULL) {
+    pRequest->body.queryFp(pRequest->body.param, pRequest, code);
+  } else {
+    tsem_post(&pRequest->body.rspSem);
+  }
+  return code;
+}
+
+
 __async_send_cb_fn_t getMsgRspHandle(int32_t msgType) {
   switch (msgType) {
     case TDMT_MND_CONNECT:
@@ -301,6 +399,8 @@ __async_send_cb_fn_t getMsgRspHandle(int32_t msgType) {
       return processDropDbRsp;
     case TDMT_MND_ALTER_STB:
       return processAlterStbRsp;
+    case TDMT_MND_SHOW_VARIABLES:
+      return processShowVariablesRsp;
     default:
       return genericRspCallback;
   }

source/common/src/tmsg.c

@@ -2246,6 +2246,56 @@ int32_t tDeserializeSDnodeListReq(void *buf, int32_t bufLen, SDnodeListReq *pReq
   return 0;
 }
 
+int32_t tSerializeSServerVerReq(void *buf, int32_t bufLen, SServerVerReq *pReq) {
+  SEncoder encoder = {0};
+  tEncoderInit(&encoder, buf, bufLen);
+
+  if (tStartEncode(&encoder) < 0) return -1;
+  if (tEncodeI32(&encoder, pReq->useless) < 0) return -1;
+  tEndEncode(&encoder);
+
+  int32_t tlen = encoder.pos;
+  tEncoderClear(&encoder);
+  return tlen;
+}
+
+int32_t tDeserializeSServerVerReq(void *buf, int32_t bufLen, SServerVerReq *pReq) {
+  SDecoder decoder = {0};
+  tDecoderInit(&decoder, buf, bufLen);
+
+  if (tStartDecode(&decoder) < 0) return -1;
+  if (tDecodeI32(&decoder, &pReq->useless) < 0) return -1;
+
+  tEndDecode(&decoder);
+  tDecoderClear(&decoder);
+  return 0;
+}
+
+int32_t tSerializeSServerVerRsp(void *buf, int32_t bufLen, SServerVerRsp *pRsp) {
+  SEncoder encoder = {0};
+  tEncoderInit(&encoder, buf, bufLen);
+
+  if (tStartEncode(&encoder) < 0) return -1;
+  if (tEncodeCStr(&encoder, pRsp->ver) < 0) return -1;
+  tEndEncode(&encoder);
+
+  int32_t tlen = encoder.pos;
+  tEncoderClear(&encoder);
+  return tlen;
+}
+
+int32_t tDeserializeSServerVerRsp(void *buf, int32_t bufLen, SServerVerRsp *pRsp) {
+  SDecoder decoder = {0};
+  tDecoderInit(&decoder, buf, bufLen);
+
+  if (tStartDecode(&decoder) < 0) return -1;
+  if (tDecodeCStrTo(&decoder, pRsp->ver) < 0) return -1;
+
+  tEndDecode(&decoder);
+  tDecoderClear(&decoder);
+  return 0;
+}
+
 
 int32_t tSerializeSQnodeListRsp(void *buf, int32_t bufLen, SQnodeListRsp *pRsp) {
   SEncoder encoder = {0};
@@ -2855,6 +2905,67 @@ int32_t tDeserializeSShowVariablesReq(void *buf, int32_t bufLen, SShowVariablesR
   return 0;
 }
 
+int32_t tEncodeSVariablesInfo(SEncoder* pEncoder, SVariablesInfo* pInfo) {
+  if (tEncodeCStr(pEncoder, pInfo->name) < 0) return -1;
+  if (tEncodeCStr(pEncoder, pInfo->value) < 0) return -1;
+  return 0;
+}
+
+int32_t tDecodeSVariablesInfo(SDecoder* pDecoder, SVariablesInfo* pInfo) {
+  if (tDecodeCStrTo(pDecoder, pInfo->name) < 0) return -1;
+  if (tDecodeCStrTo(pDecoder, pInfo->value) < 0) return -1;
+  return 0;
+}
+
+
+int32_t tSerializeSShowVariablesRsp(void* buf, int32_t bufLen, SShowVariablesRsp* pRsp) {
+  SEncoder encoder = {0};
+  tEncoderInit(&encoder, buf, bufLen);
+
+  if (tStartEncode(&encoder) < 0) return -1;
+  int32_t varNum = taosArrayGetSize(pRsp->variables);
+  if (tEncodeI32(&encoder, varNum) < 0) return -1;
+  for (int32_t i = 0; i < varNum; ++i) {
+    SVariablesInfo* pInfo = taosArrayGet(pRsp->variables, i);
+    if (tEncodeSVariablesInfo(&encoder, pInfo) < 0) return -1;
+  }
+  tEndEncode(&encoder);
+
+  int32_t tlen = encoder.pos;
+  tEncoderClear(&encoder);
+  return tlen;
+}
+
+int32_t tDeserializeSShowVariablesRsp(void* buf, int32_t bufLen, SShowVariablesRsp* pRsp) {
+  SDecoder decoder = {0};
+  tDecoderInit(&decoder, buf, bufLen);
+
+  if (tStartDecode(&decoder) < 0) return -1;
+  int32_t varNum = 0;
+  if (tDecodeI32(&decoder, &varNum) < 0) return -1;
+  if (varNum > 0) {
+    pRsp->variables = taosArrayInit(varNum, sizeof(SVariablesInfo));
+    if (NULL == pRsp->variables) return -1;
+    for (int32_t i = 0; i < varNum; ++i) {
+      SVariablesInfo info = {0};
+      if (tDecodeSVariablesInfo(&decoder, &info) < 0) return -1;
+      if (NULL == taosArrayPush(pRsp->variables, &info)) return -1;
+    }
+  }
+
+  tEndDecode(&decoder);
+  tDecoderClear(&decoder);
+  return 0;
+}
+
+void tFreeSShowVariablesRsp(SShowVariablesRsp* pRsp) {
+  if (NULL == pRsp) {
+    return;
+  }
+  
+  taosArrayDestroy(pRsp->variables);
+}
+
 int32_t tSerializeSShowReq(void *buf, int32_t bufLen, SShowReq *pReq) {
   SEncoder encoder = {0};
   tEncoderInit(&encoder, buf, bufLen);
@@ -3396,7 +3507,8 @@ int32_t tSerializeSConnectRsp(void *buf, int32_t bufLen, SConnectRsp *pRsp) {
   if (tEncodeI8(&encoder, pRsp->superUser) < 0) return -1;
   if (tEncodeI8(&encoder, pRsp->connType) < 0) return -1;
   if (tEncodeSEpSet(&encoder, &pRsp->epSet) < 0) return -1;
-  if (tEncodeCStr(&encoder, pRsp->sVersion) < 0) return -1;
+  if (tEncodeCStr(&encoder, pRsp->sVer) < 0) return -1;
+  if (tEncodeCStr(&encoder, pRsp->sDetailVer) < 0) return -1;
   tEndEncode(&encoder);
 
   int32_t tlen = encoder.pos;
@@ -3416,7 +3528,8 @@ int32_t tDeserializeSConnectRsp(void *buf, int32_t bufLen, SConnectRsp *pRsp) {
   if (tDecodeI8(&decoder, &pRsp->superUser) < 0) return -1;
   if (tDecodeI8(&decoder, &pRsp->connType) < 0) return -1;
   if (tDecodeSEpSet(&decoder, &pRsp->epSet) < 0) return -1;
-  if (tDecodeCStrTo(&decoder, pRsp->sVersion) < 0) return -1;
+  if (tDecodeCStrTo(&decoder, pRsp->sVer) < 0) return -1;
+  if (tDecodeCStrTo(&decoder, pRsp->sDetailVer) < 0) return -1;
   tEndDecode(&decoder);
 
   tDecoderClear(&decoder);

source/dnode/mgmt/mgmt_mnode/src/mmHandle.c

@@ -206,6 +206,8 @@ SArray *mmGetMsgHandles() {
   if (dmSetMgmtHandle(pArray, TDMT_MND_SYSTABLE_RETRIEVE, mmPutMsgToReadQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_MND_GRANT, mmPutMsgToWriteQueue, 0) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_MND_AUTH, mmPutMsgToReadQueue, 0) == NULL) goto _OVER;
+  if (dmSetMgmtHandle(pArray, TDMT_MND_SHOW_VARIABLES, mmPutMsgToReadQueue, 0) == NULL) goto _OVER;
+  if (dmSetMgmtHandle(pArray, TDMT_MND_SERVER_VERSION, mmPutMsgToReadQueue, 0) == NULL) goto _OVER;
 
   if (dmSetMgmtHandle(pArray, TDMT_VND_QUERY, mmPutMsgToQueryQueue, 1) == NULL) goto _OVER;
   if (dmSetMgmtHandle(pArray, TDMT_VND_QUERY_CONTINUE, mmPutMsgToQueryQueue, 1) == NULL) goto _OVER;

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

@@ -48,6 +48,7 @@ static int32_t  mndDnodeActionInsert(SSdb *pSdb, SDnodeObj *pDnode);
 static int32_t  mndDnodeActionDelete(SSdb *pSdb, SDnodeObj *pDnode);
 static int32_t  mndDnodeActionUpdate(SSdb *pSdb, SDnodeObj *pOld, SDnodeObj *pNew);
 static int32_t  mndProcessDnodeListReq(SRpcMsg *pReq);
+static int32_t  mndProcessShowVariablesReq(SRpcMsg *pReq);
 
 static int32_t mndProcessCreateDnodeReq(SRpcMsg *pReq);
 static int32_t mndProcessDropDnodeReq(SRpcMsg *pReq);
@@ -78,6 +79,7 @@ int32_t mndInitDnode(SMnode *pMnode) {
   mndSetMsgHandle(pMnode, TDMT_DND_CONFIG_DNODE_RSP, mndProcessConfigDnodeRsp);
   mndSetMsgHandle(pMnode, TDMT_MND_STATUS, mndProcessStatusReq);
   mndSetMsgHandle(pMnode, TDMT_MND_DNODE_LIST, mndProcessDnodeListReq);
+  mndSetMsgHandle(pMnode, TDMT_MND_SHOW_VARIABLES, mndProcessShowVariablesReq);
 
   mndAddShowRetrieveHandle(pMnode, TSDB_MGMT_TABLE_CONFIGS, mndRetrieveConfigs);
   mndAddShowFreeIterHandle(pMnode, TSDB_MGMT_TABLE_CONFIGS, mndCancelGetNextConfig);
@@ -554,6 +556,60 @@ _OVER:
   return code;
 }
 
+static int32_t mndProcessShowVariablesReq(SRpcMsg *pReq) {
+  SShowVariablesRsp rsp = {0};
+  int32_t       code = -1;
+
+  rsp.variables = taosArrayInit(4, sizeof(SVariablesInfo));
+  if (NULL == rsp.variables) {
+    mError("failed to alloc SVariablesInfo array while process show variables req");
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    goto _OVER;
+  }
+
+  SVariablesInfo info = {0};
+
+  strcpy(info.name, "statusInterval");
+  snprintf(info.value, TSDB_CONFIG_VALUE_LEN, "%d", tsStatusInterval);
+  taosArrayPush(rsp.variables, &info);
+
+  strcpy(info.name, "timezone");
+  snprintf(info.value, TSDB_CONFIG_VALUE_LEN, "%s", tsTimezoneStr);
+  taosArrayPush(rsp.variables, &info);
+  
+  strcpy(info.name, "locale");
+  snprintf(info.value, TSDB_CONFIG_VALUE_LEN, "%s", tsLocale);
+  taosArrayPush(rsp.variables, &info);
+
+  strcpy(info.name, "charset");
+  snprintf(info.value, TSDB_CONFIG_VALUE_LEN, "%s", tsCharset);
+  taosArrayPush(rsp.variables, &info);
+
+  int32_t rspLen = tSerializeSShowVariablesRsp(NULL, 0, &rsp);
+  void   *pRsp = rpcMallocCont(rspLen);
+  if (pRsp == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    goto _OVER;
+  }
+
+  tSerializeSShowVariablesRsp(pRsp, rspLen, &rsp);
+
+  pReq->info.rspLen = rspLen;
+  pReq->info.rsp = pRsp;
+  code = 0;
+
+_OVER:
+
+  if (code != 0) {
+    mError("failed to get show variables info since %s", terrstr());
+  }
+
+  tFreeSShowVariablesRsp(&rsp);
+
+  return code;
+}
+
+
 static int32_t mndProcessCreateDnodeReq(SRpcMsg *pReq) {
   SMnode         *pMnode = pReq->info.node;
   int32_t         code = -1;

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

@@ -70,6 +70,7 @@ static void      mndCancelGetNextQuery(SMnode *pMnode, void *pIter);
 static void      mndFreeApp(SAppObj *pApp);
 static int32_t   mndRetrieveApps(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBlock, int32_t rows);
 static void      mndCancelGetNextApp(SMnode *pMnode, void *pIter);
+static int32_t   mndProcessSvrVerReq(SRpcMsg *pReq);
 
 int32_t mndInitProfile(SMnode *pMnode) {
   SProfileMgmt *pMgmt = &pMnode->profileMgmt;
@@ -94,6 +95,7 @@ int32_t mndInitProfile(SMnode *pMnode) {
   mndSetMsgHandle(pMnode, TDMT_MND_CONNECT, mndProcessConnectReq);
   mndSetMsgHandle(pMnode, TDMT_MND_KILL_QUERY, mndProcessKillQueryReq);
   mndSetMsgHandle(pMnode, TDMT_MND_KILL_CONN, mndProcessKillConnReq);
+  mndSetMsgHandle(pMnode, TDMT_MND_SERVER_VERSION, mndProcessSvrVerReq);
 
   mndAddShowRetrieveHandle(pMnode, TSDB_MGMT_TABLE_CONNS, mndRetrieveConns);
   mndAddShowFreeIterHandle(pMnode, TSDB_MGMT_TABLE_CONNS, mndCancelGetNextConn);
@@ -263,7 +265,8 @@ static int32_t mndProcessConnectReq(SRpcMsg *pReq) {
   connectRsp.connType = connReq.connType;
   connectRsp.dnodeNum = mndGetDnodeSize(pMnode);
   
-  snprintf(connectRsp.sVersion, sizeof(connectRsp.sVersion), "ver:%s\nbuild:%s\ngitinfo:%s", version, buildinfo,
+  strcpy(connectRsp.sVer, version);
+  snprintf(connectRsp.sDetailVer, sizeof(connectRsp.sDetailVer), "ver:%s\nbuild:%s\ngitinfo:%s", version, buildinfo,
            gitinfo);
   mndGetMnodeEpSet(pMnode, &connectRsp.epSet);
 
@@ -460,6 +463,27 @@ static int32_t mndUpdateAppInfo(SMnode *pMnode, SClientHbReq *pHbReq, SRpcConnIn
   return TSDB_CODE_SUCCESS;
 }
 
+static int32_t mndGetOnlineDnodeNum(SMnode *pMnode, int32_t *num) {
+  SSdb      *pSdb = pMnode->pSdb;
+  SDnodeObj *pDnode = NULL;
+  int64_t    curMs = taosGetTimestampMs();
+  void      *pIter = NULL;
+  
+  while (true) {
+    pIter = sdbFetch(pSdb, SDB_DNODE, pIter, (void **)&pDnode);
+    if (pIter == NULL) break;
+    
+    bool online = mndIsDnodeOnline(pDnode, curMs);
+    if (online) {
+      (*num)++;
+    }
+    
+    sdbRelease(pSdb, pDnode);
+  }
+
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t mndProcessQueryHeartBeat(SMnode *pMnode, SRpcMsg *pMsg, SClientHbReq *pHbReq,
                                         SClientHbBatchRsp *pBatchRsp) {
   SProfileMgmt *pMgmt = &pMnode->profileMgmt;
@@ -503,7 +527,7 @@ static int32_t mndProcessQueryHeartBeat(SMnode *pMnode, SRpcMsg *pMsg, SClientHb
 
     rspBasic->connId = pConn->id;
     rspBasic->totalDnodes = mndGetDnodeSize(pMnode);
-    rspBasic->onlineDnodes = 1;  // TODO
+    mndGetOnlineDnodeNum(pMnode, &rspBasic->onlineDnodes);
     mndGetMnodeEpSet(pMnode, &rspBasic->epSet);
 
     mndCreateQnodeList(pMnode, &rspBasic->pQnodeList, -1);
@@ -694,6 +718,28 @@ static int32_t mndProcessKillConnReq(SRpcMsg *pReq) {
   }
 }
 
+static int32_t mndProcessSvrVerReq(SRpcMsg *pReq) {
+  int32_t code = -1;
+  SServerVerRsp rsp = {0};
+  strcpy(rsp.ver, version);
+  
+  int32_t contLen = tSerializeSServerVerRsp(NULL, 0, &rsp);
+  if (contLen < 0) goto _over;
+  void *pRsp = rpcMallocCont(contLen);
+  if (pRsp == NULL) goto _over;
+  tSerializeSServerVerRsp(pRsp, contLen, &rsp);
+
+  pReq->info.rspLen = contLen;
+  pReq->info.rsp = pRsp;
+
+  code = 0;
+
+_over:
+
+  return code;
+}
+
+
 static int32_t mndRetrieveConns(SRpcMsg *pReq, SShowObj *pShow, SSDataBlock *pBlock, int32_t rows) {
   SMnode   *pMnode = pReq->info.node;
   SSdb     *pSdb = pMnode->pSdb;

source/libs/catalog/inc/catalogInt.h

@@ -76,6 +76,7 @@ typedef enum {
   CTG_TASK_GET_INDEX,
   CTG_TASK_GET_UDF,
   CTG_TASK_GET_USER,
+  CTG_TASK_GET_SVR_VER,
 } CTG_TASK_TYPE;
 
 typedef enum {
@@ -224,6 +225,7 @@ typedef struct SCtgJob {
   int32_t           dbInfoNum;
   int32_t           tbIndexNum;
   int32_t           tbCfgNum;
+  int32_t           svrVerNum;
 } SCtgJob;
 
 typedef struct SCtgMsgCtx {
@@ -578,8 +580,9 @@ int32_t ctgGetTbMetaFromMnode(SCatalog* pCtg, SRequestConnInfo *pConn, const SNa
 int32_t ctgGetTbMetaFromVnode(SCatalog* pCtg, SRequestConnInfo *pConn, const SName* pTableName, SVgroupInfo *vgroupInfo, STableMetaOutput* out, SCtgTask* pTask);
 int32_t ctgGetTableCfgFromVnode(SCatalog* pCtg, SRequestConnInfo *pConn, const SName* pTableName, SVgroupInfo *vgroupInfo, STableCfg **out, SCtgTask* pTask);
 int32_t ctgGetTableCfgFromMnode(SCatalog* pCtg, SRequestConnInfo *pConn, const SName* pTableName, STableCfg **out, SCtgTask* pTask);
+int32_t ctgGetSvrVerFromMnode(SCatalog* pCtg, SRequestConnInfo *pConn, char **out, SCtgTask* pTask);
 
-int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, uint64_t reqId, const SCatalogReq* pReq, catalogCallback fp, void* param, int32_t* taskNum);
+int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, const SCatalogReq* pReq, catalogCallback fp, void* param, int32_t* taskNum);
 int32_t ctgLaunchJob(SCtgJob *pJob);
 int32_t ctgMakeAsyncRes(SCtgJob *pJob);
 int32_t ctgLaunchSubTask(SCtgTask *pTask, CTG_TASK_TYPE type, ctgSubTaskCbFp fp, void* param);

source/libs/catalog/src/catalog.c

@@ -1051,7 +1051,7 @@ _return:
   CTG_API_LEAVE(code);
 }
 
-int32_t catalogAsyncGetAllMeta(SCatalog* pCtg, SRequestConnInfo *pConn, uint64_t reqId, const SCatalogReq* pReq, catalogCallback fp, void* param, int64_t* jobId) {
+int32_t catalogAsyncGetAllMeta(SCatalog* pCtg, SRequestConnInfo *pConn, const SCatalogReq* pReq, catalogCallback fp, void* param, int64_t* jobId) {
   CTG_API_ENTER();
 
   if (NULL == pCtg || NULL == pConn || NULL == pReq || NULL == fp || NULL == param) {
@@ -1060,7 +1060,7 @@ int32_t catalogAsyncGetAllMeta(SCatalog* pCtg, SRequestConnInfo *pConn, uint64_t
 
   int32_t code = 0, taskNum = 0;
   SCtgJob *pJob = NULL;
-  CTG_ERR_JRET(ctgInitJob(pCtg, pConn, &pJob, reqId, pReq, fp, param, &taskNum));
+  CTG_ERR_JRET(ctgInitJob(pCtg, pConn, &pJob, pReq, fp, param, &taskNum));
   if (taskNum <= 0) {
     SMetaData* pMetaData = taosMemoryCalloc(1, sizeof(SMetaData));
     fp(pMetaData, param, TSDB_CODE_SUCCESS);
@@ -1247,6 +1247,22 @@ _return:
   CTG_API_LEAVE(code);
 }
 
+int32_t catalogGetServerVersion(SCatalog* pCtg, SRequestConnInfo *pConn, char** pVersion) {
+  CTG_API_ENTER();
+  
+  if (NULL == pCtg || NULL == pConn || NULL == pVersion) {
+    CTG_API_LEAVE(TSDB_CODE_CTG_INVALID_INPUT);
+  }
+
+  int32_t code = 0;
+  CTG_ERR_JRET(ctgGetSvrVerFromMnode(pCtg, pConn, pVersion, NULL));
+  
+_return:
+
+  CTG_API_LEAVE(code);
+}
+
+
 int32_t catalogUpdateUserAuthInfo(SCatalog* pCtg, SGetUserAuthRsp* pAuth) {
   CTG_API_ENTER();
 

source/libs/catalog/src/ctgAsync.c

@@ -255,6 +255,20 @@ int32_t ctgInitGetUserTask(SCtgJob *pJob, int32_t taskIdx, void* param) {
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t ctgInitGetSvrVerTask(SCtgJob *pJob, int32_t taskIdx, void* param) {
+  SCtgTask task = {0};
+
+  task.type = CTG_TASK_GET_SVR_VER;
+  task.taskId = taskIdx;
+  task.pJob = pJob;
+
+  taosArrayPush(pJob->pTasks, &task);
+
+  qDebug("QID:0x%" PRIx64 " [%dth] task type %s initialized", pJob->queryId, taskIdx, ctgTaskTypeStr(task.type));
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t ctgInitGetTbIndexTask(SCtgJob *pJob, int32_t taskIdx, void* param) {
   SName *name = (SName*)param;
   SCtgTask task = {0};
@@ -413,7 +427,7 @@ int32_t ctgInitTask(SCtgJob *pJob, CTG_TASK_TYPE type, void* param, int32_t *tas
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, uint64_t reqId, const SCatalogReq* pReq, catalogCallback fp, void* param, int32_t* taskNum) {
+int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, const SCatalogReq* pReq, catalogCallback fp, void* param, int32_t* taskNum) {
   int32_t code = 0;
   int32_t tbMetaNum = (int32_t)taosArrayGetSize(pReq->pTableMeta);
   int32_t dbVgNum = (int32_t)taosArrayGetSize(pReq->pDbVgroup);
@@ -421,6 +435,7 @@ int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, uint6
   int32_t udfNum = (int32_t)taosArrayGetSize(pReq->pUdf);
   int32_t qnodeNum = pReq->qNodeRequired ? 1 : 0;
   int32_t dnodeNum = pReq->dNodeRequired ? 1 : 0;
+  int32_t svrVerNum = pReq->svrVerRequired ? 1 : 0;
   int32_t dbCfgNum = (int32_t)taosArrayGetSize(pReq->pDbCfg);
   int32_t indexNum = (int32_t)taosArrayGetSize(pReq->pIndex);
   int32_t userNum = (int32_t)taosArrayGetSize(pReq->pUser);
@@ -428,21 +443,21 @@ int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, uint6
   int32_t tbIndexNum = (int32_t)taosArrayGetSize(pReq->pTableIndex);
   int32_t tbCfgNum = (int32_t)taosArrayGetSize(pReq->pTableCfg);
 
-  *taskNum = tbMetaNum + dbVgNum + udfNum + tbHashNum + qnodeNum + dnodeNum + dbCfgNum + indexNum + userNum + dbInfoNum + tbIndexNum + tbCfgNum;
+  *taskNum = tbMetaNum + dbVgNum + udfNum + tbHashNum + qnodeNum + dnodeNum + svrVerNum + dbCfgNum + indexNum + userNum + dbInfoNum + tbIndexNum + tbCfgNum;
   if (*taskNum <= 0) {
-    ctgDebug("Empty input for job, no need to retrieve meta, reqId:0x%" PRIx64, reqId);
+    ctgDebug("Empty input for job, no need to retrieve meta, reqId:0x%" PRIx64, pConn->requestId);
     return TSDB_CODE_SUCCESS;
   }
 
   *job = taosMemoryCalloc(1, sizeof(SCtgJob));
   if (NULL == *job) {
-    ctgError("failed to calloc, size:%d, reqId:0x%" PRIx64, (int32_t)sizeof(SCtgJob), reqId);
+    ctgError("failed to calloc, size:%d, reqId:0x%" PRIx64, (int32_t)sizeof(SCtgJob), pConn->requestId);
     CTG_ERR_RET(TSDB_CODE_OUT_OF_MEMORY);
   }
 
   SCtgJob *pJob = *job;
   
-  pJob->queryId = reqId;
+  pJob->queryId = pConn->requestId;
   pJob->userFp = fp;
   pJob->pCtg    = pCtg;
   pJob->conn    = *pConn;
@@ -460,6 +475,7 @@ int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, uint6
   pJob->dbInfoNum = dbInfoNum;
   pJob->tbIndexNum = tbIndexNum;
   pJob->tbCfgNum = tbCfgNum;
+  pJob->svrVerNum = svrVerNum;
 
   pJob->pTasks = taosArrayInit(*taskNum, sizeof(SCtgTask));
 
@@ -530,6 +546,10 @@ int32_t ctgInitJob(SCatalog* pCtg, SRequestConnInfo *pConn, SCtgJob** job, uint6
     CTG_ERR_JRET(ctgInitTask(pJob, CTG_TASK_GET_DNODE, NULL, NULL));
   }
 
+  if (svrVerNum) {
+    CTG_ERR_JRET(ctgInitTask(pJob, CTG_TASK_GET_SVR_VER, NULL, NULL));
+  }
+
   pJob->refId = taosAddRef(gCtgMgmt.jobPool, pJob);
   if (pJob->refId < 0) {
     ctgError("add job to ref failed, error: %s", tstrerror(terrno));
@@ -728,6 +748,21 @@ int32_t ctgDumpUserRes(SCtgTask* pTask) {
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t ctgDumpSvrVer(SCtgTask* pTask) {
+  SCtgJob* pJob = pTask->pJob;
+  if (NULL == pJob->jobRes.pSvrVer) {
+    pJob->jobRes.pSvrVer = taosMemoryCalloc(1, sizeof(SMetaRes));
+    if (NULL == pJob->jobRes.pSvrVer) {
+      CTG_ERR_RET(TSDB_CODE_OUT_OF_MEMORY);
+    }
+  }
+
+  pJob->jobRes.pSvrVer->code = pTask->code;
+  pJob->jobRes.pSvrVer->pRes = pTask->res;
+  
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t ctgInvokeSubCb(SCtgTask *pTask) {
   int32_t code = 0;
   
@@ -1156,6 +1191,20 @@ _return:
   CTG_RET(code);
 }
 
+int32_t ctgHandleGetSvrVerRsp(SCtgTask* pTask, int32_t reqType, const SDataBuf *pMsg, int32_t rspCode) {
+  int32_t code = 0;
+
+  CTG_ERR_JRET(ctgProcessRspMsg(&pTask->msgCtx.out, reqType, pMsg->pData, pMsg->len, rspCode, pTask->msgCtx.target));
+
+  TSWAP(pTask->res, pTask->msgCtx.out);
+  
+_return:
+
+  ctgHandleTaskEnd(pTask, code);
+
+  CTG_RET(code);
+}
+
 int32_t ctgAsyncRefreshTbMeta(SCtgTask *pTask) {
   SCatalog* pCtg = pTask->pJob->pCtg; 
   SRequestConnInfo* pConn = &pTask->pJob->conn;
@@ -1459,6 +1508,15 @@ int32_t ctgLaunchGetUserTask(SCtgTask *pTask) {
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t ctgLaunchGetSvrVerTask(SCtgTask *pTask) {
+  SCatalog* pCtg = pTask->pJob->pCtg; 
+  SRequestConnInfo* pConn = &pTask->pJob->conn;
+
+  CTG_ERR_RET(ctgGetSvrVerFromMnode(pCtg, pConn, NULL, pTask));
+
+  return TSDB_CODE_SUCCESS;
+}
+
 int32_t ctgRelaunchGetTbMetaTask(SCtgTask *pTask) {
   ctgResetTbMetaTask(pTask);
 
@@ -1532,6 +1590,7 @@ SCtgAsyncFps gCtgAsyncFps[] = {
   {ctgInitGetIndexTask,   ctgLaunchGetIndexTask,   ctgHandleGetIndexRsp,   ctgDumpIndexRes,   NULL,               NULL},
   {ctgInitGetUdfTask,     ctgLaunchGetUdfTask,     ctgHandleGetUdfRsp,     ctgDumpUdfRes,     NULL,               NULL},
   {ctgInitGetUserTask,    ctgLaunchGetUserTask,    ctgHandleGetUserRsp,    ctgDumpUserRes,    NULL,               NULL},
+  {ctgInitGetSvrVerTask,  ctgLaunchGetSvrVerTask,  ctgHandleGetSvrVerRsp,  ctgDumpSvrVer,     NULL,               NULL},
 };
 
 int32_t ctgMakeAsyncRes(SCtgJob *pJob) {
@@ -1633,7 +1692,7 @@ int32_t ctgLaunchJob(SCtgJob *pJob) {
   for (int32_t i = 0; i < taskNum; ++i) {
     SCtgTask *pTask = taosArrayGet(pJob->pTasks, i);
 
-    qDebug("QID:0x%" PRIx64 " ctg start to launch task %d", pJob->queryId, pTask->taskId);
+    qDebug("QID:0x%" PRIx64 " ctg launch [%dth] task", pJob->queryId, pTask->taskId);
     CTG_ERR_RET((*gCtgAsyncFps[pTask->type].launchFp)(pTask));
     pTask->status = CTG_TASK_LAUNCHED;
   }

source/libs/catalog/src/ctgDbg.c

@@ -210,7 +210,7 @@ int32_t ctgdLaunchAsyncCall(SCatalog* pCtg, SRequestConnInfo* pConn, uint64_t re
   
   int64_t jobId = 0;
 
-  CTG_ERR_JRET(catalogAsyncGetAllMeta(pCtg, pConn, reqId, &req, ctgdUserCallback, param, &jobId));
+  CTG_ERR_JRET(catalogAsyncGetAllMeta(pCtg, pConn, &req, ctgdUserCallback, param, &jobId));
 
 _return:
 

source/libs/catalog/src/ctgRemote.c

@@ -217,6 +217,21 @@ int32_t ctgProcessRspMsg(void* out, int32_t reqType, char* msg, int32_t msgSize,
       qDebug("Got stb cfg from mnode, tbFName:%s", target);
       break;
     }    
+    case TDMT_MND_SERVER_VERSION: {
+      if (TSDB_CODE_SUCCESS != rspCode) {
+        qError("error rsp for svr ver from mnode, error:%s", tstrerror(rspCode));
+        CTG_ERR_RET(rspCode);
+      }
+      
+      code = queryProcessMsgRsp[TMSG_INDEX(reqType)](out, msg, msgSize);
+      if (code) {
+        qError("Process svr ver rsp failed, error:%s", tstrerror(code));
+        CTG_ERR_RET(code);
+      }
+      
+      qDebug("Got svr ver from mnode");
+      break;
+    }
     default:
       qError("invalid req type %s", TMSG_INFO(reqType));
       return TSDB_CODE_APP_ERROR;
@@ -811,4 +826,38 @@ int32_t ctgGetTableCfgFromMnode(SCatalog* pCtg, SRequestConnInfo *pConn, const S
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t ctgGetSvrVerFromMnode(SCatalog* pCtg, SRequestConnInfo *pConn, char **out, SCtgTask* pTask) {
+  char *msg = NULL;
+  int32_t msgLen = 0;
+  int32_t reqType = TDMT_MND_SERVER_VERSION;
+  void*(*mallocFp)(int32_t) = pTask ? taosMemoryMalloc : rpcMallocCont;
+
+  qDebug("try to get svr ver from mnode");
+
+  int32_t code = queryBuildMsg[TMSG_INDEX(reqType)](NULL, &msg, 0, &msgLen, mallocFp);
+  if (code) {
+    ctgError("Build get svr ver msg failed, code:%s", tstrerror(code));
+    CTG_ERR_RET(code);
+  }
+
+  if (pTask) {
+    CTG_ERR_RET(ctgUpdateMsgCtx(&pTask->msgCtx, reqType, NULL, NULL));
+    
+    CTG_RET(ctgAsyncSendMsg(pCtg, pConn, pTask, reqType, msg, msgLen));
+  }
+  
+  SRpcMsg rpcMsg = {
+      .msgType = reqType,
+      .pCont   = msg,
+      .contLen = msgLen,
+  };
+
+  SRpcMsg rpcRsp = {0};
+  rpcSendRecv(pConn->pTrans, &pConn->mgmtEps, &rpcMsg, &rpcRsp);
+
+  CTG_ERR_RET(ctgProcessRspMsg(out, reqType, rpcRsp.pCont, rpcRsp.contLen, rpcRsp.code, NULL));
+  
+  return TSDB_CODE_SUCCESS;
+}
+
 

source/libs/catalog/src/ctgUtil.c

@@ -45,6 +45,8 @@ char *ctgTaskTypeStr(CTG_TASK_TYPE type) {
       return "[get udf]";
     case CTG_TASK_GET_USER:
       return "[get user]";
+    case CTG_TASK_GET_SVR_VER:
+      return "[get svr ver]";
     default:
       return "unknown";
   }
@@ -103,8 +105,13 @@ void ctgFreeSMetaData(SMetaData* pData) {
   taosArrayDestroy(pData->pQnodeList);
   pData->pQnodeList = NULL;
 
+  taosArrayDestroy(pData->pDnodeList);
+  pData->pDnodeList = NULL;
+
   taosArrayDestroy(pData->pTableCfg);
   pData->pTableCfg = NULL;
+
+  taosMemoryFreeClear(pData->pSvrVer);
 }
 
 void ctgFreeSCtgUserAuth(SCtgUserAuth *userCache) {
@@ -346,20 +353,8 @@ void ctgResetTbMetaTask(SCtgTask* pTask) {
 
 void ctgFreeTaskRes(CTG_TASK_TYPE type, void **pRes) {
   switch (type) {
-    case CTG_TASK_GET_QNODE: {
-      taosArrayDestroy((SArray*)*pRes);
-      *pRes = NULL;
-      break;
-    }
-    case CTG_TASK_GET_DNODE: {
-      taosArrayDestroy((SArray*)*pRes);
-      *pRes = NULL;
-      break;
-    }
-    case CTG_TASK_GET_TB_META: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
+    case CTG_TASK_GET_QNODE:
+    case CTG_TASK_GET_DNODE:
     case CTG_TASK_GET_DB_VGROUP: {
       taosArrayDestroy((SArray*)*pRes);
       *pRes = NULL;
@@ -373,14 +368,6 @@ void ctgFreeTaskRes(CTG_TASK_TYPE type, void **pRes) {
       }
       break;
     }
-    case CTG_TASK_GET_DB_INFO: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
-    case CTG_TASK_GET_TB_HASH: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
     case CTG_TASK_GET_TB_INDEX: {
       taosArrayDestroyEx(*pRes, tFreeSTableIndexInfo);
       *pRes = NULL;
@@ -394,15 +381,13 @@ void ctgFreeTaskRes(CTG_TASK_TYPE type, void **pRes) {
       }
       break;
     }
-    case CTG_TASK_GET_INDEX: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
-    case CTG_TASK_GET_UDF: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
-    case CTG_TASK_GET_USER: {
+    case CTG_TASK_GET_TB_HASH:
+    case CTG_TASK_GET_DB_INFO:
+    case CTG_TASK_GET_INDEX:
+    case CTG_TASK_GET_UDF: 
+    case CTG_TASK_GET_USER: 
+    case CTG_TASK_GET_SVR_VER:
+    case CTG_TASK_GET_TB_META: {
       taosMemoryFreeClear(*pRes);
       break;
     }
@@ -415,20 +400,12 @@ void ctgFreeTaskRes(CTG_TASK_TYPE type, void **pRes) {
 
 void ctgFreeSubTaskRes(CTG_TASK_TYPE type, void **pRes) {
   switch (type) {
-    case CTG_TASK_GET_QNODE: {
-      taosArrayDestroy((SArray*)*pRes);
-      *pRes = NULL;
-      break;
-    }
+    case CTG_TASK_GET_QNODE:
     case CTG_TASK_GET_DNODE: {
       taosArrayDestroy((SArray*)*pRes);
       *pRes = NULL;
       break;
     }
-    case CTG_TASK_GET_TB_META: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
     case CTG_TASK_GET_DB_VGROUP: {
       if (*pRes) {
         SDBVgInfo* pInfo = (SDBVgInfo*)*pRes;
@@ -445,14 +422,6 @@ void ctgFreeSubTaskRes(CTG_TASK_TYPE type, void **pRes) {
       }
       break;
     }
-    case CTG_TASK_GET_DB_INFO: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
-    case CTG_TASK_GET_TB_HASH: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
     case CTG_TASK_GET_TB_INDEX: {
       taosArrayDestroyEx(*pRes, tFreeSTableIndexInfo);
       *pRes = NULL;
@@ -466,14 +435,12 @@ void ctgFreeSubTaskRes(CTG_TASK_TYPE type, void **pRes) {
       }
       break;
     }
-    case CTG_TASK_GET_INDEX: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
-    case CTG_TASK_GET_UDF: {
-      taosMemoryFreeClear(*pRes);
-      break;
-    }
+    case CTG_TASK_GET_TB_META:    
+    case CTG_TASK_GET_DB_INFO:
+    case CTG_TASK_GET_TB_HASH:
+    case CTG_TASK_GET_INDEX: 
+    case CTG_TASK_GET_UDF: 
+    case CTG_TASK_GET_SVR_VER: 
     case CTG_TASK_GET_USER: {
       taosMemoryFreeClear(*pRes);
       break;
@@ -497,10 +464,6 @@ void ctgClearSubTaskRes(SCtgSubRes *pRes) {
 
 void ctgFreeTaskCtx(SCtgTask* pTask) {
   switch (pTask->type) {
-    case CTG_TASK_GET_QNODE: {
-      taosMemoryFreeClear(pTask->taskCtx);      
-      break;
-    }
     case CTG_TASK_GET_TB_META: {
       SCtgTbMetaCtx* taskCtx = (SCtgTbMetaCtx*)pTask->taskCtx;
       taosMemoryFreeClear(taskCtx->pName);
@@ -511,18 +474,6 @@ void ctgFreeTaskCtx(SCtgTask* pTask) {
       taosMemoryFreeClear(pTask->taskCtx);
       break;
     }
-    case CTG_TASK_GET_DB_VGROUP: {
-      taosMemoryFreeClear(pTask->taskCtx);      
-      break;
-    }
-    case CTG_TASK_GET_DB_CFG: {
-      taosMemoryFreeClear(pTask->taskCtx);
-      break;
-    }
-    case CTG_TASK_GET_DB_INFO: {
-      taosMemoryFreeClear(pTask->taskCtx);      
-      break;
-    }
     case CTG_TASK_GET_TB_HASH: {
       SCtgTbHashCtx* taskCtx = (SCtgTbHashCtx*)pTask->taskCtx;
       taosMemoryFreeClear(taskCtx->pName);
@@ -542,14 +493,12 @@ void ctgFreeTaskCtx(SCtgTask* pTask) {
       taosMemoryFreeClear(pTask->taskCtx);
       break;
     }
-    case CTG_TASK_GET_INDEX: {
-      taosMemoryFreeClear(pTask->taskCtx);
-      break;
-    }
-    case CTG_TASK_GET_UDF: {
-      taosMemoryFreeClear(pTask->taskCtx);
-      break;
-    }
+    case CTG_TASK_GET_DB_VGROUP:
+    case CTG_TASK_GET_DB_CFG:
+    case CTG_TASK_GET_DB_INFO:    
+    case CTG_TASK_GET_INDEX:
+    case CTG_TASK_GET_UDF:
+    case CTG_TASK_GET_QNODE:    
     case CTG_TASK_GET_USER: {
       taosMemoryFreeClear(pTask->taskCtx);
       break;

source/libs/parser/src/parTranslater.c

@@ -4611,7 +4611,7 @@ static int32_t extractShowCreateTableResultSchema(int32_t* numOfCols, SSchema**
   return TSDB_CODE_SUCCESS;
 }
 
-static int32_t extractShowLocalVariablesResultSchema(int32_t* numOfCols, SSchema** pSchema) {
+static int32_t extractShowVariablesResultSchema(int32_t* numOfCols, SSchema** pSchema) {
   *numOfCols = 2;
   *pSchema = taosMemoryCalloc((*numOfCols), sizeof(SSchema));
   if (NULL == (*pSchema)) {
@@ -4649,7 +4649,8 @@ int32_t extractResultSchema(const SNode* pRoot, int32_t* numOfCols, SSchema** pS
     case QUERY_NODE_SHOW_CREATE_STABLE_STMT:
       return extractShowCreateTableResultSchema(numOfCols, pSchema);
     case QUERY_NODE_SHOW_LOCAL_VARIABLES_STMT:
-      return extractShowLocalVariablesResultSchema(numOfCols, pSchema);
+    case QUERY_NODE_SHOW_VARIABLES_STMT:
+      return extractShowVariablesResultSchema(numOfCols, pSchema);
     default:
       break;
   }
@@ -5874,7 +5875,6 @@ static int32_t rewriteQuery(STranslateContext* pCxt, SQuery* pQuery) {
     case QUERY_NODE_SHOW_CLUSTER_STMT:
     case QUERY_NODE_SHOW_TOPICS_STMT:
     case QUERY_NODE_SHOW_TRANSACTIONS_STMT:
-    case QUERY_NODE_SHOW_VARIABLES_STMT:
     case QUERY_NODE_SHOW_APPS_STMT:
       code = rewriteShow(pCxt, pQuery);
       break;
@@ -5974,6 +5974,14 @@ static int32_t setQuery(STranslateContext* pCxt, SQuery* pQuery) {
     case QUERY_NODE_ALTER_LOCAL_STMT:
       pQuery->execMode = QUERY_EXEC_MODE_LOCAL;
       break;
+    case QUERY_NODE_SHOW_VARIABLES_STMT:
+      pQuery->haveResultSet = true;
+      pQuery->execMode = QUERY_EXEC_MODE_RPC;
+      if (NULL != pCxt->pCmdMsg) {
+        TSWAP(pQuery->pCmdMsg, pCxt->pCmdMsg);
+        pQuery->msgType = pQuery->pCmdMsg->msgType;
+      }
+      break;      
     default:
       pQuery->execMode = QUERY_EXEC_MODE_RPC;
       if (NULL != pCxt->pCmdMsg) {

source/libs/qcom/src/querymsg.c

@@ -144,6 +144,23 @@ int32_t queryBuildDnodeListMsg(void *input, char **msg, int32_t msgSize, int32_t
   return TSDB_CODE_SUCCESS;
 }
 
+int32_t queryBuildGetSerVerMsg(void *input, char **msg, int32_t msgSize, int32_t *msgLen, void*(*mallcFp)(int32_t)) {
+  if (NULL == msg || NULL == msgLen) {
+    return TSDB_CODE_TSC_INVALID_INPUT;
+  }
+
+  SServerVerReq req = {0};
+
+  int32_t bufLen = tSerializeSServerVerReq(NULL, 0, &req);
+  void   *pBuf = (*mallcFp)(bufLen);
+  tSerializeSServerVerReq(pBuf, bufLen, &req);
+
+  *msg = pBuf;
+  *msgLen = bufLen;
+
+  return TSDB_CODE_SUCCESS;
+}
+
 
 int32_t queryBuildGetDBCfgMsg(void *input, char **msg, int32_t msgSize, int32_t *msgLen, void*(*mallcFp)(int32_t)) {
   if (NULL == msg || NULL == msgLen) {
@@ -467,6 +484,26 @@ int32_t queryProcessDnodeListRsp(void *output, char *msg, int32_t msgSize) {
   return code;
 }
 
+int32_t queryProcessGetSerVerRsp(void *output, char *msg, int32_t msgSize) {
+  SServerVerRsp out = {0};
+  int32_t       code = 0;
+
+  if (NULL == output || NULL == msg || msgSize <= 0) {
+    code = TSDB_CODE_TSC_INVALID_INPUT;
+    return code;
+  }
+
+  if (tDeserializeSServerVerRsp(msg, msgSize, &out) != 0) {
+    qError("invalid svr ver rsp msg, msgSize:%d", msgSize);
+    code = TSDB_CODE_INVALID_MSG;
+    return code;
+  }
+
+  *(char**)output = strdup(out.ver);
+
+  return code;
+}
+
 
 int32_t queryProcessGetDbCfgRsp(void *output, char *msg, int32_t msgSize) {
   SDbCfgRsp out = {0};
@@ -583,6 +620,7 @@ void initQueryModuleMsgHandle() {
   queryBuildMsg[TMSG_INDEX(TDMT_MND_GET_TABLE_INDEX)]  = queryBuildGetTbIndexMsg;
   queryBuildMsg[TMSG_INDEX(TDMT_VND_TABLE_CFG)]        = queryBuildGetTbCfgMsg;
   queryBuildMsg[TMSG_INDEX(TDMT_MND_TABLE_CFG)]        = queryBuildGetTbCfgMsg;
+  queryBuildMsg[TMSG_INDEX(TDMT_MND_SERVER_VERSION)]   = queryBuildGetSerVerMsg;
 
   queryProcessMsgRsp[TMSG_INDEX(TDMT_VND_TABLE_META)]      = queryProcessTableMetaRsp;
   queryProcessMsgRsp[TMSG_INDEX(TDMT_MND_TABLE_META)]      = queryProcessTableMetaRsp;
@@ -596,6 +634,7 @@ void initQueryModuleMsgHandle() {
   queryProcessMsgRsp[TMSG_INDEX(TDMT_MND_GET_TABLE_INDEX)] = queryProcessGetTbIndexRsp;
   queryProcessMsgRsp[TMSG_INDEX(TDMT_VND_TABLE_CFG)]       = queryProcessGetTbCfgRsp;
   queryProcessMsgRsp[TMSG_INDEX(TDMT_MND_TABLE_CFG)]       = queryProcessGetTbCfgRsp;
+  queryProcessMsgRsp[TMSG_INDEX(TDMT_MND_SERVER_VERSION)]  = queryProcessGetSerVerRsp;
 }
 
 #pragma GCC diagnostic pop