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Posted to mapreduce-issues@hadoop.apache.org by "Amareshwari Sriramadasu (JIRA)" <ji...@apache.org> on 2009/12/16 08:52:18 UTC

[jira] Commented: (MAPREDUCE-1302) TrackerDistributedCacheManager can delete file asynchronously

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12791255#action_12791255 ] 

Amareshwari Sriramadasu commented on MAPREDUCE-1302:
----------------------------------------------------

There is known issue with deletion, see MAPREDUCE-1141. Deletion should not happen by task localization, it should be done by separate thread in TaskTracker (CleanupQueue ?). 

> TrackerDistributedCacheManager can delete file asynchronously
> -------------------------------------------------------------
>
>                 Key: MAPREDUCE-1302
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1302
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: MAPREDUCE-1302.0.patch
>
>
> With the help of AsyncDiskService from MAPREDUCE-1213, we should be able to delete files from distributed cache asynchronously.
> That will help make task initialization faster, because task initialization calls the code that localizes files into the cache and may delete some other files.
> The deletion can slow down the task initialization speed.

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