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homework-jianmu/source/dnode/vnode/src/meta/metaSnapshot.c

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/*
* Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
*
* This program is free software: you can use, redistribute, and/or modify
* it under the terms of the GNU Affero General Public License, version 3
* or later ("AGPL"), as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "meta.h"
// SMetaSnapReader ========================================
struct SMetaSnapReader {
SMeta* pMeta;
int64_t sver;
int64_t ever;
TBC* pTbc;
};
int32_t metaSnapReaderOpen(SMeta* pMeta, int64_t sver, int64_t ever, SMetaSnapReader** ppReader) {
int32_t code = 0;
int32_t c = 0;
SMetaSnapReader* pReader = NULL;
// alloc
pReader = (SMetaSnapReader*)taosMemoryCalloc(1, sizeof(*pReader));
if (pReader == NULL) {
code = TSDB_CODE_OUT_OF_MEMORY;
goto _err;
}
pReader->pMeta = pMeta;
pReader->sver = sver;
pReader->ever = ever;
// impl
code = tdbTbcOpen(pMeta->pTbDb, &pReader->pTbc, NULL);
if (code) {
taosMemoryFree(pReader);
goto _err;
}
code = tdbTbcMoveTo(pReader->pTbc, &(STbDbKey){.version = sver, .uid = INT64_MIN}, sizeof(STbDbKey), &c);
if (code) {
taosMemoryFree(pReader);
goto _err;
}
metaInfo("vgId:%d, vnode snapshot meta reader opened", TD_VID(pMeta->pVnode));
*ppReader = pReader;
return code;
_err:
metaError("vgId:%d, vnode snapshot meta reader open failed since %s", TD_VID(pMeta->pVnode), tstrerror(code));
*ppReader = NULL;
return code;
}
int32_t metaSnapReaderClose(SMetaSnapReader** ppReader) {
int32_t code = 0;
tdbTbcClose((*ppReader)->pTbc);
taosMemoryFree(*ppReader);
*ppReader = NULL;
return code;
}
int32_t metaSnapRead(SMetaSnapReader* pReader, uint8_t** ppData) {
int32_t code = 0;
const void* pKey = NULL;
const void* pData = NULL;
int32_t nKey = 0;
int32_t nData = 0;
STbDbKey key;
*ppData = NULL;
for (;;) {
if (tdbTbcGet(pReader->pTbc, &pKey, &nKey, &pData, &nData)) {
goto _exit;
}
key = ((STbDbKey*)pKey)[0];
if (key.version > pReader->ever) {
goto _exit;
}
if (key.version < pReader->sver) {
tdbTbcMoveToNext(pReader->pTbc);
continue;
}
if (!pData || !nData) {
metaError("meta/snap: invalide nData: %" PRId32 " meta snap read failed.", nData);
goto _exit;
}
*ppData = taosMemoryMalloc(sizeof(SSnapDataHdr) + nData);
if (*ppData == NULL) {
code = TSDB_CODE_OUT_OF_MEMORY;
goto _err;
}
SSnapDataHdr* pHdr = (SSnapDataHdr*)(*ppData);
pHdr->type = SNAP_DATA_META;
pHdr->size = nData;
memcpy(pHdr->data, pData, nData);
metaDebug("vgId:%d, vnode snapshot meta read data, version:%" PRId64 " uid:%" PRId64 " blockLen:%d",
TD_VID(pReader->pMeta->pVnode), key.version, key.uid, nData);
tdbTbcMoveToNext(pReader->pTbc);
break;
}
_exit:
return code;
_err:
metaError("vgId:%d, vnode snapshot meta read data failed since %s", TD_VID(pReader->pMeta->pVnode), tstrerror(code));
return code;
}
// SMetaSnapWriter ========================================
struct SMetaSnapWriter {
SMeta* pMeta;
int64_t sver;
int64_t ever;
};
int32_t metaSnapWriterOpen(SMeta* pMeta, int64_t sver, int64_t ever, SMetaSnapWriter** ppWriter) {
int32_t code = 0;
SMetaSnapWriter* pWriter;
// alloc
pWriter = (SMetaSnapWriter*)taosMemoryCalloc(1, sizeof(*pWriter));
if (pWriter == NULL) {
code = TSDB_CODE_OUT_OF_MEMORY;
goto _err;
}
pWriter->pMeta = pMeta;
pWriter->sver = sver;
pWriter->ever = ever;
metaBegin(pMeta, META_BEGIN_HEAP_NIL);
*ppWriter = pWriter;
return code;
_err:
metaError("vgId:%d, meta snapshot writer open failed since %s", TD_VID(pMeta->pVnode), tstrerror(code));
*ppWriter = NULL;
return code;
}
int32_t metaSnapWriterClose(SMetaSnapWriter** ppWriter, int8_t rollback) {
int32_t code = 0;
SMetaSnapWriter* pWriter = *ppWriter;
if (rollback) {
metaInfo("vgId:%d, meta snapshot writer close and rollback start ", TD_VID(pWriter->pMeta->pVnode));
code = metaAbort(pWriter->pMeta);
metaInfo("vgId:%d, meta snapshot writer close and rollback finished, code:0x%x", TD_VID(pWriter->pMeta->pVnode),
code);
if (code) goto _err;
} else {
code = metaCommit(pWriter->pMeta, pWriter->pMeta->txn);
if (code) goto _err;
code = metaFinishCommit(pWriter->pMeta, pWriter->pMeta->txn);
if (code) goto _err;
}
taosMemoryFree(pWriter);
*ppWriter = NULL;
return code;
_err:
metaError("vgId:%d, meta snapshot writer close failed since %s", TD_VID(pWriter->pMeta->pVnode), tstrerror(code));
return code;
}
int32_t metaSnapWrite(SMetaSnapWriter* pWriter, uint8_t* pData, uint32_t nData) {
int32_t code = 0;
int32_t line = 0;
SMeta* pMeta = pWriter->pMeta;
SMetaEntry metaEntry = {0};
SDecoder* pDecoder = &(SDecoder){0};
tDecoderInit(pDecoder, pData + sizeof(SSnapDataHdr), nData - sizeof(SSnapDataHdr));
code = metaDecodeEntry(pDecoder, &metaEntry);
VND_CHECK_CODE(code, line, _err);
code = metaHandleEntry(pMeta, &metaEntry);
VND_CHECK_CODE(code, line, _err);
tDecoderClear(pDecoder);
return code;
_err:
tDecoderClear(pDecoder);
metaError("vgId:%d, vnode snapshot meta write failed since %s at line:%d", TD_VID(pMeta->pVnode), terrstr(), line);
return code;
}
typedef struct STableInfoForChildTable {
char* tableName;
SSchemaWrapper* schemaRow;
SSchemaWrapper* tagRow;
} STableInfoForChildTable;
static void destroySTableInfoForChildTable(void* data) {
STableInfoForChildTable* pData = (STableInfoForChildTable*)data;
taosMemoryFree(pData->tableName);
tDeleteSchemaWrapper(pData->schemaRow);
tDeleteSchemaWrapper(pData->tagRow);
}
static void MoveToSnapShotVersion(SSnapContext* ctx) {
tdbTbcClose((TBC*)ctx->pCur);
tdbTbcOpen(ctx->pMeta->pTbDb, (TBC**)&ctx->pCur, NULL);
STbDbKey key = {.version = ctx->snapVersion, .uid = INT64_MAX};
int c = 0;
tdbTbcMoveTo((TBC*)ctx->pCur, &key, sizeof(key), &c);
if (c < 0) {
tdbTbcMoveToPrev((TBC*)ctx->pCur);
}
}
static int32_t MoveToPosition(SSnapContext* ctx, int64_t ver, int64_t uid) {
tdbTbcClose((TBC*)ctx->pCur);
tdbTbcOpen(ctx->pMeta->pTbDb, (TBC**)&ctx->pCur, NULL);
STbDbKey key = {.version = ver, .uid = uid};
int c = 0;
tdbTbcMoveTo((TBC*)ctx->pCur, &key, sizeof(key), &c);
return c;
}
static void MoveToFirst(SSnapContext* ctx) {
tdbTbcClose((TBC*)ctx->pCur);
tdbTbcOpen(ctx->pMeta->pTbDb, (TBC**)&ctx->pCur, NULL);
tdbTbcMoveToFirst((TBC*)ctx->pCur);
}
static void saveSuperTableInfoForChildTable(SMetaEntry* me, SHashObj* suidInfo) {
STableInfoForChildTable* data = (STableInfoForChildTable*)taosHashGet(suidInfo, &me->uid, sizeof(tb_uid_t));
if (data) {
return;
}
STableInfoForChildTable dataTmp = {0};
dataTmp.tableName = taosStrdup(me->name);
dataTmp.schemaRow = tCloneSSchemaWrapper(&me->stbEntry.schemaRow);
dataTmp.tagRow = tCloneSSchemaWrapper(&me->stbEntry.schemaTag);
taosHashPut(suidInfo, &me->uid, sizeof(tb_uid_t), &dataTmp, sizeof(STableInfoForChildTable));
}
int32_t buildSnapContext(SVnode* pVnode, int64_t snapVersion, int64_t suid, int8_t subType, int8_t withMeta,
SSnapContext** ctxRet) {
SSnapContext* ctx = taosMemoryCalloc(1, sizeof(SSnapContext));
if (ctx == NULL) return -1;
*ctxRet = ctx;
ctx->pMeta = pVnode->pMeta;
ctx->snapVersion = snapVersion;
ctx->suid = suid;
ctx->subType = subType;
ctx->queryMeta = withMeta;
ctx->withMeta = withMeta;
ctx->idVersion = taosHashInit(100, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), true, HASH_NO_LOCK);
if (ctx->idVersion == NULL) {
return -1;
}
ctx->suidInfo = taosHashInit(100, taosGetDefaultHashFunction(TSDB_DATA_TYPE_BIGINT), true, HASH_NO_LOCK);
if (ctx->suidInfo == NULL) {
return -1;
}
taosHashSetFreeFp(ctx->suidInfo, destroySTableInfoForChildTable);
ctx->index = 0;
ctx->idList = taosArrayInit(100, sizeof(int64_t));
void* pKey = NULL;
void* pVal = NULL;
int vLen = 0, kLen = 0;
metaDebug("tmqsnap init snapVersion:%" PRIi64, ctx->snapVersion);
MoveToFirst(ctx);
while (1) {
int32_t ret = tdbTbcNext((TBC*)ctx->pCur, &pKey, &kLen, &pVal, &vLen);
if (ret < 0) break;
STbDbKey* tmp = (STbDbKey*)pKey;
if (tmp->version > ctx->snapVersion) break;
SIdInfo* idData = (SIdInfo*)taosHashGet(ctx->idVersion, &tmp->uid, sizeof(tb_uid_t));
if (idData) {
continue;
}
if (tdbTbGet(ctx->pMeta->pUidIdx, &tmp->uid, sizeof(tb_uid_t), NULL, NULL) <
0) { // check if table exist for now, need optimize later
continue;
}
SDecoder dc = {0};
SMetaEntry me = {0};
tDecoderInit(&dc, pVal, vLen);
metaDecodeEntry(&dc, &me);
if (ctx->subType == TOPIC_SUB_TYPE__TABLE) {
if ((me.uid != ctx->suid && me.type == TSDB_SUPER_TABLE) ||
(me.ctbEntry.suid != ctx->suid && me.type == TSDB_CHILD_TABLE)) {
tDecoderClear(&dc);
continue;
}
}
taosArrayPush(ctx->idList, &tmp->uid);
metaDebug("tmqsnap init idlist name:%s, uid:%" PRIi64, me.name, tmp->uid);
SIdInfo info = {0};
taosHashPut(ctx->idVersion, &tmp->uid, sizeof(tb_uid_t), &info, sizeof(SIdInfo));
tDecoderClear(&dc);
}
taosHashClear(ctx->idVersion);
MoveToSnapShotVersion(ctx);
while (1) {
int32_t ret = tdbTbcPrev((TBC*)ctx->pCur, &pKey, &kLen, &pVal, &vLen);
if (ret < 0) break;
STbDbKey* tmp = (STbDbKey*)pKey;
SIdInfo* idData = (SIdInfo*)taosHashGet(ctx->idVersion, &tmp->uid, sizeof(tb_uid_t));
if (idData) {
continue;
}
SIdInfo info = {.version = tmp->version, .index = 0};
taosHashPut(ctx->idVersion, &tmp->uid, sizeof(tb_uid_t), &info, sizeof(SIdInfo));
SDecoder dc = {0};
SMetaEntry me = {0};
tDecoderInit(&dc, pVal, vLen);
metaDecodeEntry(&dc, &me);
if (ctx->subType == TOPIC_SUB_TYPE__TABLE) {
if ((me.uid != ctx->suid && me.type == TSDB_SUPER_TABLE) ||
(me.ctbEntry.suid != ctx->suid && me.type == TSDB_CHILD_TABLE)) {
tDecoderClear(&dc);
continue;
}
}
if ((ctx->subType == TOPIC_SUB_TYPE__DB && me.type == TSDB_SUPER_TABLE) ||
(ctx->subType == TOPIC_SUB_TYPE__TABLE && me.uid == ctx->suid)) {
saveSuperTableInfoForChildTable(&me, ctx->suidInfo);
}
tDecoderClear(&dc);
}
for (int i = 0; i < taosArrayGetSize(ctx->idList); i++) {
int64_t* uid = taosArrayGet(ctx->idList, i);
SIdInfo* idData = (SIdInfo*)taosHashGet(ctx->idVersion, uid, sizeof(int64_t));
if (!idData) {
metaError("meta/snap: null idData");
return TSDB_CODE_FAILED;
}
idData->index = i;
metaDebug("tmqsnap init idVersion uid:%" PRIi64 " version:%" PRIi64 " index:%d", *uid, idData->version,
idData->index);
}
tdbFree(pKey);
tdbFree(pVal);
return TDB_CODE_SUCCESS;
}
int32_t destroySnapContext(SSnapContext* ctx) {
tdbTbcClose((TBC*)ctx->pCur);
taosArrayDestroy(ctx->idList);
taosHashCleanup(ctx->idVersion);
taosHashCleanup(ctx->suidInfo);
taosMemoryFree(ctx);
return 0;
}
static int32_t buildNormalChildTableInfo(SVCreateTbReq* req, void** pBuf, int32_t* contLen) {
int32_t ret = 0;
SVCreateTbBatchReq reqs = {0};
reqs.pArray = taosArrayInit(1, sizeof(struct SVCreateTbReq));
if (NULL == reqs.pArray) {
ret = -1;
goto end;
}
taosArrayPush(reqs.pArray, req);
reqs.nReqs = 1;
tEncodeSize(tEncodeSVCreateTbBatchReq, &reqs, *contLen, ret);
if (ret < 0) {
ret = -1;
goto end;
}
*contLen += sizeof(SMsgHead);
*pBuf = taosMemoryMalloc(*contLen);
if (NULL == *pBuf) {
ret = -1;
goto end;
}
SEncoder coder = {0};
tEncoderInit(&coder, POINTER_SHIFT(*pBuf, sizeof(SMsgHead)), *contLen);
if (tEncodeSVCreateTbBatchReq(&coder, &reqs) < 0) {
taosMemoryFreeClear(*pBuf);
tEncoderClear(&coder);
ret = -1;
goto end;
}
tEncoderClear(&coder);
end:
taosArrayDestroy(reqs.pArray);
return ret;
}
static int32_t buildSuperTableInfo(SVCreateStbReq* req, void** pBuf, int32_t* contLen) {
int32_t ret = 0;
tEncodeSize(tEncodeSVCreateStbReq, req, *contLen, ret);
if (ret < 0) {
return -1;
}
*contLen += sizeof(SMsgHead);
*pBuf = taosMemoryMalloc(*contLen);
if (NULL == *pBuf) {
return -1;
}
SEncoder encoder = {0};
tEncoderInit(&encoder, POINTER_SHIFT(*pBuf, sizeof(SMsgHead)), *contLen);
if (tEncodeSVCreateStbReq(&encoder, req) < 0) {
taosMemoryFreeClear(*pBuf);
tEncoderClear(&encoder);
return -1;
}
tEncoderClear(&encoder);
return 0;
}
int32_t setForSnapShot(SSnapContext* ctx, int64_t uid) {
int c = 0;
if (uid == 0) {
ctx->index = 0;
return c;
}
SIdInfo* idInfo = (SIdInfo*)taosHashGet(ctx->idVersion, &uid, sizeof(tb_uid_t));
if (!idInfo) {
return -1;
}
ctx->index = idInfo->index;
return c;
}
int32_t getTableInfoFromSnapshot(SSnapContext* ctx, void** pBuf, int32_t* contLen, int16_t* type, int64_t* uid) {
int32_t ret = 0;
void* pKey = NULL;
void* pVal = NULL;
int vLen = 0, kLen = 0;
while (1) {
if (ctx->index >= taosArrayGetSize(ctx->idList)) {
metaDebug("tmqsnap get meta end");
ctx->index = 0;
ctx->queryMeta = 0; // change to get data
return 0;
}
int64_t* uidTmp = taosArrayGet(ctx->idList, ctx->index);
ctx->index++;
SIdInfo* idInfo = (SIdInfo*)taosHashGet(ctx->idVersion, uidTmp, sizeof(tb_uid_t));
if (!idInfo) {
metaError("meta/snap: null idInfo");
return TSDB_CODE_FAILED;
}
*uid = *uidTmp;
ret = MoveToPosition(ctx, idInfo->version, *uidTmp);
if (ret == 0) {
break;
}
metaDebug("tmqsnap get meta not exist uid:%" PRIi64 " version:%" PRIi64, *uid, idInfo->version);
}
tdbTbcGet((TBC*)ctx->pCur, (const void**)&pKey, &kLen, (const void**)&pVal, &vLen);
SDecoder dc = {0};
SMetaEntry me = {0};
tDecoderInit(&dc, pVal, vLen);
metaDecodeEntry(&dc, &me);
metaDebug("tmqsnap get meta uid:%" PRIi64 " name:%s index:%d", *uid, me.name, ctx->index - 1);
if ((ctx->subType == TOPIC_SUB_TYPE__DB && me.type == TSDB_SUPER_TABLE) ||
(ctx->subType == TOPIC_SUB_TYPE__TABLE && me.uid == ctx->suid)) {
SVCreateStbReq req = {0};
req.name = me.name;
req.suid = me.uid;
req.schemaRow = me.stbEntry.schemaRow;
req.schemaTag = me.stbEntry.schemaTag;
req.schemaRow.version = 1;
req.schemaTag.version = 1;
ret = buildSuperTableInfo(&req, pBuf, contLen);
*type = TDMT_VND_CREATE_STB;
} else if ((ctx->subType == TOPIC_SUB_TYPE__DB && me.type == TSDB_CHILD_TABLE) ||
(ctx->subType == TOPIC_SUB_TYPE__TABLE && me.type == TSDB_CHILD_TABLE && me.ctbEntry.suid == ctx->suid)) {
STableInfoForChildTable* data =
(STableInfoForChildTable*)taosHashGet(ctx->suidInfo, &me.ctbEntry.suid, sizeof(tb_uid_t));
if (!data) {
metaError("meta/snap: null data");
return TSDB_CODE_FAILED;
}
SVCreateTbReq req = {0};
req.type = TSDB_CHILD_TABLE;
req.name = me.name;
req.uid = me.uid;
req.commentLen = -1;
req.ctb.suid = me.ctbEntry.suid;
req.ctb.tagNum = data->tagRow->nCols;
req.ctb.stbName = data->tableName;
SArray* tagName = taosArrayInit(req.ctb.tagNum, TSDB_COL_NAME_LEN);
STag* p = (STag*)me.ctbEntry.pTags;
if (tTagIsJson(p)) {
if (p->nTag != 0) {
SSchema* schema = &data->tagRow->pSchema[0];
taosArrayPush(tagName, schema->name);
}
} else {
SArray* pTagVals = NULL;
if (tTagToValArray((const STag*)p, &pTagVals) != 0) {
metaError("meta/snap: tag to val array failed.");
return TSDB_CODE_FAILED;
}
int16_t nCols = taosArrayGetSize(pTagVals);
for (int j = 0; j < nCols; ++j) {
STagVal* pTagVal = (STagVal*)taosArrayGet(pTagVals, j);
for (int i = 0; i < data->tagRow->nCols; i++) {
SSchema* schema = &data->tagRow->pSchema[i];
if (schema->colId == pTagVal->cid) {
taosArrayPush(tagName, schema->name);
}
}
}
taosArrayDestroy(pTagVals);
}
// SIdInfo* sidInfo = (SIdInfo*)taosHashGet(ctx->idVersion, &me.ctbEntry.suid, sizeof(tb_uid_t));
// if(sidInfo->version >= idInfo->version){
// // need parse tag
// STag* p = (STag*)me.ctbEntry.pTags;
// SArray* pTagVals = NULL;
// if (tTagToValArray((const STag*)p, &pTagVals) != 0) {
// }
//
// int16_t nCols = taosArrayGetSize(pTagVals);
// for (int j = 0; j < nCols; ++j) {
// STagVal* pTagVal = (STagVal*)taosArrayGet(pTagVals, j);
// }
// }else{
req.ctb.pTag = me.ctbEntry.pTags;
// }
req.ctb.tagName = tagName;
ret = buildNormalChildTableInfo(&req, pBuf, contLen);
*type = TDMT_VND_CREATE_TABLE;
taosArrayDestroy(tagName);
} else if (ctx->subType == TOPIC_SUB_TYPE__DB) {
SVCreateTbReq req = {0};
req.type = TSDB_NORMAL_TABLE;
req.name = me.name;
req.uid = me.uid;
req.commentLen = -1;
req.ntb.schemaRow = me.ntbEntry.schemaRow;
ret = buildNormalChildTableInfo(&req, pBuf, contLen);
*type = TDMT_VND_CREATE_TABLE;
} else {
metaError("meta/snap: invalid topic sub type: %" PRId8 " get meta from snap failed.", ctx->subType);
ret = -1;
}
tDecoderClear(&dc);
return ret;
}
SMetaTableInfo getMetaTableInfoFromSnapshot(SSnapContext* ctx) {
SMetaTableInfo result = {0};
void* pKey = NULL;
void* pVal = NULL;
int vLen, kLen;
while (1) {
if (ctx->index >= taosArrayGetSize(ctx->idList)) {
metaDebug("tmqsnap get uid info end");
return result;
}
int64_t* uidTmp = taosArrayGet(ctx->idList, ctx->index);
ctx->index++;
SIdInfo* idInfo = (SIdInfo*)taosHashGet(ctx->idVersion, uidTmp, sizeof(tb_uid_t));
if (!idInfo) {
metaError("meta/snap: null idInfo");
return result;
}
int32_t ret = MoveToPosition(ctx, idInfo->version, *uidTmp);
if (ret != 0) {
metaDebug("tmqsnap getMetaTableInfoFromSnapshot not exist uid:%" PRIi64 " version:%" PRIi64, *uidTmp,
idInfo->version);
continue;
}
tdbTbcGet((TBC*)ctx->pCur, (const void**)&pKey, &kLen, (const void**)&pVal, &vLen);
SDecoder dc = {0};
SMetaEntry me = {0};
tDecoderInit(&dc, pVal, vLen);
metaDecodeEntry(&dc, &me);
metaDebug("tmqsnap get uid info uid:%" PRIi64 " name:%s index:%d", me.uid, me.name, ctx->index - 1);
if (ctx->subType == TOPIC_SUB_TYPE__DB && me.type == TSDB_CHILD_TABLE) {
STableInfoForChildTable* data =
(STableInfoForChildTable*)taosHashGet(ctx->suidInfo, &me.ctbEntry.suid, sizeof(tb_uid_t));
result.uid = me.uid;
result.suid = me.ctbEntry.suid;
result.schema = tCloneSSchemaWrapper(data->schemaRow);
strcpy(result.tbName, me.name);
tDecoderClear(&dc);
break;
} else if (ctx->subType == TOPIC_SUB_TYPE__DB && me.type == TSDB_NORMAL_TABLE) {
result.uid = me.uid;
result.suid = 0;
strcpy(result.tbName, me.name);
result.schema = tCloneSSchemaWrapper(&me.ntbEntry.schemaRow);
tDecoderClear(&dc);
break;
} else if (ctx->subType == TOPIC_SUB_TYPE__TABLE && me.type == TSDB_CHILD_TABLE && me.ctbEntry.suid == ctx->suid) {
STableInfoForChildTable* data =
(STableInfoForChildTable*)taosHashGet(ctx->suidInfo, &me.ctbEntry.suid, sizeof(tb_uid_t));
result.uid = me.uid;
result.suid = me.ctbEntry.suid;
strcpy(result.tbName, me.name);
result.schema = tCloneSSchemaWrapper(data->schemaRow);
tDecoderClear(&dc);
break;
} else {
metaDebug("tmqsnap get uid continue");
tDecoderClear(&dc);
continue;
}
}
return result;
}
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