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From "Chao Shi (JIRA)" <>
Subject [jira] [Commented] (CRUNCH-162) Add utility function for merging output by identity reduce
Date Thu, 14 Mar 2013 06:08:13 GMT


Chao Shi commented on CRUNCH-162:

If I understand correctly, shard/reshard behaves like a fence in optimization. All operations
made before shard/reshard will not run with later operations in a same MR stage. This would
help to solve my problem (as stated in
> Add utility function for merging output by identity reduce
> ----------------------------------------------------------
>                 Key: CRUNCH-162
>                 URL:
>             Project: Crunch
>          Issue Type: Improvement
>          Components: MapReduce Patterns
>    Affects Versions: 0.4.0
>            Reporter: Dave Beech
>            Priority: Minor
> Something I find myself doing reasonably often in mapreduce is to use
> the reduce step as nothing more than a means to merge data into larger
> files (using the identity reducer). 
> There doesn't appear to be a neat way to do this with Crunch at the moment.
> Ref:

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