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

    [ https://issues.apache.org/jira/browse/CRUNCH-162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13602076#comment-13602076
] 

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 http://mail-archives.apache.org/mod_mbox/incubator-crunch-user/201302.mbox/%3CBLU0-SMTP1025B0E41417FA7A978C833AD070@phx.gbl%3E).
                
> Add utility function for merging output by identity reduce
> ----------------------------------------------------------
>
>                 Key: CRUNCH-162
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-162
>             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: http://mail-archives.apache.org/mod_mbox/incubator-crunch-user/201302.mbox/%3CCAFZSZPsXRxWT45c9w4ef7Ruij2exE4HP2CDNMjd%2BVc%3D9RWX-Jw%40mail.gmail.com%3E

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