request_metadata.c: check data_version > 0 for performance

src/idempotency/server/request_metadata.c

@@ -122,7 +122,7 @@ static void *thread_run(void *arg)
                     arg, &data_version))
         {
             process_master_side(ctx);
-        } else {
+        } else if (data_version > 0) {
             process_slave_side(ctx, data_version);
         }
 

src/sf_nio.c

@@ -324,7 +324,7 @@ int sf_nio_notify(struct fast_task_info *task, const int stage)
             if (task->continue_callback != NULL) {
                 return task->continue_callback(task);
             } else {
-                logWarning("file: "__FILE__", line: %d, "
+                logDebug("file: "__FILE__", line: %d, "
                         "task %p, continue_callback is NULL",
                         __LINE__, task);
                 return 0;