From bb5df272b9c0be9830ee8480cd33e75d26deb9d1 Mon Sep 17 00:00:00 2001
From: Junping Du <junping_du@apache.org>
Date: Wed, 23 Dec 2015 08:55:12 -0800
Subject: [PATCH] YARN-4400. AsyncDispatcher.waitForDrained should be final.
 Contributed by Daniel Templeton.

---
 hadoop-yarn-project/CHANGES.txt                                | 3 +++
 .../java/org/apache/hadoop/yarn/event/AsyncDispatcher.java     | 2 +-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 0608aa8de2a..d3f690ec649 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -1182,6 +1182,9 @@ Release 2.8.0 - UNRELEASED
     YARN-4477. FairScheduler: Handle condition which can result in an
     infinite loop in attemptScheduling. (Tao Jie via asuresh)
 
+    YARN-4400. AsyncDispatcher.waitForDrained should be final. (Daniel Templeton 
+    via junping_du)
+
 Release 2.7.3 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/AsyncDispatcher.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/AsyncDispatcher.java
index 403381ba8b5..ee6a6379d7a 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/AsyncDispatcher.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/event/AsyncDispatcher.java
@@ -59,7 +59,7 @@ public class AsyncDispatcher extends AbstractService implements Dispatcher {
   // Indicates all the remaining dispatcher's events on stop have been drained
   // and processed.
   private volatile boolean drained = true;
-  private Object waitForDrained = new Object();
+  private final Object waitForDrained = new Object();
 
   // For drainEventsOnStop enabled only, block newly coming events into the
   // queue while stopping.