596f00ae_orter_plugin_for_MR___ASF_JIRA__Protection
[Class] org.apache.hadoop.mapreduce.task.reduce.MergeManager [Annotation] Changed from Private, Unstable to Public, Unstable [Reason] To reuse the default implementation of PreReduceProcessor. [Protection] 
No change
[MAPREDUCE-2454] Allow external sorter plugin for MR - ASF JIRA
Protection