YARN-4581. AHS writer thread leak makes RM crash while RM is recovering. Contributed by sandflee.

(cherry picked from commit fc6d3a3b234efff2b0b646c31a4e6ff0a5118ef9)

Conflicts:

	hadoop-yarn-project/CHANGES.txt
(cherry picked from commit e09222306f65227d14fe1e656102d225b232409c)

Conflicts:

	hadoop-yarn-project/CHANGES.txt

hadoop-yarn-project/CHANGES.txt

@@ -55,6 +55,9 @@ Release 2.6.4 - UNRELEASED
     YARN-4414. Nodemanager connection errors are retried at multiple levels
     (Chang Li via jlowe)
 
+    YARN-4581. AHS writer thread leak makes RM crash while RM is recovering.
+    (sandflee via junping_du)
+
 Release 2.6.3 - 2015-12-17
 
   INCOMPATIBLE CHANGES

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-applicationhistoryservice/src/main/java/org/apache/hadoop/yarn/server/applicationhistoryservice/FileSystemApplicationHistoryStore.java

@@ -734,12 +734,17 @@ public class FileSystemApplicationHistoryStore extends AbstractService
       } else {
         fsdos = fs.create(historyFile);
       }
-      fs.setPermission(historyFile, HISTORY_FILE_UMASK);
-      writer =
-          new TFile.Writer(fsdos, MIN_BLOCK_SIZE, getConfig().get(
-            YarnConfiguration.FS_APPLICATION_HISTORY_STORE_COMPRESSION_TYPE,
-            YarnConfiguration.DEFAULT_FS_APPLICATION_HISTORY_STORE_COMPRESSION_TYPE), null,
-            getConfig());
+      try {
+        fs.setPermission(historyFile, HISTORY_FILE_UMASK);
+        writer =
+            new TFile.Writer(fsdos, MIN_BLOCK_SIZE, getConfig().get(
+                YarnConfiguration.FS_APPLICATION_HISTORY_STORE_COMPRESSION_TYPE,
+                YarnConfiguration.DEFAULT_FS_APPLICATION_HISTORY_STORE_COMPRESSION_TYPE), null,
+                getConfig());
+      } catch (IOException e) {
+        IOUtils.cleanup(LOG, fsdos);
+        throw e;
+      }
     }
 
     public synchronized void close() {