65e290e7_orter_plugin_for_MR___ASF_JIRA__Reason
[Class] org.apache.hadoop.mapreduce.task.reduce.MergeManager [Protection] No change [Annotation] Changed from Private, Unstable to Public, Unstable [Reason] 
To reuse the default implementation of PreReduceProcessor.
[MAPREDUCE-2454] Allow external sorter plugin for MR - ASF JIRA