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https://issues.apache.org/jira/browse/MAPREDUCE-5470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13747129#comment-13747129
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Sandy Ryza commented on MAPREDUCE-5470:
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Oh I see where I went wrong. I thought the task dirs were always placed under
localJobDir (which is used for writing the job conf) and that I was reusing
code by using localJobDir to construct the task path. But they're actually
actually in different places. The localJobDir is placed relative to current
working directory, while the task dirs are placed under
mapreduce.cluster.local.dir.
So either should move the task dirs under localJobDir or change back the part
related to task dirs. It's not obvious to me which is better.
> LocalJobRunner does not work on Windows.
> ----------------------------------------
>
> Key: MAPREDUCE-5470
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5470
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 3.0.0, 2.1.1-beta
> Reporter: Chris Nauroth
>
> {{LocalJobRunner#getLocalTaskDir}} creates a directory that is unique to the
> task ID. The logic of this method concatenates the local job dir and a
> task-specific path, but one of the arguments is a {{Path}} with a scheme, so
> the final result has "file:" embedded in it. This works on Linux, but the
> ':' is an invalid character in a file name on Windows.
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