diff --git a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/buffer/AppendEOFFlagThread.java b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/buffer/AppendEOFFlagThread.java
index c384a094e14f34a021718a64e0bd2a6454d1140a..7dcb552084755d23fd6daa752fec2ac4404171fa 100644
--- a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/buffer/AppendEOFFlagThread.java
+++ b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/buffer/AppendEOFFlagThread.java
@@ -32,7 +32,7 @@ class AppendEOFFlagThread extends Thread {
                     bufferedWriter.flush();
                     bufferedWriter.close();
                 } catch (IOException e) {
-
+                    logger.error("Flush data file failed", e);
                 }
             }
         }
diff --git a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/RegisterPersistenceThread.java b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/RegisterPersistenceThread.java
index d748cc32b75ca4a170255f5d315eea6b2adcce77..9c0cd46c756db83d007240b47b4b7c5a256c1d8d 100644
--- a/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/RegisterPersistenceThread.java
+++ b/skywalking-server/src/main/java/com/ai/cloud/skywalking/reciever/persistance/RegisterPersistenceThread.java
@@ -40,7 +40,6 @@ public class RegisterPersistenceThread extends Thread {
             }
             Collection<FileRegisterEntry> fileRegisterEntries = MemoryRegister.instance().getEntries();
             logger.info("file Register Entries size [{}]", fileRegisterEntries.size());
-            BufferedWriter writer = null;
             try {
                 writer = new BufferedWriter(new FileWriter(file));
             } catch (IOException e) {
@@ -52,7 +51,7 @@ public class RegisterPersistenceThread extends Thread {
                 try {
                     writer.write(fileRegisterEntry.toString() + "\n");
                 } catch (IOException e) {
-                    e.printStackTrace();
+                    logger.error("Write file register entry to offset file failure", e);
                 }
             }
             try {
@@ -60,7 +59,7 @@ public class RegisterPersistenceThread extends Thread {
                 writer.flush();
                 writer.close();
             } catch (IOException e) {
-                e.printStackTrace();
+                logger.error("Flush offset file failure", e);
             }
 
         }