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https://issues.apache.org/jira/browse/MAPREDUCE-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13425903#comment-13425903
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Thomas Graves commented on MAPREDUCE-4493:
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One minor nit, it might be nice to add a comment by getLocalCacheArchives and
getLocalCacheFiles as to why they were deprecated.
Otherwise looks good. +1.
> Distibuted Cache Compatability Issues
> -------------------------------------
>
> Key: MAPREDUCE-4493
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4493
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2
> Affects Versions: 0.23.3, 2.0.0-alpha, 3.0.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Critical
> Attachments: MR-4493.txt
>
>
> The distributed cache does not work like it does in 1.0.
> mapreduce.job.cache.symlink.create is completely ignored and symlinks are
> always created no matter what. Files and archives without a fragment will
> also have symlinks created.
> If two cache archives or cache files happen to have the same name, or same
> symlink fragment only the last one in the list is localized.
> The localCacheArchives and LocalCacheFiles are not set correctly when these
> duplicates happen causing off by one or more errors for anyone trying to use
> them.
> The reality is that use of symlinking is so common currently that these
> incompatibilities are not that likely to show up, but we still need to fix
> them.
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