liu bin created MAPREDUCE-7464:
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Summary: Make priority of mapreduce containers configurable
Key: MAPREDUCE-7464
URL: https://issues.apache.org/jira/browse/MAPREDUCE-7464
Project: Hadoop Map/Reduce
Issue Type: Improvement
Reporter: liu bin
When maps and reduces run simultaneously, if resources are insufficient,
reduces will be preempted.
Because the priority of reduce is higher than map, the preempted reduces will
first obtain resources when rerun, and then be preempted again, falling into a
loop.
We need to configure the priority of map higher than reduce to avoid this
situation.
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