MAPREDUCE-6528. Memory leak for HistoryFileManager.getJobSummary(). Contributed by Junping Du

(cherry picked from commit 6344b6a7694c70f296392b6462dba452ff762109)

Conflicts:

	hadoop-mapreduce-project/CHANGES.txt

hadoop-mapreduce-project/CHANGES.txt

@@ -16,6 +16,9 @@ Release 2.6.3 - UNRELEASED
     avoid FileNotFoundException causing HistoryFileInfo into MOVE_FAILED state.
     (zhihai xu via devaraj)
 
+    MAPREDUCE-6528. Memory leak for HistoryFileManager.getJobSummary()
+    (Junping Du via jlowe)
+
 Release 2.6.2 - 2015-10-21
 
   INCOMPATIBLE CHANGES

hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-hs/src/main/java/org/apache/hadoop/mapreduce/v2/hs/HistoryFileManager.java

@@ -953,9 +953,16 @@ public class HistoryFileManager extends AbstractService {
 
   private String getJobSummary(FileContext fc, Path path) throws IOException {
     Path qPath = fc.makeQualified(path);
-    FSDataInputStream in = fc.open(qPath);
-    String jobSummaryString = in.readUTF();
-    in.close();
+    FSDataInputStream in = null;
+    String jobSummaryString = null;
+    try {
+      in = fc.open(qPath);
+      jobSummaryString = in.readUTF();
+    } finally {
+      if (in != null) {
+        in.close();
+      }
+    }
     return jobSummaryString;
   }