Add reduce ID to shuffle clienttrace
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Key: HADOOP-6013
URL: https://issues.apache.org/jira/browse/HADOOP-6013
Project: Hadoop Core
Issue Type: Improvement
Components: mapred
Affects Versions: 0.20.0
Reporter: Jiaqi Tan
Fix For: 0.21.0
Current clienttrace messages from shuffles note only the destination map ID but
not the source reduce ID. Having both source and destination ID of each shuffle
enables full tracing of execution.
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