HDFS-3280. DFSOutputStream.sync should not be synchronized. Contributed by Todd Lipcon.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1326049 13f79535-47bb-0310-9956-ffa450edef68

hadoop-hdfs-project/hadoop-hdfs/CHANGES.txt

@@ -395,6 +395,8 @@ Release 2.0.0 - UNRELEASED
 
     HDFS-2765. TestNameEditsConfigs is incorrectly swallowing IOE. (atm)
 
+    HDFS-3280. DFSOutputStream.sync should not be synchronized (todd)
+
   BREAKDOWN OF HDFS-1623 SUBTASKS
 
     HDFS-2179. Add fencing framework and mechanisms for NameNode HA. (todd)

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java

@@ -1418,7 +1418,7 @@ class DFSOutputStream extends FSOutputSummer implements Syncable {
 
   @Override
   @Deprecated
-  public synchronized void sync() throws IOException {
+  public void sync() throws IOException {
     hflush();
   }