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Posted to mapreduce-issues@hadoop.apache.org by "Jason Lowe (JIRA)" <ji...@apache.org> on 2013/09/04 00:33:52 UTC

[jira] [Assigned] (MAPREDUCE-5493) In-memory map outputs can be leaked after shuffle completes

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5493?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jason Lowe reassigned MAPREDUCE-5493:
-------------------------------------

    Assignee: Jason Lowe
    
> In-memory map outputs can be leaked after shuffle completes
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-5493
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5493
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv2
>    Affects Versions: 2.1.0-beta, 0.23.9
>            Reporter: Jason Lowe
>            Assignee: Jason Lowe
>            Priority: Blocker
>
> MergeManagerImpl#close adds the contents of inMemoryMergedMapOutputs and inMemoryMapOutputs to a list of map outputs that is subsequently processed, but it does not clear those sets.  This prevents some of the map outputs from being garbage collected and significantly reduces the memory available for the subsequent reduce phase.

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