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From "Scott Chen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1568) TrackerDistributedCacheManager should clean up cache in a background thread
Date Tue, 27 Apr 2010 19:42:32 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861509#action_12861509
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Scott Chen commented on MAPREDUCE-1568:
---------------------------------------

Hi Amareshwari, I have a stupid question.
{quote}
Though not related to this issue, can you add a comment for CacheStatus.refCount saying it
should be always accessed under the global cachedArchives lock.
{quote}
I also notice this in the code. It is guarded by cachedArchives everywhere in the code. But
why locking the individual cachestatus is not enough?

> 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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