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https://issues.apache.org/jira/browse/MAPREDUCE-3824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13202788#comment-13202788
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Allen Wittenauer commented on MAPREDUCE-3824:
---------------------------------------------

Part of the reason why distribute cache is a mystery as to how it actually 
works in practice is due to the lack of active debugging.  Note that most of 
this patch is LOG.debug() statements. :(

                
> Distributed caches are not removed properly
> -------------------------------------------
>
>                 Key: MAPREDUCE-3824
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3824
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: distributed-cache
>    Affects Versions: 1.0.0
>            Reporter: Allen Wittenauer
>            Priority: Critical
>         Attachments: MAPREDUCE-3824-branch-1.0.txt
>
>
> Distributed caches are not being properly removed by the TaskTracker when 
> they are expected to be expired. 

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