HDFS-5276. Remove volatile from LightWeightHashSet. (Junping Du via llu)

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1531225 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -15,6 +15,8 @@ Trunk (Unreleased)
 
   IMPROVEMENTS
 
+    HDFS-5276. Remove volatile from LightWeightHashSet. (Junping Du via llu)
+
     HDFS-4665. Move TestNetworkTopologyWithNodeGroup to common.
     (Junping Du via llu)
 

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/util/LightWeightHashSet.java

@@ -87,7 +87,7 @@ public class LightWeightHashSet<T> implements Collection<T> {
    *
    * @see ConcurrentModificationException
    */
-  protected volatile int modification = 0;
+  protected int modification = 0;
 
   private float maxLoadFactor;
   private float minLoadFactor;