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refactor: multi-process test mode

This commit is contained in:
Shengliang Guan 2022-05-17 10:42:02 +08:00
parent 46d566d345
commit 23707bfcb9
6 changed files with 60 additions and 53 deletions
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11
source/dnode/mgmt/node_mgmt/inc/dmMgmt.h
View File

@ -31,12 +31,11 @@ typedef struct SMgmtWrapper SMgmtWrapper;
#define CHILD_PROC 1 #define CHILD_PROC 1
#define PARENT_PROC 2 #define PARENT_PROC 2
#define TEST_PROC 3 #define TEST_PROC 3
#define OnlyInSingleProc(ptype) (ptype == SINGLE_PROC) #define OnlyInSingleProc(wrapper) ((wrapper)->proc.ptype == SINGLE_PROC)
#define OnlyInChildProc(ptype) (ptype == CHILD_PROC) #define OnlyInChildProc(wrapper) ((wrapper)->proc.ptype == CHILD_PROC)
#define OnlyInParentProc(ptype) (ptype == PARENT_PROC) #define OnlyInParentProc(wrapper) ((wrapper)->proc.ptype == PARENT_PROC)
#define OnlyInTestProc(ptype) (ptype == TEST_PROC) #define InChildProc(wrapper) ((wrapper)->proc.ptype & CHILD_PROC)
#define InChildProc(ptype) (ptype & CHILD_PROC) #define InParentProc(wrapper) ((wrapper)->proc.ptype & PARENT_PROC)
#define InParentProc(ptype) (ptype & PARENT_PROC)
typedef struct { typedef struct {
int32_t head; int32_t head;

6
source/dnode/mgmt/node_mgmt/src/dmMgmt.c
View File

@ -164,7 +164,7 @@ int32_t dmInitDnode(SDnode *pDnode, EDndNodeType rtype) {
goto _OVER; goto _OVER;
} }
if (OnlyInSingleProc(pDnode->ptype) || InParentProc(pDnode->ptype)) { if (pDnode->ptype == SINGLE_PROC || (pDnode->ptype & PARENT_PROC)) {
pDnode->lockfile = dmCheckRunning(tsDataDir); pDnode->lockfile = dmCheckRunning(tsDataDir);
if (pDnode->lockfile == NULL) { if (pDnode->lockfile == NULL) {
goto _OVER; goto _OVER;
@ -231,7 +231,7 @@ int32_t dmMarkWrapper(SMgmtWrapper *pWrapper) {
int32_t code = 0; int32_t code = 0;
taosRLockLatch(&pWrapper->latch); taosRLockLatch(&pWrapper->latch);
if (pWrapper->deployed || (InParentProc(pWrapper->proc.ptype) && pWrapper->required)) { if (pWrapper->deployed || (InParentProc(pWrapper) && pWrapper->required)) {
int32_t refCount = atomic_add_fetch_32(&pWrapper->refCount, 1); int32_t refCount = atomic_add_fetch_32(&pWrapper->refCount, 1);
dTrace("node:%s, is marked, ref:%d", pWrapper->name, refCount); dTrace("node:%s, is marked, ref:%d", pWrapper->name, refCount);
} else { } else {
@ -276,7 +276,6 @@ void dmProcessNetTestReq(SDnode *pDnode, SRpcMsg *pReq) {
rsp.contLen = pReq->contLen; rsp.contLen = pReq->contLen;
} }
rpcSendResponse(&rsp); rpcSendResponse(&rsp);
rpcFreeCont(pReq->pCont);
} }
void dmProcessServerStartupStatus(SDnode *pDnode, SRpcMsg *pReq) { void dmProcessServerStartupStatus(SDnode *pDnode, SRpcMsg *pReq) {
@ -304,5 +303,4 @@ void dmProcessServerStartupStatus(SDnode *pDnode, SRpcMsg *pReq) {
_OVER: _OVER:
rpcSendResponse(&rspMsg); rpcSendResponse(&rspMsg);
rpcFreeCont(pReq->pCont);
} }

22
source/dnode/mgmt/node_mgmt/src/dmNodes.c
View File

@ -75,11 +75,11 @@ int32_t dmOpenNode(SMgmtWrapper *pWrapper) {
SMgmtOutputOpt output = {0}; SMgmtOutputOpt output = {0};
SMgmtInputOpt input = dmBuildMgmtInputOpt(pWrapper); SMgmtInputOpt input = dmBuildMgmtInputOpt(pWrapper);
if (pWrapper->ntype == DNODE || InChildProc(pWrapper->proc.ptype)) { if (pWrapper->ntype == DNODE || InChildProc(pWrapper)) {
tmsgSetDefaultMsgCb(&input.msgCb); tmsgSetDefaultMsgCb(&input.msgCb);
} }
if (OnlyInSingleProc(pWrapper->proc.ptype)) { if (OnlyInSingleProc(pWrapper)) {
dInfo("node:%s, start to open", pWrapper->name); dInfo("node:%s, start to open", pWrapper->name);
if ((*pWrapper->func.openFp)(&input, &output) != 0) { if ((*pWrapper->func.openFp)(&input, &output) != 0) {
dError("node:%s, failed to open since %s", pWrapper->name, terrstr()); dError("node:%s, failed to open since %s", pWrapper->name, terrstr());
@ -89,7 +89,7 @@ int32_t dmOpenNode(SMgmtWrapper *pWrapper) {
pWrapper->deployed = true; pWrapper->deployed = true;
} }
if (InParentProc(pWrapper->proc.ptype)) { if (InParentProc(pWrapper)) {
dDebug("node:%s, start to open", pWrapper->name); dDebug("node:%s, start to open", pWrapper->name);
if (dmCreateShm(pWrapper) != 0) { if (dmCreateShm(pWrapper) != 0) {
return -1; return -1;
@ -98,7 +98,7 @@ int32_t dmOpenNode(SMgmtWrapper *pWrapper) {
return -1; return -1;
} }
if (OnlyInParentProc(pWrapper->proc.ptype)) { if (OnlyInParentProc(pWrapper)) {
if (dmInitProc(pWrapper) != 0) { if (dmInitProc(pWrapper) != 0) {
dError("node:%s, failed to init proc since %s", pWrapper->name, terrstr()); dError("node:%s, failed to init proc since %s", pWrapper->name, terrstr());
return -1; return -1;
@ -118,7 +118,7 @@ int32_t dmOpenNode(SMgmtWrapper *pWrapper) {
dDebug("node:%s, has been opened in parent process", pWrapper->name); dDebug("node:%s, has been opened in parent process", pWrapper->name);
} }
if (InChildProc(pWrapper->proc.ptype)) { if (InChildProc(pWrapper)) {
dDebug("node:%s, start to open", pWrapper->name); dDebug("node:%s, start to open", pWrapper->name);
if ((*pWrapper->func.openFp)(&input, &output) != 0) { if ((*pWrapper->func.openFp)(&input, &output) != 0) {
dError("node:%s, failed to open since %s", pWrapper->name, terrstr()); dError("node:%s, failed to open since %s", pWrapper->name, terrstr());
@ -143,7 +143,7 @@ int32_t dmOpenNode(SMgmtWrapper *pWrapper) {
} }
int32_t dmStartNode(SMgmtWrapper *pWrapper) { int32_t dmStartNode(SMgmtWrapper *pWrapper) {
if (OnlyInParentProc(pWrapper->proc.ptype)) return 0; if (OnlyInParentProc(pWrapper)) return 0;
if (pWrapper->func.startFp != NULL) { if (pWrapper->func.startFp != NULL) {
dDebug("node:%s, start to start", pWrapper->name); dDebug("node:%s, start to start", pWrapper->name);
if ((*pWrapper->func.startFp)(pWrapper->pMgmt) != 0) { if ((*pWrapper->func.startFp)(pWrapper->pMgmt) != 0) {
@ -173,7 +173,7 @@ void dmCloseNode(SMgmtWrapper *pWrapper) {
taosMsleep(10); taosMsleep(10);
} }
if (OnlyInParentProc(pWrapper->proc.ptype)) { if (OnlyInParentProc(pWrapper)) {
int32_t pid = pWrapper->proc.pid; int32_t pid = pWrapper->proc.pid;
if (pid > 0 && taosProcExist(pid)) { if (pid > 0 && taosProcExist(pid)) {
dInfo("node:%s, send kill signal to the child process:%d", pWrapper->name, pid); dInfo("node:%s, send kill signal to the child process:%d", pWrapper->name, pid);
@ -191,7 +191,7 @@ void dmCloseNode(SMgmtWrapper *pWrapper) {
} }
taosWUnLockLatch(&pWrapper->latch); taosWUnLockLatch(&pWrapper->latch);
if (!OnlyInSingleProc(pWrapper->proc.ptype)) { if (!OnlyInSingleProc(pWrapper)) {
dmCleanupProc(pWrapper); dmCleanupProc(pWrapper);
} }
@ -242,7 +242,7 @@ static void dmCloseNodes(SDnode *pDnode) {
} }
static void dmWatchNodes(SDnode *pDnode) { static void dmWatchNodes(SDnode *pDnode) {
if (!OnlyInParentProc(pDnode->ptype)) return; if (pDnode->ptype != PARENT_PROC) return;
if (pDnode->rtype == NODE_END) return; if (pDnode->rtype == NODE_END) return;
taosThreadMutexLock(&pDnode->mutex); taosThreadMutexLock(&pDnode->mutex);
@ -251,7 +251,7 @@ static void dmWatchNodes(SDnode *pDnode) {
SProc *proc = &pWrapper->proc; SProc *proc = &pWrapper->proc;
if (!pWrapper->required) continue; if (!pWrapper->required) continue;
if (!OnlyInParentProc(proc->ptype)) continue; if (!OnlyInParentProc(pWrapper)) continue;
if (proc->pid <= 0 || !taosProcExist(proc->pid)) { if (proc->pid <= 0 || !taosProcExist(proc->pid)) {
dWarn("node:%s, process:%d is killed and needs to restart", pWrapper->name, proc->pid); dWarn("node:%s, process:%d is killed and needs to restart", pWrapper->name, proc->pid);
@ -274,7 +274,7 @@ int32_t dmRunDnode(SDnode *pDnode) {
} }
while (1) { while (1) {
if (!pDnode->stop) { if (pDnode->stop) {
dInfo("dnode is about to stop"); dInfo("dnode is about to stop");
dmSetStatus(pDnode, DND_STAT_STOPPED); dmSetStatus(pDnode, DND_STAT_STOPPED);
dmStopNodes(pDnode); dmStopNodes(pDnode);

12
source/dnode/mgmt/node_mgmt/src/dmProc.c
View File

@ -67,7 +67,7 @@ static SProcQueue *dmInitProcQueue(SProc *proc, char *ptr, int32_t size) {
return NULL; return NULL;
} }
if (InParentProc(proc->ptype)) { if (proc->ptype & DND_PROC_PARENT) {
if (dmInitProcMutex(queue) != 0) { if (dmInitProcMutex(queue) != 0) {
return NULL; return NULL;
} }
@ -392,12 +392,14 @@ static void *dmConsumParentQueue(void *param) {
rpcSendResponse(pRsp); rpcSendResponse(pRsp);
} else if (ftype == DND_FUNC_REGIST) { } else if (ftype == DND_FUNC_REGIST) {
pRsp = pHead; pRsp = pHead;
dTrace("node:%s, get regist msg:%p from pqueue, code:0x%04x handle:%p", proc->name, pRsp, code, pRsp->info.handle); dTrace("node:%s, get regist msg:%p from pqueue, code:0x%04x handle:%p", proc->name, pRsp, code,
pRsp->info.handle);
rpcRegisterBrokenLinkArg(pRsp); rpcRegisterBrokenLinkArg(pRsp);
rpcFreeCont(pBody); rpcFreeCont(pBody);
} else if (ftype == DND_FUNC_RELEASE) { } else if (ftype == DND_FUNC_RELEASE) {
pRsp = pHead; pRsp = pHead;
dTrace("node:%s, get release msg:%p from pqueue, code:0x%04x handle:%p", proc->name, pRsp, code, pRsp->info.handle); dTrace("node:%s, get release msg:%p from pqueue, code:0x%04x handle:%p", proc->name, pRsp, code,
pRsp->info.handle);
dmRemoveProcRpcHandle(proc, pRsp->info.handle); dmRemoveProcRpcHandle(proc, pRsp->info.handle);
rpcReleaseHandle(pRsp->info.handle, (int8_t)pRsp->code); rpcReleaseHandle(pRsp->info.handle, (int8_t)pRsp->code);
rpcFreeCont(pBody); rpcFreeCont(pBody);
@ -417,7 +419,7 @@ int32_t dmRunProc(SProc *proc) {
taosThreadAttrInit(&thAttr); taosThreadAttrInit(&thAttr);
taosThreadAttrSetDetachState(&thAttr, PTHREAD_CREATE_JOINABLE); taosThreadAttrSetDetachState(&thAttr, PTHREAD_CREATE_JOINABLE);
if (InParentProc(proc->ptype)) { if (proc->ptype & DND_PROC_PARENT) {
if (taosThreadCreate(&proc->pthread, &thAttr, dmConsumParentQueue, proc) != 0) { if (taosThreadCreate(&proc->pthread, &thAttr, dmConsumParentQueue, proc) != 0) {
terrno = TAOS_SYSTEM_ERROR(errno); terrno = TAOS_SYSTEM_ERROR(errno);
dError("node:%s, failed to create pthread since %s", proc->name, terrstr()); dError("node:%s, failed to create pthread since %s", proc->name, terrstr());
@ -426,7 +428,7 @@ int32_t dmRunProc(SProc *proc) {
dDebug("node:%s, thread:%" PRId64 " is created to consume pqueue", proc->name, proc->pthread); dDebug("node:%s, thread:%" PRId64 " is created to consume pqueue", proc->name, proc->pthread);
} }
if (InChildProc(proc->ptype)) { if (proc->ptype & DND_PROC_CHILD) {
if (taosThreadCreate(&proc->cthread, &thAttr, dmConsumChildQueue, proc) != 0) { if (taosThreadCreate(&proc->cthread, &thAttr, dmConsumChildQueue, proc) != 0) {
terrno = TAOS_SYSTEM_ERROR(errno); terrno = TAOS_SYSTEM_ERROR(errno);
dError("node:%s, failed to create cthread since %s", proc->name, terrstr()); dError("node:%s, failed to create cthread since %s", proc->name, terrstr());

45
source/dnode/mgmt/node_mgmt/src/dmTransport.c
View File

@ -66,32 +66,31 @@ static void dmProcessRpcMsg(SDnode *pDnode, SRpcMsg *pRpc, SEpSet *pEpSet) {
if (pRpc->msgType == TDMT_DND_NET_TEST) { if (pRpc->msgType == TDMT_DND_NET_TEST) {
dmProcessNetTestReq(pDnode, pRpc); dmProcessNetTestReq(pDnode, pRpc);
return; goto _OVER_JUST_FREE;
} else if (pRpc->msgType == TDMT_MND_SYSTABLE_RETRIEVE_RSP || pRpc->msgType == TDMT_VND_FETCH_RSP) { } else if (pRpc->msgType == TDMT_MND_SYSTABLE_RETRIEVE_RSP || pRpc->msgType == TDMT_VND_FETCH_RSP) {
code = qWorkerProcessFetchRsp(NULL, NULL, pRpc); qWorkerProcessFetchRsp(NULL, NULL, pRpc);
pRpc->pCont = NULL; // will be freed in qworker goto _OVER_JUST_FREE;
return;
} else { } else {
} }
if (pDnode->status != DND_STAT_RUNNING) { if (pDnode->status != DND_STAT_RUNNING) {
if (pRpc->msgType == TDMT_DND_SERVER_STATUS) { if (pRpc->msgType == TDMT_DND_SERVER_STATUS) {
dmProcessServerStartupStatus(pDnode, pRpc); dmProcessServerStartupStatus(pDnode, pRpc);
goto _OVER_JUST_FREE;
} else { } else {
SRpcMsg rspMsg = {.info = pRpc->info, .code = TSDB_CODE_APP_NOT_READY}; terrno = TSDB_CODE_APP_NOT_READY;
rpcSendResponse(&rspMsg); goto _OVER_RSP_FREE;
} }
return;
} }
if (IsReq(pRpc) && pRpc->pCont == NULL) { if (IsReq(pRpc) && pRpc->pCont == NULL) {
terrno = TSDB_CODE_INVALID_MSG_LEN; terrno = TSDB_CODE_INVALID_MSG_LEN;
goto _OVER; goto _OVER_RSP_FREE;
} }
if (pHandle->defaultNtype == NODE_END) { if (pHandle->defaultNtype == NODE_END) {
terrno = TSDB_CODE_MSG_NOT_PROCESSED; terrno = TSDB_CODE_MSG_NOT_PROCESSED;
goto _OVER; goto _OVER_RSP_FREE;
} else { } else {
pWrapper = &pDnode->wrappers[pHandle->defaultNtype]; pWrapper = &pDnode->wrappers[pHandle->defaultNtype];
if (pHandle->needCheckVgId) { if (pHandle->needCheckVgId) {
@ -103,18 +102,16 @@ static void dmProcessRpcMsg(SDnode *pDnode, SRpcMsg *pRpc, SEpSet *pEpSet) {
} else if (vgId == MNODE_HANDLE) { } else if (vgId == MNODE_HANDLE) {
pWrapper = &pDnode->wrappers[MNODE]; pWrapper = &pDnode->wrappers[MNODE];
} else { } else {
terrno = TSDB_CODE_INVALID_MSG;
goto _OVER;
} }
} else { } else {
terrno = TSDB_CODE_INVALID_MSG_LEN; terrno = TSDB_CODE_INVALID_MSG_LEN;
goto _OVER; goto _OVER_RSP_FREE;
} }
} }
} }
if (dmMarkWrapper(pWrapper) != 0) { if (dmMarkWrapper(pWrapper) != 0) {
goto _OVER; goto _OVER_RSP_FREE;
} else { } else {
needRelease = true; needRelease = true;
pRpc->info.wrapper = pWrapper; pRpc->info.wrapper = pWrapper;
@ -129,7 +126,7 @@ static void dmProcessRpcMsg(SDnode *pDnode, SRpcMsg *pRpc, SEpSet *pEpSet) {
goto _OVER; goto _OVER;
} }
if (InParentProc(pWrapper->proc.ptype)) { if (InParentProc(pWrapper)) {
code = dmPutToProcCQueue(&pWrapper->proc, pMsg, sizeof(SRpcMsg), pRpc->pCont, pRpc->contLen, code = dmPutToProcCQueue(&pWrapper->proc, pMsg, sizeof(SRpcMsg), pRpc->pCont, pRpc->contLen,
(IsReq(pRpc) && (pRpc->code == 0)) ? pRpc->info.handle : NULL, pRpc->info.refId, (IsReq(pRpc) && (pRpc->code == 0)) ? pRpc->info.handle : NULL, pRpc->info.refId,
DND_FUNC_REQ); DND_FUNC_REQ);
@ -139,7 +136,7 @@ static void dmProcessRpcMsg(SDnode *pDnode, SRpcMsg *pRpc, SEpSet *pEpSet) {
_OVER: _OVER:
if (code == 0) { if (code == 0) {
if (pWrapper != NULL && InParentProc(pWrapper->proc.ptype)) { if (pWrapper != NULL && InParentProc(pWrapper)) {
dTrace("msg:%p, is freed after push to cqueue", pMsg); dTrace("msg:%p, is freed after push to cqueue", pMsg);
taosFreeQitem(pMsg); taosFreeQitem(pMsg);
rpcFreeCont(pRpc->pCont); rpcFreeCont(pRpc->pCont);
@ -166,6 +163,16 @@ _OVER:
if (needRelease) { if (needRelease) {
dmReleaseWrapper(pWrapper); dmReleaseWrapper(pWrapper);
} }
return;
_OVER_JUST_FREE:
rpcFreeCont(pRpc->pCont);
return;
_OVER_RSP_FREE:
rpcFreeCont(pRpc->pCont);
SRpcMsg simpleRsp = {.code = terrno, .info = pRpc->info};
rpcSendResponse(&simpleRsp);
} }
int32_t dmInitMsgHandle(SDnode *pDnode) { int32_t dmInitMsgHandle(SDnode *pDnode) {
@ -249,7 +256,7 @@ static inline int32_t dmSendReq(const SEpSet *pEpSet, SRpcMsg *pReq) {
static inline void dmSendRsp(const SRpcMsg *pMsg) { static inline void dmSendRsp(const SRpcMsg *pMsg) {
SMgmtWrapper *pWrapper = pMsg->info.wrapper; SMgmtWrapper *pWrapper = pMsg->info.wrapper;
if (InChildProc(pWrapper->proc.ptype)) { if (InChildProc(pWrapper)) {
dmPutToProcPQueue(&pWrapper->proc, pMsg, sizeof(SRpcMsg), pMsg->pCont, pMsg->contLen, DND_FUNC_RSP); dmPutToProcPQueue(&pWrapper->proc, pMsg, sizeof(SRpcMsg), pMsg->pCont, pMsg->contLen, DND_FUNC_RSP);
} else { } else {
if (pMsg->code == TSDB_CODE_NODE_REDIRECT) { if (pMsg->code == TSDB_CODE_NODE_REDIRECT) {
@ -262,7 +269,7 @@ static inline void dmSendRsp(const SRpcMsg *pMsg) {
static inline void dmSendRedirectRsp(const SRpcMsg *pRsp, const SEpSet *pNewEpSet) { static inline void dmSendRedirectRsp(const SRpcMsg *pRsp, const SEpSet *pNewEpSet) {
SMgmtWrapper *pWrapper = pRsp->info.wrapper; SMgmtWrapper *pWrapper = pRsp->info.wrapper;
if (InChildProc(pWrapper->proc.ptype)) { if (InChildProc(pWrapper)) {
dmPutToProcPQueue(&pWrapper->proc, pRsp, sizeof(SRpcMsg), pRsp->pCont, pRsp->contLen, DND_FUNC_RSP); dmPutToProcPQueue(&pWrapper->proc, pRsp, sizeof(SRpcMsg), pRsp->pCont, pRsp->contLen, DND_FUNC_RSP);
} else { } else {
SRpcMsg rsp = {0}; SRpcMsg rsp = {0};
@ -280,7 +287,7 @@ static inline void dmSendRedirectRsp(const SRpcMsg *pRsp, const SEpSet *pNewEpSe
static inline void dmRegisterBrokenLinkArg(SRpcMsg *pMsg) { static inline void dmRegisterBrokenLinkArg(SRpcMsg *pMsg) {
SMgmtWrapper *pWrapper = pMsg->info.wrapper; SMgmtWrapper *pWrapper = pMsg->info.wrapper;
if (InChildProc(pWrapper->proc.ptype)) { if (InChildProc(pWrapper)) {
dmPutToProcPQueue(&pWrapper->proc, pMsg, sizeof(SRpcMsg), pMsg->pCont, pMsg->contLen, DND_FUNC_REGIST); dmPutToProcPQueue(&pWrapper->proc, pMsg, sizeof(SRpcMsg), pMsg->pCont, pMsg->contLen, DND_FUNC_REGIST);
} else { } else {
rpcRegisterBrokenLinkArg(pMsg); rpcRegisterBrokenLinkArg(pMsg);
@ -289,7 +296,7 @@ static inline void dmRegisterBrokenLinkArg(SRpcMsg *pMsg) {
static inline void dmReleaseHandle(SRpcHandleInfo *pHandle, int8_t type) { static inline void dmReleaseHandle(SRpcHandleInfo *pHandle, int8_t type) {
SMgmtWrapper *pWrapper = pHandle->wrapper; SMgmtWrapper *pWrapper = pHandle->wrapper;
if (InChildProc(pWrapper->proc.ptype)) { if (InChildProc(pWrapper)) {
SRpcMsg msg = {.code = type, .info = *pHandle}; SRpcMsg msg = {.code = type, .info = *pHandle};
dmPutToProcPQueue(&pWrapper->proc, &msg, sizeof(SRpcMsg), NULL, 0, DND_FUNC_RELEASE); dmPutToProcPQueue(&pWrapper->proc, &msg, sizeof(SRpcMsg), NULL, 0, DND_FUNC_RELEASE);
} else { } else {

1
source/libs/qworker/src/qworkerMsg.c
View File

@ -495,6 +495,7 @@ int32_t qWorkerProcessFetchMsg(void *node, void *qWorkerMgmt, SRpcMsg *pMsg) {
int32_t qWorkerProcessFetchRsp(void *node, void *qWorkerMgmt, SRpcMsg *pMsg) { int32_t qWorkerProcessFetchRsp(void *node, void *qWorkerMgmt, SRpcMsg *pMsg) {
qProcessFetchRsp(NULL, pMsg, NULL); qProcessFetchRsp(NULL, pMsg, NULL);
pMsg->pCont = NULL;
return TSDB_CODE_SUCCESS; return TSDB_CODE_SUCCESS;
} }