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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MAPREDUCE-2258) IFile reader closes stream and compressor in wrong order
Date Wed, 19 Jan 2011 01:58:45 GMT

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2258?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated MAPREDUCE-2258:
-----------------------------------

    Status: Patch Available  (was: Open)

> 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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