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https://issues.apache.org/jira/browse/HADOOP-8734?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13454539#comment-13454539
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Bikas Saha commented on HADOOP-8734:
------------------------------------

So if I understand this right, this fixes a generic deficiency in 
LocalJobRunner which wasnt showing up because by default files are public to 
read on Linux FS and so LocalJobRunner would not see issues in accessing 
private distributed cache from the local FS.
Also, this would make the change to TestMRWithDistributedCache unnecessary?
                
> LocalJobRunner does not support private distributed cache
> ---------------------------------------------------------
>
>                 Key: HADOOP-8734
>                 URL: https://issues.apache.org/jira/browse/HADOOP-8734
>             Project: Hadoop Common
>          Issue Type: Bug
>          Components: filecache
>            Reporter: Ivan Mitic
>            Assignee: Ivan Mitic
>         Attachments: HADOOP-8734-LocalJobRunner.patch
>
>
> It seems that LocalJobRunner does not support private distributed cache. The 
> issue is more visible on Windows as all DC files are private by default (see 
> HADOOP-8731).

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