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Posted to mapreduce-issues@hadoop.apache.org by "Tom White (JIRA)" <ji...@apache.org> on 2011/03/07 22:56:59 UTC

[jira] Commented: (MAPREDUCE-2258) IFile reader closes stream and compressor in wrong order

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13003637#comment-13003637 ] 

Tom White commented on MAPREDUCE-2258:
--------------------------------------

+1

> IFile reader closes stream and compressor in wrong order
> --------------------------------------------------------
>
>                 Key: MAPREDUCE-2258
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2258
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: task
>    Affects Versions: 0.20.4, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: mapreduce-2258.txt
>
>
> In IFile.Reader.close(), we return the decompressor to the pool and then call close() on the input stream. This is backwards and causes a rare race in the case of LzopCodec, since LzopInputStream makes a few calls on the decompressor object inside close(). If another thread pulls the decompressor out of the pool and starts to use it in the meantime, the first thread's close() will cause the second thread to potentially miss pieces of data.

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