HADOOP-7664. Remove warmings when overriding final parameter configuration if the override value is same as the final parameter value. Contributed by Ravi Prakash.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1182645 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -38,6 +38,10 @@ Trunk (unreleased changes)
     HADOOP-7509. Improve exception message thrown when Authentication is 
     required. (Ravi Prakash via suresh)
 
+    HADOOP-7664. Remove warmings when overriding final parameter configuration
+    if the override value is same as the final parameter value.
+    (Ravi Prakash via suresh)
+
   BUGS
 
     HADOOP-7606. Upgrade Jackson to version 1.7.1 to match the version required

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

@@ -1580,7 +1580,7 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
       if (!finalParameters.contains(attr)) {
         properties.setProperty(attr, value);
         updatingResource.put(attr, name.toString());
-      } else {
+      } else if (!value.equals(properties.getProperty(attr))) {
         LOG.warn(name+":an attempt to override final parameter: "+attr
             +";  Ignoring.");
       }