HADOOP-7664. Merging change r1182645 from trunk to branch-2.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-2@1610875 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -12,6 +12,10 @@ Release 2.6.0 - UNRELEASED
 
     HADOOP-10815. Implement Windows equivalent of mlock. (cnauroth)
 
+    HADOOP-7664. Remove warmings when overriding final parameter configuration
+    if the override value is same as the final parameter value.
+    (Ravi Prakash via suresh)
+
   OPTIMIZATIONS
 
   BUG FIXES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java

@@ -2364,7 +2364,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
       if (!finalParameters.contains(attr)) {
         properties.setProperty(attr, value);
         updatingResource.put(attr, source);
-      } else {
+      } else if (!value.equals(properties.getProperty(attr))) {
         LOG.warn(name+":an attempt to override final parameter: "+attr
             +";  Ignoring.");
       }