HDFS-2491. TestBalancer can fail when datanode utilization and avgUtilization is exactly same. Contributed by Uma Maheswara Rao G.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.22@1187838 13f79535-47bb-0310-9956-ffa450edef68

hdfs/CHANGES.txt

@@ -653,6 +653,9 @@ Release 0.22.0 - Unreleased
     HDFS-2452. OutOfMemoryError in DataXceiverServer takes down the DataNode
     (Uma Maheswara Rao via cos)
 
+    HDFS-2491. TestBalancer can fail when datanode utilization and 
+    avgUtilization is exactly same. (Uma Maheswara Rao G via shv)
+
 Release 0.21.1 - Unreleased
 
   IMPROVEMENTS

hdfs/src/java/org/apache/hadoop/hdfs/server/balancer/Balancer.java

@@ -991,7 +991,7 @@ public class Balancer implements Tool {
       }
       cluster.add(datanode);
       BalancerDatanode datanodeS;
-      if (getUtilization(datanode) > avgUtilization) {
+      if (getUtilization(datanode) >= avgUtilization) {
         datanodeS = new Source(datanode, avgUtilization, threshold);
         if (isAboveAvgUtilized(datanodeS)) {
           this.aboveAvgUtilizedDatanodes.add((Source)datanodeS);