[jira] [Created] (MAPREDUCE-5115) MR app master may try to assign a reduce priority container to a map

["Bikas Saha (JIRA)" <ji...@apache.org>]

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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