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Date: Tue, 27 Apr 2010 15:21:48 -0400 (EDT)
From: "Scott Chen (JIRA)" <jira@apache.org>
To: mapreduce-issues@hadoop.apache.org
Subject: [jira] Commented: (MAPREDUCE-1568) TrackerDistributedCacheManager
 should clean up cache in a background thread
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    [ https://issues.apache.org/jira/browse/MAPREDUCE-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861506#action_12861506 ] 

Scott Chen commented on MAPREDUCE-1568:
---------------------------------------

Thanks for the comment. Your comments are very helpful. I wil update the patch soon.

> TrackerDistributedCacheManager should clean up cache in a background thread
> ---------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-1568
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1568
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>    Affects Versions: 0.22.0
>            Reporter: Scott Chen
>            Assignee: Scott Chen
>             Fix For: 0.22.0
>
>         Attachments: MAPREDUCE-1568-v2.1.txt, MAPREDUCE-1568-v2.txt, MAPREDUCE-1568.txt
>
>
> Right now the TrackerDistributedCacheManager do the clean up with the following code path:
> {code}
> TaskRunner.run() -> 
> TrackerDistributedCacheManager.setup() ->
> TrackerDistributedCacheManager.getLocalCache() -> 
> TrackerDistributedCacheManager.deleteCache()
> {code}
> The deletion of the cache files can take a long time and it should not be done by a task. We suggest that there should be a separate thread checking and clean up the cache files.

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