YARN-4158. Remove duplicate close for LogWriter in AppLogAggregatorImpl#uploadLogsForContainers. Contributed by Zhihai Xu

(cherry picked from commit 8c1cdb17a03fec91bfab172fe92b67bdeb9ebfba)

hadoop-yarn-project/CHANGES.txt

@@ -73,6 +73,9 @@ Release 2.7.2 - UNRELEASED
 
     YARN-4153. TestAsyncDispatcher failed at branch-2.7 (Zhihai Xu via jianhe)
 
+    YARN-4158. Remove duplicate close for LogWriter in
+    AppLogAggregatorImpl#uploadLogsForContainers (Zhihai Xu via jlowe)
+
 Release 2.7.1 - 2015-07-06
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/containermanager/logaggregation/AppLogAggregatorImpl.java

@@ -290,6 +290,7 @@ public class AppLogAggregatorImpl implements AppLogAggregator {
 
       if (writer != null) {
         writer.close();
+        writer = null;
       }
 
       final Path renamedPath = this.rollingMonitorInterval <= 0