refactor: do some internal refactor.

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

@@ -29,18 +29,21 @@ int tqStreamTasksScanWal(STQ* pTq) {
   while (1) {
     int32_t scan = pMeta->walScan;
     tqDebug("vgId:%d continue check if data in wal are available, scan:%d", vgId, scan);
+    ASSERT(scan >= 1);
 
     // check all restore tasks
-    bool allFull = true;
-    streamTaskReplayWal(pTq->pStreamMeta, pTq->pOffsetStore, &allFull);
+    bool shouldIdle = true;
+    streamTaskReplayWal(pTq->pStreamMeta, pTq->pOffsetStore, &shouldIdle);
 
     int32_t times = 0;
 
-    if (allFull) {
+    if (shouldIdle) {
       taosWLockLatch(&pMeta->lock);
       pMeta->walScan -= 1;
       times = pMeta->walScan;
 
+      ASSERT(pMeta->walScan >= 0);
+
       if (pMeta->walScan <= 0) {
         taosWUnLockLatch(&pMeta->lock);
         break;
@@ -49,6 +52,7 @@ int tqStreamTasksScanWal(STQ* pTq) {
       taosWUnLockLatch(&pMeta->lock);
       tqDebug("vgId:%d scan wal for stream tasks for %d times", vgId, times);
     } else {
+      tqDebug("vgId:%d no idle, scan wal for stream tasks for %d times", vgId, pMeta->walScan);
       ASSERT(pMeta->walScan >= 1);
     }
   }