From 7faae0e6fe027a3886d9f4e290b6a488a2c55b3a Mon Sep 17 00:00:00 2001
From: Jonathan Eagles <jeagles@yahoo-inc.com>
Date: Fri, 17 Jul 2015 11:02:11 -0500
Subject: [PATCH] YARN-3905. Application History Server UI NPEs when accessing
 apps run after RM restart (Eric Payne via jeagles)

---
 hadoop-yarn-project/CHANGES.txt                             | 3 +++
 .../java/org/apache/hadoop/yarn/server/webapp/AppBlock.java | 6 ++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/hadoop-yarn-project/CHANGES.txt b/hadoop-yarn-project/CHANGES.txt
index 7a94e093b6..df2702375e 100644
--- a/hadoop-yarn-project/CHANGES.txt
+++ b/hadoop-yarn-project/CHANGES.txt
@@ -669,6 +669,9 @@ Release 2.7.2 - UNRELEASED
 
     YARN-3690. [JDK8] 'mvn site' fails. (Brahma Reddy Battula via aajisaka)
 
+    YARN-3905. Application History Server UI NPEs when accessing apps run after
+    RM restart (Eric Payne via jeagles)
+
 Release 2.7.1 - 2015-07-06 
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/AppBlock.java b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/AppBlock.java
index f46197ef08..eec32b29d9 100644
--- a/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/AppBlock.java
+++ b/hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-common/src/main/java/org/apache/hadoop/yarn/server/webapp/AppBlock.java
@@ -38,7 +38,6 @@ import org.apache.hadoop.yarn.api.protocolrecords.GetContainerReportRequest;
 import org.apache.hadoop.yarn.api.records.ApplicationAttemptReport;
 import org.apache.hadoop.yarn.api.records.ApplicationId;
 import org.apache.hadoop.yarn.api.records.ApplicationReport;
-import org.apache.hadoop.yarn.api.records.ContainerId;
 import org.apache.hadoop.yarn.api.records.ContainerReport;
 import org.apache.hadoop.yarn.api.records.FinalApplicationStatus;
 import org.apache.hadoop.yarn.api.records.LogAggregationStatus;
@@ -255,10 +254,9 @@ public class AppBlock extends HtmlBlock {
       AppAttemptInfo appAttempt = new AppAttemptInfo(appAttemptReport);
       ContainerReport containerReport;
       try {
-        // AM container is always the first container of the attempt
         final GetContainerReportRequest request =
-            GetContainerReportRequest.newInstance(ContainerId.newContainerId(
-              appAttemptReport.getApplicationAttemptId(), 1));
+                GetContainerReportRequest.newInstance(
+                      appAttemptReport.getAMContainerId());
         if (callerUGI == null) {
           containerReport =
               appBaseProt.getContainerReport(request).getContainerReport();