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From "Siddharth Seth (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (MAPREDUCE-5115) MR app master may try to assign a reduce priority container to a map
Date Thu, 28 Mar 2013 21:45:18 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5115?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Siddharth Seth resolved MAPREDUCE-5115.

    Resolution: Duplicate
> 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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