diff --git a/src/sled/log/log.cc b/src/sled/log/log.cc
index 3bd5cd9..f2af81d 100644
--- a/src/sled/log/log.cc
+++ b/src/sled/log/log.cc
@@ -97,27 +97,6 @@ GetCurrentUTCTime()
     return result;
 }
 
-static LogLevel g_log_level = LogLevel::kTrace;
-// static std::string g_log_file_name;
-static std::ofstream g_log_stream;
-
-void
-SetLogLevel(LogLevel level)
-{
-    g_log_level = level;
-}
-
-void
-SetLogFileName(const char *file_name)
-{
-    std::ofstream tmp_stream(file_name, std::ios_base::app);
-    if (tmp_stream.is_open()) {
-        g_log_stream.open(file_name, std::ios_base::app);
-    } else {
-        LOGE("log", "can't open new log file [{}]", file_name);
-    }
-}
-
 static std::atomic<uint32_t> g_current_id(0);
 static std::atomic<uint32_t> g_request_id(0);
 
@@ -138,6 +117,31 @@ private:
     std::atomic<uint32_t> &current_id_;
 };
 
+static LogLevel g_log_level = LogLevel::kTrace;
+// static std::string g_log_file_name;
+static std::ofstream g_log_stream;
+
+void
+SetLogLevel(LogLevel level)
+{
+    g_log_level = level;
+}
+
+void
+SetLogFileName(const char *file_name)
+{
+    std::ofstream tmp_stream(file_name, std::ios_base::app);
+    if (tmp_stream.is_open()) {
+        // g_log_stream.open(file_name, std::ios_base::app);
+        // g_log_stream = std::move(tmp_stream);
+        Waiter waiter(g_request_id.fetch_add(1), g_current_id);
+        std::swap(g_log_stream, tmp_stream);
+    } else {
+        LOGE("log", "can't open new log file [{}]", file_name);
+    }
+    LOGD("log", "log to new file [{}]", file_name);
+}
+
 void
 Log(LogLevel level, const char *tag, const char *fmt, const char *file_name, int line, const char *func_name, ...)
 {