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https://issues.apache.org/jira/browse/MAPREDUCE-1302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12798595#action_12798595
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Vinod K V commented on MAPREDUCE-1302:
--------------------------------------

Zheng, sorry for the delay, got caught up with other things. MAPREDUCE-1186 got 
committed which invalidated your latest patch. It changed the constructor of 
MRAsyncDiskService and Tasktracker.initialize(). Can you please generate a new 
one?

I myself manually merged the changes for review of code. Rest of the changes 
look good. I'll do a +1 once you upload the updated patch. Thanks for being 
patient!

> 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, 
> MAPREDUCE-1302.2.patch, MAPREDUCE-1302.3.patch, MAPREDUCE-1302.4.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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