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https://issues.apache.org/jira/browse/MAPREDUCE-2293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989795#comment-12989795
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Allen Wittenauer commented on MAPREDUCE-2293:
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It would be very useful to have the HDFS folks chime in... my understanding is
that HDFS is essentially UTF-16 by virtue of using java String everywhere. So
it makes complete sense to only block the character /.
I'm curious as to why the NULL character causes issues.
If users want to shoot themselves in the foot by naming things inconsistently,
that isn't our place to get in their way.
> 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 Chouraria
> Priority: Minor
> Attachments: mapreduce.mo.removecheck.r1.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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