Bikas Saha created MAPREDUCE-5115:
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Summary: MR app master may try to assign a reduce priority
container to a map
Key: MAPREDUCE-5115
URL: https://issues.apache.org/jira/browse/MAPREDUCE-5115
Project: Hadoop Map/Reduce
Issue Type: Bug
Reporter: Bikas Saha
ScheduledRequests.assign() checks reduces.isEmpty() and releases REDUCE
priority containers. But it could have received more REDUCE priority containers
than reduces.size() in which case it will not release excess REDUCE priority
containers. Later on in ScheduledRequests.assignToReduce() it will not be able
to assign them to reduces. These containers will fall through to
ScheduledRequests.assignMapsWithLocality() where they will get assigned to maps
or crash depending on the behavior of Java assert.
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