refactor: do some internal refactor.

include/libs/wal/wal.h

@@ -195,7 +195,7 @@ SWalReader *walOpenReader(SWal *, SWalFilterCond *pCond);
 void        walCloseReader(SWalReader *pRead);
 void        walReadReset(SWalReader *pReader);
 int32_t     walReadVer(SWalReader *pRead, int64_t ver);
-int32_t     walReadSeekVer(SWalReader *pRead, int64_t ver);
+int32_t     walReaderSeekVer(SWalReader *pRead, int64_t ver);
 int32_t     walNextValidMsg(SWalReader *pRead);
 int64_t     walReaderGetCurrentVer(const SWalReader* pReader);
 int64_t     walReaderGetValidFirstVer(const SWalReader* pReader);

source/dnode/vnode/src/tq/tqRead.c

@@ -294,7 +294,7 @@ void tqCloseReader(STqReader* pReader) {
 }
 
 int32_t tqSeekVer(STqReader* pReader, int64_t ver, const char* id) {
-  if (walReadSeekVer(pReader->pWalReader, ver) < 0) {
+  if (walReaderSeekVer(pReader->pWalReader, ver) < 0) {
     return -1;
   }
   tqDebug("wal reader seek to ver:%"PRId64" %s", ver, id);

source/dnode/vnode/src/tq/tqRestore.c

@@ -112,18 +112,25 @@ int32_t createStreamRunReq(SStreamMeta* pStreamMeta, bool* pScanIdle) {
       pTask->chkInfo.currentVer = firstVer;
       tqWarn("vgId:%d s-task:%s ver earlier than the first ver of wal range %" PRId64 ", forward to %" PRId64, vgId,
              pTask->id.idStr, firstVer, pTask->chkInfo.currentVer);
-    }
 
-    int64_t currentVer = walReaderGetCurrentVer(pTask->exec.pWalReader);
-    if (currentVer != pTask->chkInfo.currentVer) {
-      int32_t code = walReadSeekVer(pTask->exec.pWalReader, pTask->chkInfo.currentVer);
-      if (code != TSDB_CODE_SUCCESS) {  // no data in wal, quit
+      // todo need retry if failed
+      int32_t code = walReaderSeekVer(pTask->exec.pWalReader, pTask->chkInfo.currentVer);
+      if (code != TSDB_CODE_SUCCESS) {
         streamMetaReleaseTask(pStreamMeta, pTask);
         continue;
       }
-
-      // append the data for the stream
-      tqDebug("vgId:%d s-task:%s wal reader seek to ver:%" PRId64, vgId, pTask->id.idStr, pTask->chkInfo.currentVer);
+    } else {
+      int64_t currentVer = walReaderGetCurrentVer(pTask->exec.pWalReader);
+      if (currentVer != pTask->chkInfo.currentVer) {
+        int32_t code = walReaderSeekVer(pTask->exec.pWalReader, pTask->chkInfo.currentVer);
+        if (code != TSDB_CODE_SUCCESS) {  // no data in wal, quit
+          streamMetaReleaseTask(pStreamMeta, pTask);
+          continue;
+        }
+
+        // append the data for the stream
+        tqDebug("vgId:%d s-task:%s wal reader seek to ver:%" PRId64, vgId, pTask->id.idStr, pTask->chkInfo.currentVer);
+      }
     }
 
     SPackedData packData = {0};

source/libs/wal/src/walRead.c

@@ -184,6 +184,7 @@ int32_t walReadSeekVerImpl(SWalReader *pReader, int64_t ver) {
     terrno = TSDB_CODE_WAL_INVALID_VER;
     return -1;
   }
+
   if (pReader->curFileFirstVer != pRet->firstVer) {
     // error code was set inner
     if (walReadChangeFile(pReader, pRet->firstVer) < 0) {
@@ -203,7 +204,7 @@ int32_t walReadSeekVerImpl(SWalReader *pReader, int64_t ver) {
   return 0;
 }
 
-int32_t walReadSeekVer(SWalReader *pReader, int64_t ver) {
+int32_t walReaderSeekVer(SWalReader *pReader, int64_t ver) {
   SWal *pWal = pReader->pWal;
   if (ver == pReader->curVersion) {
     wDebug("vgId:%d, wal index:%" PRId64 " match, no need to reset", pReader->pWal->cfg.vgId, ver);
@@ -233,7 +234,7 @@ static int32_t walFetchHeadNew(SWalReader *pRead, int64_t fetchVer) {
   wDebug("vgId:%d, wal starts to fetch head, index:%" PRId64, pRead->pWal->cfg.vgId, fetchVer);
 
   if (pRead->curVersion != fetchVer) {
-    if (walReadSeekVer(pRead, fetchVer) < 0) {
+    if (walReaderSeekVer(pRead, fetchVer) < 0) {
       return -1;
     }
     seeked = true;
@@ -336,7 +337,7 @@ int32_t walFetchHead(SWalReader *pRead, int64_t ver, SWalCkHead *pHead) {
   }
 
   if (pRead->curVersion != ver) {
-    code = walReadSeekVer(pRead, ver);
+    code = walReaderSeekVer(pRead, ver);
     if (code < 0) {
 //      pRead->curVersion = ver;
 //      pRead->curInvalid = 1;
@@ -471,7 +472,7 @@ int32_t walReadVer(SWalReader *pReader, int64_t ver) {
   taosThreadMutexLock(&pReader->mutex);
 
   if (pReader->curVersion != ver) {
-    if (walReadSeekVer(pReader, ver) < 0) {
+    if (walReaderSeekVer(pReader, ver) < 0) {
       wError("vgId:%d, unexpected wal log, index:%" PRId64 ", since %s", pReader->pWal->cfg.vgId, ver, terrstr());
       taosThreadMutexUnlock(&pReader->mutex);
       return -1;