From eac1d1894354e90d314087af8e7fb168ddef9a3d Mon Sep 17 00:00:00 2001
From: Jason Lowe <jlowe@apache.org>
Date: Wed, 1 Jul 2015 18:01:22 +0000
Subject: [PATCH] MAPREDUCE-6418. MRApp should not shutdown LogManager during
 shutdown. Contributed by Chang Li

---
 hadoop-mapreduce-project/CHANGES.txt              |  3 +++
 .../hadoop/mapreduce/v2/app/MRAppMaster.java      | 14 +++++++++++---
 .../org/apache/hadoop/mapreduce/v2/app/MRApp.java | 15 +++++++++++++++
 3 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/hadoop-mapreduce-project/CHANGES.txt b/hadoop-mapreduce-project/CHANGES.txt
index dd9da7e812..2f806154ac 100644
--- a/hadoop-mapreduce-project/CHANGES.txt
+++ b/hadoop-mapreduce-project/CHANGES.txt
@@ -527,6 +527,9 @@ Release 2.8.0 - UNRELEASED
     MAPREDUCE-6420. Interrupted Exception in LocalContainerLauncher should be
     logged in warn/info level (Chang Li via jlowe)
 
+    MAPREDUCE-6418. MRApp should not shutdown LogManager during shutdown
+    (Chang Li via jlowe)
+
 Release 2.7.2 - UNRELEASED
 
   INCOMPATIBLE CHANGES
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java
index 0d3519b1c6..f199ecbbfe 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/main/java/org/apache/hadoop/mapreduce/v2/app/MRAppMaster.java
@@ -1197,11 +1197,15 @@ protected void serviceStart() throws Exception {
       startJobs();
     }
   }
-  
+
+  protected void shutdownTaskLog() {
+    TaskLog.syncLogsShutdown(logSyncer);
+  }
+
   @Override
   public void stop() {
     super.stop();
-    TaskLog.syncLogsShutdown(logSyncer);
+    shutdownTaskLog();
   }
 
   private boolean isRecoverySupported() throws IOException {
@@ -1705,10 +1709,14 @@ private static interface ExceptionAction<T> {
     T call(Configuration conf) throws Exception;
   }
 
+  protected void shutdownLogManager() {
+    LogManager.shutdown();
+  }
+
   @Override
   protected void serviceStop() throws Exception {
     super.serviceStop();
-    LogManager.shutdown();
+    shutdownLogManager();
   }
 
   public ClientService getClientService() {
diff --git a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java
index 4fe4c44206..b51adf2889 100644
--- a/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java
+++ b/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-app/src/test/java/org/apache/hadoop/mapreduce/v2/app/MRApp.java
@@ -804,5 +804,20 @@ public static ContainerTokenIdentifier newContainerTokenIdentifier(
             new Text(containerToken.getService()));
     return token.decodeIdentifier();
   }
+
+  @Override
+  protected void shutdownTaskLog() {
+    // Avoid closing the logging system during unit tests,
+    // otherwise subsequent MRApp instances in the same test
+    // will fail to log anything.
+  }
+
+  @Override
+  protected void shutdownLogManager() {
+    // Avoid closing the logging system during unit tests,
+    // otherwise subsequent MRApp instances in the same test
+    // will fail to log anything.
+  }
+
 }