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https://issues.apache.org/jira/browse/MAPREDUCE-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790629#action_12790629
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Hemanth Yamijala commented on MAPREDUCE-1186:
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I was concerned that this will actually result in a process launch for the
task-controller for every localized URI. However, I realized that even
pre-HADOOP-4490, there was a process launch because a chmod was done on the
localized file. Given that, I am OK with this proposal. I would recommend we
run some reasonable benchmarks (say a job with lots of files in distributed
cache) with and without the patch a couple of times to see if there's any
impact due to this change.
> While localizing a DistributedCache file, TT sets permissions recursively on
> the whole base-dir
> -----------------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1186
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1186
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: tasktracker
> Affects Versions: 0.21.0
> Reporter: Vinod K V
> Assignee: Amareshwari Sriramadasu
> Fix For: 0.21.0
>
> Attachments: patch-1186-1.txt, patch-1186-3-ydist.txt,
> patch-1186-3-ydist.txt, patch-1186-ydist.txt, patch-1186-ydist.txt,
> patch-1186.txt
>
>
> This is a performance problem.
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