diff --git a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterTaskExecThread.java b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterTaskExecThread.java
index 1ed2aaabf9..e22462c60a 100644
--- a/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterTaskExecThread.java
+++ b/dolphinscheduler-server/src/main/java/org/apache/dolphinscheduler/server/master/runner/MasterTaskExecThread.java
@@ -52,7 +52,9 @@ public class MasterTaskExecThread extends MasterBaseTaskExecThread {
      */
     private TaskInstanceCacheManager taskInstanceCacheManager;
 
-
+    /**
+     *  netty executor manager
+     */
     private NettyExecutorManager nettyExecutorManager;