diff --git a/source/os/src/osFile.c b/source/os/src/osFile.c
index 8c2170239f95ca7c70c9c3228dfb1736f29414aa..d8cccc83ed7ce0942576873859b27b33cc4621ec 100644
--- a/source/os/src/osFile.c
+++ b/source/os/src/osFile.c
@@ -464,7 +464,9 @@ int64_t taosWriteFile(TdFilePtr pFile, const void *buf, int64_t count) {
 #if FILE_WITH_LOCK
   taosThreadRwlockWrlock(&(pFile->rwlock));
 #endif
-  assert(pFile->fd >= 0);  // Please check if you have closed the file.
+  if (pFile->fd < 0) {
+    return 0;
+  }
 
   int64_t nleft = count;
   int64_t nwritten = 0;
diff --git a/source/util/src/tlog.c b/source/util/src/tlog.c
index 747187254fad1a9bb18275d1f46795aa2a1a8f85..f6f814d82b8f1de69e28790bb6407c629446590e 100644
--- a/source/util/src/tlog.c
+++ b/source/util/src/tlog.c
@@ -445,6 +445,9 @@ static inline int32_t taosBuildLogHead(char *buffer, const char *flags) {
 static inline void taosPrintLogImp(ELogLevel level, int32_t dflag, const char *buffer, int32_t len) {
   if ((dflag & DEBUG_FILE) && tsLogObj.logHandle && tsLogObj.logHandle->pFile != NULL && osLogSpaceAvailable()) {
     taosUpdateLogNums(level);
+#if 0 
+    // DEBUG_FATAL and DEBUG_ERROR are duplicated
+    // fsync will cause thread blocking and may also generate log misalignment in case of asyncLog
     if (tsAsyncLog && level != DEBUG_FATAL) {
       taosPushLogBuffer(tsLogObj.logHandle, buffer, len);
     } else {
@@ -453,6 +456,13 @@ static inline void taosPrintLogImp(ELogLevel level, int32_t dflag, const char *b
         taosFsyncFile(tsLogObj.logHandle->pFile);
       }
     }
+#else
+    if (tsAsyncLog) {
+      taosPushLogBuffer(tsLogObj.logHandle, buffer, len);
+    } else {
+      taosWriteFile(tsLogObj.logHandle->pFile, buffer, len);
+    }
+#endif
 
     if (tsLogObj.maxLines > 0) {
       atomic_add_fetch_32(&tsLogObj.lines, 1);