309d9974_orter_plugin_for_MR___ASF_JIRA__Reason
[Class] org.apache.hadoop.mapreduce.task.reduce.ShuffleClientMetrics [Protection] Changed from package protected to public [Annotation] Annotated as Public, Unstable [Reason] 
Passed to shuffle() method in external MapOutput.
[MAPREDUCE-2454] Allow external sorter plugin for MR - ASF JIRA