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https://issues.apache.org/jira/browse/CRUNCH-91?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13472204#comment-13472204
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Matthias Friedrich commented on CRUNCH-91:
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I'm all for having better control over output file names, I need it at work
occasionally, too.
> Enable custom output file naming
> --------------------------------
>
> Key: CRUNCH-91
> URL: https://issues.apache.org/jira/browse/CRUNCH-91
> Project: Crunch
> Issue Type: Improvement
> Reporter: Gabriel Reid
> Attachments: CRUNCH-91.patch
>
>
> The current output file naming behavior in Crunch is to use the classic
> Hadoop-style file naming (i.e. part-m-00001, part-r-00002), with the
> numerical part of the filename being set based on the number of existing
> files in the output directory to avoid naming collisions.
> The intention of this issue is to allow developers to define their own output
> file names for Crunch output files.
> The original underlying motivation for this issue is having a custom
> partitioner in a job which routes records to a specific partition (and
> therefore reducer) based on content of the record, and then needing to
> perform file renaming operations on the output files to allow their names to
> include specific information about the partition they contain. The partition
> number of files currently gets discarded by Crunch, making this renaming
> impossible. The approach proposed here (custom file naming within Crunch)
> goes one step further, giving developers a hook to actually define their own
> output file naming scheme.
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