diff --git a/curvefs/src/client/s3/client_s3_cache_manager.cpp b/curvefs/src/client/s3/client_s3_cache_manager.cpp
index b5c4bb3fc3..a2a5101c53 100644
--- a/curvefs/src/client/s3/client_s3_cache_manager.cpp
+++ b/curvefs/src/client/s3/client_s3_cache_manager.cpp
@@ -989,7 +989,7 @@ CURVEFS_ERROR FileCacheManager::Flush(bool force, bool toS3) {
         };
         std::vector<std::shared_ptr<FlushChunkCacheContext>> flushTasks;
         auto iter = tmp.begin();
-        VLOG(6) << "flush size is: " << tmp.size();
+        VLOG(0) << "whs: flush size is: " << tmp.size();
         for (; iter != tmp.end(); iter++) {
             auto context = std::make_shared<FlushChunkCacheContext>();
             context->inode = inode_;
@@ -999,13 +999,12 @@ CURVEFS_ERROR FileCacheManager::Flush(bool force, bool toS3) {
             flushTasks.emplace_back(context);
         }
         pendingReq.fetch_add(flushTasks.size(), std::memory_order_seq_cst);
-        for (auto iter = flushTasks.begin();
-          iter != flushTasks.end(); ++iter) {
-            s3ClientAdaptor_->Enqueue(*iter);
-        }
-
         if (pendingReq.load(std::memory_order_seq_cst)) {
             VLOG(6) << "wait for pendingReq";
+            for (auto iter = flushTasks.begin();
+              iter != flushTasks.end(); ++iter) {
+                s3ClientAdaptor_->Enqueue(*iter);
+            }
             cond.Wait();
         }
         VLOG(6) << "file cache flush over";