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From "Joe Mudd (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MAPREDUCE-5860) Hadoop pipes Combiner is closed before all of its reduce calls
Date Wed, 25 Jun 2014 12:40:25 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-5860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Joe Mudd updated MAPREDUCE-5860:
--------------------------------

    Attachment:     (was: MAPREDUCE-5860.patch)

> Hadoop pipes Combiner is closed before all of its reduce calls
> --------------------------------------------------------------
>
>                 Key: MAPREDUCE-5860
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5860
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: pipes
>    Affects Versions: 0.23.0, trunk
>         Environment: 0.23.0 on 64 bit linux
>            Reporter: Joe Mudd
>             Fix For: trunk
>
>         Attachments: MAPREDUCE-5860.patch
>
>
> When a Combiner is specified to runTask() its reduce() method may be called after its
close() method has been called due to how the Combiner's containing object, CombineRunner,
is closed after the TaskContextImpl's reducer member is closed (see TaskContextImpl::closeAll()).
> I believe the fix is to delegate the Combiner's ownership to CombineRunner, making it
responsible for calling the Combiner's close() method and deleting the Combiner instance.



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