Carlo Curino created MAPREDUCE-5269:
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             Summary: Preemption of Reducer (and Shuffle) via checkpointing
                 Key: MAPREDUCE-5269
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5269
             Project: Hadoop Map/Reduce
          Issue Type: Improvement
          Components: mrv2
            Reporter: Carlo Curino


This patch tracks the changes in the task runtime (shuffle, reducer context, 
etc.) that are required to implement checkpoint-based preemption of reducer 
tasks.

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