diff --git a/include/common/taosmsg.h b/include/common/taosmsg.h
index 2ce6da98069e3bf83bd99849c3205397c50fec81..fd55a11b529aa3eede25fe451366d63cc489f0d6 100644
--- a/include/common/taosmsg.h
+++ b/include/common/taosmsg.h
@@ -214,6 +214,12 @@ typedef enum _mgmt_table {
 
 extern char *taosMsg[];
 
+typedef struct SBuildTableMetaInput {
+  int32_t   vgId;
+  STagData *tagData;
+  char     *tableFullName;
+} SBuildTableMetaInput;
+
 #pragma pack(push, 1)
 
 // null-terminated string instead of char array to avoid too many memory consumption in case of more than 1M tableMeta
@@ -768,6 +774,7 @@ typedef struct {
 } SStableInfoMsg;
 
 typedef struct {
+  SMsgHead  msgHead;
   char   tableFname[TSDB_TABLE_FNAME_LEN];
   int8_t createFlag;
   char   tags[];
diff --git a/include/libs/catalog/catalog.h b/include/libs/catalog/catalog.h
index 8aacede5febab228023c0eab451bfe8eaae1cbe3..2092f53ba1d4316a0c72416b056f5709f24eae3c 100644
--- a/include/libs/catalog/catalog.h
+++ b/include/libs/catalog/catalog.h
@@ -30,6 +30,19 @@ extern "C" {
 
 struct SCatalog;
 
+typedef struct SVgroupInfo {
+  int32_t    vgId;
+  int8_t     numOfEps;
+  SEpAddrMsg epAddr[TSDB_MAX_REPLICA];
+} SVgroupInfo;
+
+typedef struct SDBVgroupInfo {
+  int32_t vgroupVersion;
+  SArray *vgId;
+  int32_t hashRange;
+  int32_t hashNum;
+} SDBVgroupInfo;
+
 typedef struct SCatalogReq {
   char    clusterId[TSDB_CLUSTER_ID_LEN];  //????
   SArray *pTableName;     // table full name
@@ -38,8 +51,8 @@ typedef struct SCatalogReq {
 } SCatalogReq;
 
 typedef struct SCatalogRsp {
-  SArray    *pTableMeta;  // tableMeta
-  SArray    *pVgroupInfo; // vgroupInfo list
+  SArray    *pTableMeta;  // STableMeta array
+  SArray    *pVgroupInfo; // SVgroupInfo list
   SArray    *pUdfList;    // udf info list
   SEpSet    *pEpSet;      // qnode epset list
 } SCatalogRsp;
@@ -78,11 +91,6 @@ typedef struct STableMeta {
   SSchema        schema[];
 } STableMeta;
 
-typedef struct SCatalogCfg {
-
-} SCatalogCfg;
-
-
 int32_t catalogInit(SCatalog *cfg);
 
 /**
@@ -91,9 +99,19 @@ int32_t catalogInit(SCatalog *cfg);
  * @param clusterId
  * @return
  */
-struct SCatalog* catalogGetHandle(const char *clusterId);
+int32_t catalogGetHandle(const char *clusterId, struct SCatalog** catalogHandle);
+
+int32_t catalogGetVgroupVersion(struct SCatalog* pCatalog, int32_t* version);
+
+int32_t catalogUpdateVgroupList(struct SCatalog* pCatalog, int32_t version, SArray* vgroupList);
+
+int32_t catalogGetDBVgroupVersion(struct SCatalog* pCatalog, const char* dbName, int32_t* version);
+
+int32_t catalogGetDBVgroupInfo(struct SCatalog* pCatalog, const char* dbName, SDBVgroupInfo* dbInfo);
+
+int32_t catalogUpdateDBVgroupInfo(struct SCatalog* pCatalog, const char* dbName, SDBVgroupInfo* dbInfo);
 
-int32_t catalogGetTableMeta(struct SCatalog* pCatalog, const SEpSet* pMgmtEps, const char* pTableName, const STagData* tagData, STableMeta* pTableMeta);
+int32_t catalogGetTableMeta(struct SCatalog* pCatalog, SRpcObj *pRpcObj, const SEpSet* pMgmtEps, const char* pTableName, const STagData* tagData, STableMeta* pTableMeta);
 
 
 /**
diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index 065f1ee0ab2bcc47706b0e17cab96d4182b227e0..a3a4297115faf70e217e26b7cab5a24cad2fb275 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -117,6 +117,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_TSC_INVALID_JSON              TAOS_DEF_ERROR_CODE(0, 0x0221)  //"Invalid JSON format")
 #define TSDB_CODE_TSC_INVALID_JSON_TYPE         TAOS_DEF_ERROR_CODE(0, 0x0222)  //"Invalid JSON data type")
 #define TSDB_CODE_TSC_VALUE_OUT_OF_RANGE        TAOS_DEF_ERROR_CODE(0, 0x0223)  //"Value out of range")
+#define TSDB_CODE_TSC_INVALID_INPUT             TAOS_DEF_ERROR_CODE(0, 0X0224)  //"Invalid tsc input")
 
 // mnode
 #define TSDB_CODE_MND_MSG_NOT_PROCESSED         TAOS_DEF_ERROR_CODE(0, 0x0300)
diff --git a/source/common/src/tmessage.c b/source/common/src/tmessage.c
index 8609e8f09a809a98f140afe28f8de27977362f27..0e732caa260f42cc2ca683c26b39a8c49d2cdeff 100644
--- a/source/common/src/tmessage.c
+++ b/source/common/src/tmessage.c
@@ -17,14 +17,16 @@
 
 #include "taosmsg.h"
 
-int32_t (*tscBuildMsg[TSDB_MSG_TYPE_MAX])(void* input, char **msg, int32_t msgSize) = {0};
+int32_t (*tscBuildMsg[TSDB_MSG_TYPE_MAX])(void* input, char **msg, int32_t msgSize, int32_t *msgLen) = {0};
 
 int32_t (*tscProcessMsgRsp[TSDB_MSG_TYPE_MAX])(void* output, char *msg, int32_t msgSize) = {0};
 
 
 void msgInit() {
-  tscBuildMsg[TSDB_MSG_TYPE_TABLE_META] = buildTableMetaReqMsg;
-  
+  tscBuildMsg[TSDB_MSG_TYPE_TABLE_META] = tscBuildTableMetaReqMsg;
+
+
+
   tscProcessMsgRsp[TSDB_MSG_TYPE_TABLE_META] = ;
 
 /*
@@ -104,4 +106,63 @@ void msgInit() {
 }
 
 
+char* msgSerializeTagData(STagData* pTagData, char* pMsg) {
+  int32_t n = (int32_t) strlen(pTagData->name);
+  *(int32_t*) pMsg = htonl(n);
+  pMsg += sizeof(n);
+
+  memcpy(pMsg, pTagData->name, n);
+  pMsg += n;
+
+  *(int32_t*)pMsg = htonl(pTagData->dataLen);
+  pMsg += sizeof(int32_t);
+
+  memcpy(pMsg, pTagData->data, pTagData->dataLen);
+  pMsg += pTagData->dataLen;
+
+  return pMsg;
+}
+
+
+int32_t tscBuildTableMetaReqMsg(void* input, char **msg, int32_t msgSize, int32_t *msgLen) {
+  if (NULL == input || NULL == msg || NULL == msgLen) {
+    return TSDB_CODE_TSC_INVALID_INPUT;
+  }
+
+  SBuildTableMetaInput* bInput = (SBuildTableMetaInput *)input;
+
+  int32_t estimateSize = sizeof(STableInfoMsg) + (bInput->tagData ? (sizeof(*bInput->tagData) + bInput->tagData->dataLen) : 0);
+  if (NULL == *msg || msgSize < estimateSize) {
+    tfree(*msg);
+    *msg = calloc(1, estimateSize);
+    if (NULL == *msg) {
+      return TSDB_CODE_TSC_OUT_OF_MEMORY;
+    }
+  }
+
+  STableInfoMsg *bMsg = (STableInfoMsg *)*msg;
+
+  bMsg->msgHead.vgId = bInput->vgId;
+
+  strncpy(bMsg->tableFname, bInput->tableFullName, sizeof(bMsg->tableFname));
+  bMsg->tableFname[sizeof(bMsg->tableFname) - 1] = 0;
+
+  int32_t autoCreate = (bInput->tagData && bInput->tagData->dataLen > 0);
+  
+  bMsg->createFlag = htons(autoCreate ? 1 : 0);
+  
+  char *pMsg = NULL;
+
+  // tag data exists
+  if (autoCreate) {
+    pMsg = msgSerializeTagData(bInput->tagData, (char *)bMsg->tags);
+  }
+
+  *msgLen = (int32_t)(pMsg - (char*)bMsg);
+
+  return TSDB_CODE_SUCCESS;
+}
+
+
+
 
diff --git a/source/libs/catalog/inc/catalogInt.h b/source/libs/catalog/inc/catalogInt.h
index 8703f1f0ceec0f815681ad93183594dded51c8aa..82d7d9c571a291f876e09aeed8651db6f95e63ef 100644
--- a/source/libs/catalog/inc/catalogInt.h
+++ b/source/libs/catalog/inc/catalogInt.h
@@ -24,8 +24,24 @@ extern "C" {
 
 #define CTG_DEFAULT_CLUSTER_NUMBER 3
 
-typedef struct SCatalog {
+typedef struct SVgroupListCache {
+  int32_t vgroupNum;
+  int32_t vgroupVersion;
+  SHashObj *cache;      //key:vgId, value:SVgroupInfo
+} SVgroupListCache;
+
+typedef struct SDBVgroupCache {
+  SHashObj *cache;      //key:dbname, value:SDBVgroupInfo
+} SDBVgroupCache;
 
+typedef struct STableMetaCache {
+  SHashObj *cache;     //key:fulltablename, value:STableMeta
+} STableMetaCache;
+
+typedef struct SCatalog {
+  SVgroupListCache vgroupCache;
+  SDBVgroupCache dbCache;
+  STableMetaCache tableCache;
 } SCatalog;
 
 typedef struct SCatalogMgmt {
diff --git a/source/libs/catalog/src/catalog.c b/source/libs/catalog/src/catalog.c
index a305df05d0c817b7e970b57fa53b582377c11d4d..e8b79bae4b64f3f40fadb744039e95be5e0e1a7d 100644
--- a/source/libs/catalog/src/catalog.c
+++ b/source/libs/catalog/src/catalog.c
@@ -24,8 +24,6 @@ int32_t catalogInit(SCatalog *cfg) {
     CTG_ERR_LRET(TSDB_CODE_CTG_INTERNAL_EROR, "init %d cluster cache failed", CTG_DEFAULT_CLUSTER_NUMBER);
   }
 
-  ctgGetVnodeInfo();
-
   return TSDB_CODE_SUCCESS;
 }
 
@@ -62,11 +60,31 @@ struct SCatalog* catalogGetHandle(const char *clusterId) {
   return clusterCtg;
 }
 
-int32_t catalogGetTableMeta(struct SCatalog* pCatalog, const SEpSet* pMgmtEps, const char* pTableName, STableMeta* pTableMeta) {
+int32_t catalogGetTableMeta(struct SCatalog* pCatalog, SRpcObj *pRpcObj, const SEpSet* pMgmtEps, const char* pTableName, const STagData* tagData, STableMeta* pTableMeta) {
   if (NULL == pCatalog || NULL == pMgmtEps || NULL == pTableName || NULL == pTableMeta) {
     return TSDB_CODE_CTG_INVALID_INPUT;
   }
 
+  SBuildTableMetaInput bInput = {0};
+  char *msg = NULL;
+  SEpSet *pVnodeEpSet = NULL;
+  int32_t msgLen = 0;
+
+  int32_t code = tscBuildMsg[TSDB_MSG_TYPE_TABLE_META](&bInput, &msg, 0, &msgLen);
+  if (code) {
+    return code;
+  }
+
+  SRpcMsg rpcMsg = {
+      .msgType = TSDB_MSG_TYPE_TABLE_META,
+      .pCont   = msg,
+      .contLen = msgLen,
+      .ahandle = (void*)pSql->self,
+      .handle  = NULL,
+      .code    = 0
+  };
+
+  rpcSendRequest(pRpcObj->pDnodeConn, pVnodeEpSet, &rpcMsg, &pSql->rpcRid);
 }
 
 
diff --git a/source/libs/parser/src/parserUtil.c b/source/libs/parser/src/parserUtil.c
index 3e83381a76e6145fa7157459f20c10460a3687e9..f154599aae9fd306438329ab074da4f18b643cba 100644
--- a/source/libs/parser/src/parserUtil.c
+++ b/source/libs/parser/src/parserUtil.c
@@ -1433,23 +1433,6 @@ void* vgroupInfoClear(SVgroupsInfo *vgroupList) {
   return NULL;
 }
 
-char* serializeTagData(STagData* pTagData, char* pMsg) {
-  int32_t n = (int32_t) strlen(pTagData->name);
-  *(int32_t*) pMsg = htonl(n);
-  pMsg += sizeof(n);
-
-  memcpy(pMsg, pTagData->name, n);
-  pMsg += n;
-
-  *(int32_t*)pMsg = htonl(pTagData->dataLen);
-  pMsg += sizeof(int32_t);
-
-  memcpy(pMsg, pTagData->data, pTagData->dataLen);
-  pMsg += pTagData->dataLen;
-
-  return pMsg;
-}
-
 int32_t copyTagData(STagData* dst, const STagData* src) {
   dst->dataLen = src->dataLen;
   tstrncpy(dst->name, src->name, tListLen(dst->name));
diff --git a/source/util/src/terror.c b/source/util/src/terror.c
index c4ca44f1d256f69a009286d7678d9d254405335a..a75ce747b229212f151bf2927f22c382ae95932f 100644
--- a/source/util/src/terror.c
+++ b/source/util/src/terror.c
@@ -127,6 +127,7 @@ TAOS_DEFINE_ERROR(TSDB_CODE_TSC_DUP_TAG_NAMES,            "duplicated tag names"
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_INVALID_JSON,             "Invalid JSON format")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_INVALID_JSON_TYPE,        "Invalid JSON data type")
 TAOS_DEFINE_ERROR(TSDB_CODE_TSC_VALUE_OUT_OF_RANGE,       "Value out of range")
+TAOS_DEFINE_ERROR(TSDB_CODE_TSC_INVALID_INPUT,            "Invalid tsc input")
 
 // mnode
 TAOS_DEFINE_ERROR(TSDB_CODE_MND_MSG_NOT_PROCESSED,        "Message not processed")