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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1302) TrackerDistributedCacheManager can delete file asynchronously
Date Mon, 28 Dec 2009 18:53:29 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12794865#action_12794865
] 

Zheng Shao commented on MAPREDUCE-1302:
---------------------------------------

Good question. There is no special handling right now.
I will list the directory and create one task per item returned.


> TrackerDistributedCacheManager can delete file asynchronously
> -------------------------------------------------------------
>
>                 Key: MAPREDUCE-1302
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-1302
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: tasktracker
>    Affects Versions: 0.20.2, 0.21.0, 0.22.0
>            Reporter: Zheng Shao
>            Assignee: Zheng Shao
>         Attachments: MAPREDUCE-1302.0.patch, MAPREDUCE-1302.1.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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