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From "Omkar Vinit Joshi (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-4493) Distibuted Cache Compatability Issues
Date Fri, 19 Jul 2013 15:56:48 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-4493?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13713786#comment-13713786
] 

Omkar Vinit Joshi commented on MAPREDUCE-4493:
----------------------------------------------

[~revans2] sounds good.. however by this we will be putting limitation based on file name
..but that sounds reasonable considering the fact that this will stop potential bugs in map
code and users can definitely version them to avoid it... Thanks...
                
> 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
>             Fix For: 0.23.3, 2.0.2-alpha
>
>         Attachments: MR-4493.txt, MR-4493.txt, 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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