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From "Robert Joseph Evans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-4493) Distibuted Cache Compatability Issues
Date Fri, 27 Jul 2012 20:57:34 GMT
Robert Joseph Evans created MAPREDUCE-4493:

             Summary: 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: 2.0.0-alpha, 0.23.3, 3.0.0
            Reporter: Robert Joseph Evans
            Assignee: Robert Joseph Evans
            Priority: Blocker

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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