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From "Alejandro Abdelnur (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-2293) Enhance MultipleOutputs to allow additional characters in the named output name
Date Tue, 01 Feb 2011 23:52:29 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12989460#comment-12989460
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Alejandro Abdelnur commented on MAPREDUCE-2293:
-----------------------------------------------

The reason for disallowing special chars were:

* to be consistent with the default output names part-#####
* to ensure the final name is valid file name (i.e. using '/' or ' ' would break things)
* to avoid collisions between a named-output and a multinamed-output that is a prefix of the
named-output

IMO these restrictions should stay.


> 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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