MR AM should reuse containers for map tasks
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Key: MAPREDUCE-3902
URL: https://issues.apache.org/jira/browse/MAPREDUCE-3902
Project: Hadoop Map/Reduce
Issue Type: Improvement
Components: applicationmaster, mrv2
Reporter: Arun C Murthy
Assignee: Arun C Murthy
The MR AM is now in a great position to reuse containers across (map) tasks.
This is something similar to JVM re-use we had in 0.20.x, but in a
significantly better manner:
# Consider data-locality when re-using containers
# Consider the new shuffle - ensure that reduces fetch output of the whole
container at once (i.e. all maps)
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