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https://issues.apache.org/jira/browse/MAPREDUCE-2293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13191288#comment-13191288
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David Rosenstrauch commented on MAPREDUCE-2293:
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:-(
> Enhance MultipleOutputs to allow additional characters in the named output
> name
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-2293
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2293
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Affects Versions: 0.21.0
> Reporter: David Rosenstrauch
> Assignee: Harsh J
> Priority: Minor
> Fix For: 0.24.0
>
> Attachments: mapreduce.mo.removecheck.r1.diff,
> mapreduce.mo.removecheck.r2.diff, mapreduce.mo.removecheck.r3.diff
>
>
> Currently you are only allowed to use alpha-numeric characters in a named
> output name in the MultipleOutputs class. This is a bit of an onerous
> restriction, as it would be extremely convenient to be able to use non
> alpha-numerics in the name too. (E.g., a '.' character would be very
> helpful, so that you can use the named output name for holding a file
> name/extension. Perhaps '-' and a '_' characters as well.)
> The restriction seems to be somewhat arbitrary - it appears to be only
> enforced in the checkTokenName method. (Though I don't know if there's any
> downstream impact by loosening this restriction.)
> Would be extremely helpful/useful to have this fixed though!
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