fix: wal ref

include/libs/wal/wal.h

@@ -201,7 +201,7 @@ int32_t walFetchHead(SWalReader *pRead, int64_t ver, SWalCkHead *pHead);
 int32_t walFetchBody(SWalReader *pRead, SWalCkHead **ppHead);
 int32_t walSkipFetchBody(SWalReader *pRead, const SWalCkHead *pHead);
 
-SWalRef *walRefFirstVer(SWal *);
+SWalRef *walRefFirstVer(SWal *, SWalRef *);
 SWalRef *walRefCommittedVer(SWal *);
 
 SWalRef *walOpenRef(SWal *);

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

@@ -521,9 +521,12 @@ int32_t tqProcessPollReq(STQ* pTq, SRpcMsg* pMsg) {
             tqOffsetResetToData(&fetchOffsetNew, 0, 0);
           }
         } else {
-          int64_t firstVer = walGetFirstVer(pTq->pVnode->pWal);
-          walRefVer(pHandle->pRef, firstVer);
-          tqOffsetResetToLog(&fetchOffsetNew, firstVer - 1);
+          pHandle->pRef = walRefFirstVer(pTq->pVnode->pWal, pHandle->pRef);
+          if (pHandle->pRef == NULL) {
+            terrno = TSDB_CODE_OUT_OF_MEMORY;
+            return -1;
+          }
+          tqOffsetResetToLog(&fetchOffsetNew, pHandle->pRef->refVer - 1);
         }
       } else if (reqOffset.type == TMQ_OFFSET__RESET_LATEST) {
         if (pHandle->execHandle.subType == TOPIC_SUB_TYPE__COLUMN) {
@@ -721,6 +724,8 @@ int32_t tqProcessPollReq(STQ* pTq, SRpcMsg* pMsg) {
 int32_t tqProcessDeleteSubReq(STQ* pTq, int64_t version, char* msg, int32_t msgLen) {
   SMqVDeleteReq* pReq = (SMqVDeleteReq*)msg;
 
+  tqDebug("vgId:%d, delete sub: %s", pTq->pVnode->config.vgId, pReq->subKey);
+
   taosWLockLatch(&pTq->pushLock);
   int32_t code = taosHashRemove(pTq->pPushMgr, pReq->subKey, strlen(pReq->subKey));
   if (code != 0) {

source/libs/wal/src/walRef.c

@@ -77,10 +77,12 @@ void walUnrefVer(SWalRef *pRef) {
 }
 #endif
 
-SWalRef *walRefFirstVer(SWal *pWal) {
-  SWalRef *pRef = walOpenRef(pWal);
+SWalRef *walRefFirstVer(SWal *pWal, SWalRef *pRef) {
   if (pRef == NULL) {
-    return NULL;
+    pRef = walOpenRef(pWal);
+    if (pRef == NULL) {
+      return NULL;
+    }
   }
   taosThreadMutexLock(&pWal->mutex);