From a4ba6c85255dbb1d7dae4072db581c043e494dec Mon Sep 17 00:00:00 2001
From: Wangda Tan <wangda@apache.org>
Date: Tue, 8 Dec 2015 14:25:16 -0800
Subject: [PATCH] YARN-4424. Fix deadlock in RMAppImpl. (Jian he via wangda)

(cherry picked from commit 7e4715186d31ac889fba26d453feedcebb11fc70)

Conflicts:
	hadoop-yarn-project/CHANGES.txt

(cherry picked from commit 7013f9d6cda88e72a839b1c55757615b55101beb)

Conflicts:
	hadoop-yarn-project/CHANGES.txt
---
 hadoop-yarn-project/CHANGES.txt               |  2 ++
 .../resourcemanager/rmapp/RMAppImpl.java      | 22 +++++++------------
 2 files changed, 10 insertions(+), 14 deletions(-)

diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 1764fc34dac..412999f4d0f 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -2000,6 +2000,8 @@ Release 2.6.3 - UNRELEASED
     YARN-4434. NodeManager Disk Checker parameter documentation is not correct.
     (Weiwei Yang via aajisaka)
 
+    YARN-4424. Fix deadlock in RMAppImpl. (Jian he via wangda)
+
 Release 2.6.2 - 2015-10-28
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java
index b1a5814081b..7a2b717cc73 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-resourcemanager/src/main/java/org/apache/hadoop/yarn/server/resourcemanager/rmapp/RMAppImpl.java
@@ -490,21 +490,15 @@ public class RMAppImpl implements RMApp, Recoverable {
 
   @Override
   public FinalApplicationStatus getFinalApplicationStatus() {
-    this.readLock.lock();
-    try {
-      // finish state is obtained based on the state machine's current state 
-      // as a fall-back in case the application has not been unregistered 
-      // ( or if the app never unregistered itself )
-      // when the report is requested
-      if (currentAttempt != null 
-          && currentAttempt.getFinalApplicationStatus() != null) {
-        return currentAttempt.getFinalApplicationStatus();   
-      }
-      return 
-          createFinalApplicationStatus(this.stateMachine.getCurrentState());
-    } finally {
-      this.readLock.unlock();
+    // finish state is obtained based on the state machine's current state
+    // as a fall-back in case the application has not been unregistered
+    // ( or if the app never unregistered itself )
+    // when the report is requested
+    if (currentAttempt != null
+        && currentAttempt.getFinalApplicationStatus() != null) {
+      return currentAttempt.getFinalApplicationStatus();
     }
+    return createFinalApplicationStatus(this.stateMachine.getCurrentState());
   }
 
   @Override