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https://issues.apache.org/jira/browse/MAPREDUCE-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13573191#comment-13573191
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Chris Nauroth commented on MAPREDUCE-4987:
------------------------------------------
In {{TestMRJobs}}, the last assertion in this code fragment fails:
{code}
// Check lengths of the files
Map<String, Path> filesMap = pathsToMap(files);
Assert.assertTrue(filesMap.containsKey("distributed.first.symlink"));
Assert.assertEquals(1, localFs.getFileStatus(
filesMap.get("distributed.first.symlink")).getLen());
{code}
This is a known issue with Java 6 on Windows. It always reports a symlink as
having length zero instead of the length of the target file. This problem was
fixed on branch-1-win in HADOOP-9061 by detecting if the runtime environment is
Windows + Java 6, and if so, copying files into the symlink location instead of
actually creating a symlink. Applying the same logic to branch-trunk-win will
require different code changes. In YARN, the symlinks for the distributed
cache get generated by the container launch scripts. See
{{ContainerLaunch#WindowsShellScriptBuilder#link}}.
> TestMRJobs#testDistributedCache fails on Windows due to unexpected behavior
> of symlinks
> ---------------------------------------------------------------------------------------
>
> Key: MAPREDUCE-4987
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4987
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: distributed-cache, nodemanager
> Affects Versions: trunk-win
> Reporter: Chris Nauroth
>
> On Windows, {{TestMRJobs#testDistributedCache}} fails on an assertion while
> checking the length of a symlink. It expects to see the length of the target
> of the symlink, but Java 6 on Windows always reports that a symlink has
> length 0.
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