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Merge pull request #12339 from taosdata/feature/tq 

enh(tmq): only read committed log
This commit is contained in:
Liu Jicong 2022-05-11 15:18:59 +08:00 committed by GitHub
parent f21348a393 714dd4f497
commit 4a7910973e
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
8 changed files with 172 additions and 200 deletions
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355
include/common/tmsg.h
View File

@ -291,6 +291,109 @@ typedef struct {
SSchema* pSchema;
} SSchemaWrapper;
static FORCE_INLINE SSchemaWrapper* tCloneSSchemaWrapper(const SSchemaWrapper* pSchemaWrapper) {
SSchemaWrapper* pSW = (SSchemaWrapper*)taosMemoryMalloc(sizeof(SSchemaWrapper));
if (pSW == NULL) return pSW;
pSW->nCols = pSchemaWrapper->nCols;
pSW->sver = pSchemaWrapper->sver;
pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
if (pSW->pSchema == NULL) {
taosMemoryFree(pSW);
return NULL;
}
memcpy(pSW->pSchema, pSchemaWrapper->pSchema, pSW->nCols * sizeof(SSchema));
return pSW;
}
static FORCE_INLINE void tDeleteSSchemaWrapper(SSchemaWrapper* pSchemaWrapper) {
taosMemoryFree(pSchemaWrapper->pSchema);
taosMemoryFree(pSchemaWrapper);
}
static FORCE_INLINE int32_t taosEncodeSSchema(void** buf, const SSchema* pSchema) {
int32_t tlen = 0;
tlen += taosEncodeFixedI8(buf, pSchema->type);
tlen += taosEncodeFixedI8(buf, pSchema->flags);
tlen += taosEncodeFixedI32(buf, pSchema->bytes);
tlen += taosEncodeFixedI16(buf, pSchema->colId);
tlen += taosEncodeString(buf, pSchema->name);
return tlen;
}
static FORCE_INLINE void* taosDecodeSSchema(const void* buf, SSchema* pSchema) {
buf = taosDecodeFixedI8(buf, &pSchema->type);
buf = taosDecodeFixedI8(buf, &pSchema->flags);
buf = taosDecodeFixedI32(buf, &pSchema->bytes);
buf = taosDecodeFixedI16(buf, &pSchema->colId);
buf = taosDecodeStringTo(buf, pSchema->name);
return (void*)buf;
}
static FORCE_INLINE int32_t tEncodeSSchema(SEncoder* pEncoder, const SSchema* pSchema) {
if (tEncodeI8(pEncoder, pSchema->type) < 0) return -1;
if (tEncodeI8(pEncoder, pSchema->flags) < 0) return -1;
if (tEncodeI32v(pEncoder, pSchema->bytes) < 0) return -1;
if (tEncodeI16v(pEncoder, pSchema->colId) < 0) return -1;
if (tEncodeCStr(pEncoder, pSchema->name) < 0) return -1;
return 0;
}
static FORCE_INLINE int32_t tDecodeSSchema(SDecoder* pDecoder, SSchema* pSchema) {
if (tDecodeI8(pDecoder, &pSchema->type) < 0) return -1;
if (tDecodeI8(pDecoder, &pSchema->flags) < 0) return -1;
if (tDecodeI32v(pDecoder, &pSchema->bytes) < 0) return -1;
if (tDecodeI16v(pDecoder, &pSchema->colId) < 0) return -1;
if (tDecodeCStrTo(pDecoder, pSchema->name) < 0) return -1;
return 0;
}
static FORCE_INLINE int32_t taosEncodeSSchemaWrapper(void** buf, const SSchemaWrapper* pSW) {
int32_t tlen = 0;
tlen += taosEncodeVariantI32(buf, pSW->nCols);
tlen += taosEncodeVariantI32(buf, pSW->sver);
for (int32_t i = 0; i < pSW->nCols; i++) {
tlen += taosEncodeSSchema(buf, &pSW->pSchema[i]);
}
return tlen;
}
static FORCE_INLINE void* taosDecodeSSchemaWrapper(const void* buf, SSchemaWrapper* pSW) {
buf = taosDecodeVariantI32(buf, &pSW->nCols);
buf = taosDecodeVariantI32(buf, &pSW->sver);
pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
if (pSW->pSchema == NULL) {
return NULL;
}
for (int32_t i = 0; i < pSW->nCols; i++) {
buf = taosDecodeSSchema(buf, &pSW->pSchema[i]);
}
return (void*)buf;
}
static FORCE_INLINE int32_t tEncodeSSchemaWrapper(SEncoder* pEncoder, const SSchemaWrapper* pSW) {
if (tEncodeI32v(pEncoder, pSW->nCols) < 0) return -1;
if (tEncodeI32v(pEncoder, pSW->sver) < 0) return -1;
for (int32_t i = 0; i < pSW->nCols; i++) {
if (tEncodeSSchema(pEncoder, &pSW->pSchema[i]) < 0) return -1;
}
return 0;
}
static FORCE_INLINE int32_t tDecodeSSchemaWrapper(SDecoder* pDecoder, SSchemaWrapper* pSW) {
if (tDecodeI32v(pDecoder, &pSW->nCols) < 0) return -1;
if (tDecodeI32v(pDecoder, &pSW->sver) < 0) return -1;
pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
if (pSW->pSchema == NULL) return -1;
for (int32_t i = 0; i < pSW->nCols; i++) {
if (tDecodeSSchema(pDecoder, &pSW->pSchema[i]) < 0) return -1;
}
return 0;
}
STSchema* tdGetSTSChemaFromSSChema(SSchema** pSchema, int32_t nCols);
typedef struct {
@ -1873,7 +1976,7 @@ typedef struct SMqHbTopicInfo {
int32_t epoch;
int64_t topicUid;
char name[TSDB_TOPIC_FNAME_LEN];
SArray* pVgInfo;
SArray* pVgInfo; // SArray<SMqHbVgInfo>
} SMqHbTopicInfo;
static FORCE_INLINE int32_t taosEncodeSMqHbTopicInfoMsg(void** buf, const SMqHbTopicInfo* pTopicInfo) {
@ -1992,49 +2095,6 @@ static FORCE_INLINE void* tDecodeSMqRebVgReq(const void* buf, SMqRebVgReq* pReq)
return (void*)buf;
}
typedef struct {
int8_t reserved;
} SMqRebVgRsp;
typedef struct {
int64_t leftForVer;
int32_t vgId;
int32_t epoch;
int64_t consumerId;
char topicName[TSDB_TOPIC_FNAME_LEN];
char cgroup[TSDB_CGROUP_LEN];
char* sql;
char* physicalPlan;
char* qmsg;
} SMqSetCVgReq;
static FORCE_INLINE int32_t tEncodeSMqSetCVgReq(void** buf, const SMqSetCVgReq* pReq) {
int32_t tlen = 0;
tlen += taosEncodeFixedI64(buf, pReq->leftForVer);
tlen += taosEncodeFixedI32(buf, pReq->vgId);
tlen += taosEncodeFixedI32(buf, pReq->epoch);
tlen += taosEncodeFixedI64(buf, pReq->consumerId);
tlen += taosEncodeString(buf, pReq->topicName);
tlen += taosEncodeString(buf, pReq->cgroup);
tlen += taosEncodeString(buf, pReq->sql);
tlen += taosEncodeString(buf, pReq->physicalPlan);
tlen += taosEncodeString(buf, pReq->qmsg);
return tlen;
}
static FORCE_INLINE void* tDecodeSMqSetCVgReq(void* buf, SMqSetCVgReq* pReq) {
buf = taosDecodeFixedI64(buf, &pReq->leftForVer);
buf = taosDecodeFixedI32(buf, &pReq->vgId);
buf = taosDecodeFixedI32(buf, &pReq->epoch);
buf = taosDecodeFixedI64(buf, &pReq->consumerId);
buf = taosDecodeStringTo(buf, pReq->topicName);
buf = taosDecodeStringTo(buf, pReq->cgroup);
buf = taosDecodeString(buf, &pReq->sql);
buf = taosDecodeString(buf, &pReq->physicalPlan);
buf = taosDecodeString(buf, &pReq->qmsg);
return buf;
}
typedef struct {
int32_t vgId;
int64_t offset;
@ -2056,109 +2116,6 @@ int32_t tDecodeSMqOffset(SDecoder* decoder, SMqOffset* pOffset);
int32_t tEncodeSMqCMCommitOffsetReq(SEncoder* encoder, const SMqCMCommitOffsetReq* pReq);
int32_t tDecodeSMqCMCommitOffsetReq(SDecoder* decoder, SMqCMCommitOffsetReq* pReq);
static FORCE_INLINE SSchemaWrapper* tCloneSSchemaWrapper(const SSchemaWrapper* pSchemaWrapper) {
SSchemaWrapper* pSW = (SSchemaWrapper*)taosMemoryMalloc(sizeof(SSchemaWrapper));
if (pSW == NULL) return pSW;
pSW->nCols = pSchemaWrapper->nCols;
pSW->sver = pSchemaWrapper->sver;
pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
if (pSW->pSchema == NULL) {
taosMemoryFree(pSW);
return NULL;
}
memcpy(pSW->pSchema, pSchemaWrapper->pSchema, pSW->nCols * sizeof(SSchema));
return pSW;
}
static FORCE_INLINE void tDeleteSSchemaWrapper(SSchemaWrapper* pSchemaWrapper) {
taosMemoryFree(pSchemaWrapper->pSchema);
taosMemoryFree(pSchemaWrapper);
}
static FORCE_INLINE int32_t taosEncodeSSchema(void** buf, const SSchema* pSchema) {
int32_t tlen = 0;
tlen += taosEncodeFixedI8(buf, pSchema->type);
tlen += taosEncodeFixedI8(buf, pSchema->flags);
tlen += taosEncodeFixedI32(buf, pSchema->bytes);
tlen += taosEncodeFixedI16(buf, pSchema->colId);
tlen += taosEncodeString(buf, pSchema->name);
return tlen;
}
static FORCE_INLINE void* taosDecodeSSchema(const void* buf, SSchema* pSchema) {
buf = taosDecodeFixedI8(buf, &pSchema->type);
buf = taosDecodeFixedI8(buf, &pSchema->flags);
buf = taosDecodeFixedI32(buf, &pSchema->bytes);
buf = taosDecodeFixedI16(buf, &pSchema->colId);
buf = taosDecodeStringTo(buf, pSchema->name);
return (void*)buf;
}
static FORCE_INLINE int32_t tEncodeSSchema(SEncoder* pEncoder, const SSchema* pSchema) {
if (tEncodeI8(pEncoder, pSchema->type) < 0) return -1;
if (tEncodeI8(pEncoder, pSchema->flags) < 0) return -1;
if (tEncodeI32v(pEncoder, pSchema->bytes) < 0) return -1;
if (tEncodeI16v(pEncoder, pSchema->colId) < 0) return -1;
if (tEncodeCStr(pEncoder, pSchema->name) < 0) return -1;
return 0;
}
static FORCE_INLINE int32_t tDecodeSSchema(SDecoder* pDecoder, SSchema* pSchema) {
if (tDecodeI8(pDecoder, &pSchema->type) < 0) return -1;
if (tDecodeI8(pDecoder, &pSchema->flags) < 0) return -1;
if (tDecodeI32v(pDecoder, &pSchema->bytes) < 0) return -1;
if (tDecodeI16v(pDecoder, &pSchema->colId) < 0) return -1;
if (tDecodeCStrTo(pDecoder, pSchema->name) < 0) return -1;
return 0;
}
static FORCE_INLINE int32_t taosEncodeSSchemaWrapper(void** buf, const SSchemaWrapper* pSW) {
int32_t tlen = 0;
tlen += taosEncodeVariantI32(buf, pSW->nCols);
tlen += taosEncodeVariantI32(buf, pSW->sver);
for (int32_t i = 0; i < pSW->nCols; i++) {
tlen += taosEncodeSSchema(buf, &pSW->pSchema[i]);
}
return tlen;
}
static FORCE_INLINE void* taosDecodeSSchemaWrapper(const void* buf, SSchemaWrapper* pSW) {
buf = taosDecodeVariantI32(buf, &pSW->nCols);
buf = taosDecodeVariantI32(buf, &pSW->sver);
pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
if (pSW->pSchema == NULL) {
return NULL;
}
for (int32_t i = 0; i < pSW->nCols; i++) {
buf = taosDecodeSSchema(buf, &pSW->pSchema[i]);
}
return (void*)buf;
}
static FORCE_INLINE int32_t tEncodeSSchemaWrapper(SEncoder* pEncoder, const SSchemaWrapper* pSW) {
if (tEncodeI32v(pEncoder, pSW->nCols) < 0) return -1;
if (tEncodeI32v(pEncoder, pSW->sver) < 0) return -1;
for (int32_t i = 0; i < pSW->nCols; i++) {
if (tEncodeSSchema(pEncoder, &pSW->pSchema[i]) < 0) return -1;
}
return 0;
}
static FORCE_INLINE int32_t tDecodeSSchemaWrapper(SDecoder* pDecoder, SSchemaWrapper* pSW) {
if (tDecodeI32v(pDecoder, &pSW->nCols) < 0) return -1;
if (tDecodeI32v(pDecoder, &pSW->sver) < 0) return -1;
pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
if (pSW->pSchema == NULL) return -1;
for (int32_t i = 0; i < pSW->nCols; i++) {
if (tDecodeSSchema(pDecoder, &pSW->pSchema[i]) < 0) return -1;
}
return 0;
}
typedef struct {
char name[TSDB_TABLE_FNAME_LEN];
char stb[TSDB_TABLE_FNAME_LEN];
@ -2427,6 +2384,21 @@ typedef struct {
SEpSet epSet;
} SMqSubVgEp;
static FORCE_INLINE int32_t tEncodeSMqSubVgEp(void** buf, const SMqSubVgEp* pVgEp) {
int32_t tlen = 0;
tlen += taosEncodeFixedI32(buf, pVgEp->vgId);
tlen += taosEncodeFixedI64(buf, pVgEp->offset);
tlen += taosEncodeSEpSet(buf, &pVgEp->epSet);
return tlen;
}
static FORCE_INLINE void* tDecodeSMqSubVgEp(void* buf, SMqSubVgEp* pVgEp) {
buf = taosDecodeFixedI32(buf, &pVgEp->vgId);
buf = taosDecodeFixedI64(buf, &pVgEp->offset);
buf = taosDecodeSEpSet(buf, &pVgEp->epSet);
return buf;
}
typedef struct {
char topic[TSDB_TOPIC_FNAME_LEN];
int8_t isSchemaAdaptive;
@ -2434,6 +2406,43 @@ typedef struct {
SSchemaWrapper schema;
} SMqSubTopicEp;
static FORCE_INLINE int32_t tEncodeSMqSubTopicEp(void** buf, const SMqSubTopicEp* pTopicEp) {
int32_t tlen = 0;
tlen += taosEncodeString(buf, pTopicEp->topic);
tlen += taosEncodeFixedI8(buf, pTopicEp->isSchemaAdaptive);
int32_t sz = taosArrayGetSize(pTopicEp->vgs);
tlen += taosEncodeFixedI32(buf, sz);
for (int32_t i = 0; i < sz; i++) {
SMqSubVgEp* pVgEp = (SMqSubVgEp*)taosArrayGet(pTopicEp->vgs, i);
tlen += tEncodeSMqSubVgEp(buf, pVgEp);
}
tlen += taosEncodeSSchemaWrapper(buf, &pTopicEp->schema);
return tlen;
}
static FORCE_INLINE void* tDecodeSMqSubTopicEp(void* buf, SMqSubTopicEp* pTopicEp) {
buf = taosDecodeStringTo(buf, pTopicEp->topic);
buf = taosDecodeFixedI8(buf, &pTopicEp->isSchemaAdaptive);
int32_t sz;
buf = taosDecodeFixedI32(buf, &sz);
pTopicEp->vgs = taosArrayInit(sz, sizeof(SMqSubVgEp));
if (pTopicEp->vgs == NULL) {
return NULL;
}
for (int32_t i = 0; i < sz; i++) {
SMqSubVgEp vgEp;
buf = tDecodeSMqSubVgEp(buf, &vgEp);
taosArrayPush(pTopicEp->vgs, &vgEp);
}
buf = taosDecodeSSchemaWrapper(buf, &pTopicEp->schema);
return buf;
}
static FORCE_INLINE void tDeleteSMqSubTopicEp(SMqSubTopicEp* pSubTopicEp) {
// taosMemoryFree(pSubTopicEp->schema.pSchema);
taosArrayDestroy(pSubTopicEp->vgs);
}
typedef struct {
SMqRspHead head;
int64_t reqOffset;
@ -2512,58 +2521,6 @@ typedef struct {
SArray* topics; // SArray<SMqSubTopicEp>
} SMqAskEpRsp;
static FORCE_INLINE void tDeleteSMqSubTopicEp(SMqSubTopicEp* pSubTopicEp) {
// taosMemoryFree(pSubTopicEp->schema.pSchema);
taosArrayDestroy(pSubTopicEp->vgs);
}
static FORCE_INLINE int32_t tEncodeSMqSubVgEp(void** buf, const SMqSubVgEp* pVgEp) {
int32_t tlen = 0;
tlen += taosEncodeFixedI32(buf, pVgEp->vgId);
tlen += taosEncodeFixedI64(buf, pVgEp->offset);
tlen += taosEncodeSEpSet(buf, &pVgEp->epSet);
return tlen;
}
static FORCE_INLINE void* tDecodeSMqSubVgEp(void* buf, SMqSubVgEp* pVgEp) {
buf = taosDecodeFixedI32(buf, &pVgEp->vgId);
buf = taosDecodeFixedI64(buf, &pVgEp->offset);
buf = taosDecodeSEpSet(buf, &pVgEp->epSet);
return buf;
}
static FORCE_INLINE int32_t tEncodeSMqSubTopicEp(void** buf, const SMqSubTopicEp* pTopicEp) {
int32_t tlen = 0;
tlen += taosEncodeString(buf, pTopicEp->topic);
tlen += taosEncodeFixedI8(buf, pTopicEp->isSchemaAdaptive);
int32_t sz = taosArrayGetSize(pTopicEp->vgs);
tlen += taosEncodeFixedI32(buf, sz);
for (int32_t i = 0; i < sz; i++) {
SMqSubVgEp* pVgEp = (SMqSubVgEp*)taosArrayGet(pTopicEp->vgs, i);
tlen += tEncodeSMqSubVgEp(buf, pVgEp);
}
tlen += taosEncodeSSchemaWrapper(buf, &pTopicEp->schema);
return tlen;
}
static FORCE_INLINE void* tDecodeSMqSubTopicEp(void* buf, SMqSubTopicEp* pTopicEp) {
buf = taosDecodeStringTo(buf, pTopicEp->topic);
buf = taosDecodeFixedI8(buf, &pTopicEp->isSchemaAdaptive);
int32_t sz;
buf = taosDecodeFixedI32(buf, &sz);
pTopicEp->vgs = taosArrayInit(sz, sizeof(SMqSubVgEp));
if (pTopicEp->vgs == NULL) {
return NULL;
}
for (int32_t i = 0; i < sz; i++) {
SMqSubVgEp vgEp;
buf = tDecodeSMqSubVgEp(buf, &vgEp);
taosArrayPush(pTopicEp->vgs, &vgEp);
}
buf = taosDecodeSSchemaWrapper(buf, &pTopicEp->schema);
return buf;
}
static FORCE_INLINE int32_t tEncodeSMqAskEpRsp(void** buf, const SMqAskEpRsp* pRsp) {
int32_t tlen = 0;
// tlen += taosEncodeString(buf, pRsp->cgroup);

1
include/libs/wal/wal.h
View File

@ -208,6 +208,7 @@ int32_t walReadWithFp(SWal *, FWalWrite writeFp, int64_t verStart, int32_t readN
int64_t walGetFirstVer(SWal *);
int64_t walGetSnapshotVer(SWal *);
int64_t walGetLastVer(SWal *);
int64_t walGetCommittedVer(SWal *);
#ifdef __cplusplus
}

1
source/dnode/mnode/impl/inc/mndDef.h
View File

@ -452,6 +452,7 @@ typedef struct {
int8_t withSchema;
int8_t withTag;
SRWLatch lock;
int32_t consumerCnt;
int32_t sqlLen;
int32_t astLen;
char* sql;

3
source/dnode/mnode/impl/src/mndSubscribe.c
View File

@ -787,6 +787,8 @@ static int32_t mndRetrieveSubscribe(SNodeMsg *pReq, SShowObj *pShow, SSDataBlock
}
}
// do not show for cleared subscription
#if 0
int32_t sz = taosArrayGetSize(pSub->unassignedVgs);
for (int32_t i = 0; i < sz; i++) {
SMqVgEp *pVgEp = taosArrayGetP(pSub->unassignedVgs, i);
@ -829,6 +831,7 @@ static int32_t mndRetrieveSubscribe(SNodeMsg *pReq, SShowObj *pShow, SSDataBlock
numOfRows++;
}
#endif
taosRUnLockLatch(&pSub->lock);
sdbRelease(pSdb, pSub);
}

4
source/dnode/mnode/impl/src/mndTopic.c
View File

@ -89,6 +89,8 @@ SSdbRaw *mndTopicActionEncode(SMqTopicObj *pTopic) {
SDB_SET_INT8(pRaw, dataPos, pTopic->withTbName, TOPIC_ENCODE_OVER);
SDB_SET_INT8(pRaw, dataPos, pTopic->withSchema, TOPIC_ENCODE_OVER);
SDB_SET_INT8(pRaw, dataPos, pTopic->withTag, TOPIC_ENCODE_OVER);
SDB_SET_INT32(pRaw, dataPos, pTopic->consumerCnt, TOPIC_ENCODE_OVER);
SDB_SET_INT32(pRaw, dataPos, pTopic->sqlLen, TOPIC_ENCODE_OVER);
SDB_SET_BINARY(pRaw, dataPos, pTopic->sql, pTopic->sqlLen, TOPIC_ENCODE_OVER);
SDB_SET_INT32(pRaw, dataPos, pTopic->astLen, TOPIC_ENCODE_OVER);
@ -152,6 +154,8 @@ SSdbRow *mndTopicActionDecode(SSdbRaw *pRaw) {
SDB_GET_INT8(pRaw, dataPos, &pTopic->withSchema, TOPIC_DECODE_OVER);
SDB_GET_INT8(pRaw, dataPos, &pTopic->withTag, TOPIC_DECODE_OVER);
SDB_GET_INT32(pRaw, dataPos, &pTopic->consumerCnt, TOPIC_DECODE_OVER);
SDB_GET_INT32(pRaw, dataPos, &pTopic->sqlLen, TOPIC_DECODE_OVER);
pTopic->sql = taosMemoryCalloc(pTopic->sqlLen, sizeof(char));
if (pTopic->sql == NULL) {

2
source/dnode/vnode/src/tq/tq.c
View File

@ -401,7 +401,7 @@ int32_t tqProcessPollReq(STQ* pTq, SRpcMsg* pMsg, int32_t workerId) {
if (pReq->currentOffset == TMQ_CONF__RESET_OFFSET__EARLIEAST) {
fetchOffset = walGetFirstVer(pTq->pWal);
} else if (pReq->currentOffset == TMQ_CONF__RESET_OFFSET__LATEST) {
fetchOffset = walGetLastVer(pTq->pWal);
fetchOffset = walGetCommittedVer(pTq->pWal);
} else {
fetchOffset = pReq->currentOffset + 1;
}

2
source/libs/wal/src/walMeta.c
View File

@ -25,6 +25,8 @@ int64_t FORCE_INLINE walGetSnaphostVer(SWal* pWal) { return pWal->vers.snapshotV
int64_t FORCE_INLINE walGetLastVer(SWal* pWal) { return pWal->vers.lastVer; }
int64_t FORCE_INLINE walGetCommittedVer(SWal* pWal) { return pWal->vers.commitVer; }
static FORCE_INLINE int walBuildMetaName(SWal* pWal, int metaVer, char* buf) {
return sprintf(buf, "%s/meta-ver%d", pWal->path, metaVer);
}

4
source/libs/wal/src/walRead.c
View File

@ -143,7 +143,11 @@ void walSetReaderCapacity(SWalReadHandle *pRead, int32_t capacity) { pRead->capa
int32_t walFetchHead(SWalReadHandle *pRead, int64_t ver, SWalHead *pHead) {
int32_t code;
// TODO: valid ver
if (ver > pRead->pWal->vers.commitVer) {
return -1;
}
if (pRead->curVersion != ver) {
code = walReadSeekVer(pRead, ver);