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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1568) TrackerDistributedCacheManager should do deleteLocalPath asynchronously
Date Fri, 23 Apr 2010 01:27:50 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1568?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12860091#action_12860091

Zheng Shao commented on MAPREDUCE-1568:


> TrackerDistributedCacheManager should do deleteLocalPath asynchronously
> -----------------------------------------------------------------------
>                 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.txt
> TrackerDistributedCacheManager.deleteCache() has been improved:
> MAPREDUCE-1302 makes TrackerDistributedCacheManager rename the caches in the main thread
and then delete them in the background 
> MAPREDUCE-1098 avoids global locking while do the renaming (renaming lots of directories
can also takes a long time)
> But the deleteLocalCache is still in the main thread of TaskRunner.run(). So it will
still slow down the task which triggers the deletion (originally this will blocks all tasks,
but it is fixed by MAPREDUCE-1098). Other tasks do not wait for the deletion. The task which
triggers the deletion should not wait for this either. TrackerDistributedCacheManager should
do deleteLocalPath() asynchronously.

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