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Date: Thu, 29 Nov 2012 00:55:59 +0000 (UTC)
From: "John Jensen (JIRA)" <jira@apache.org>
To: crunch-dev@incubator.apache.org
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Subject: [jira] [Commented] (CRUNCH-51) PCollection#sort relies on using a
 single reducer for total order sorting
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    [ https://issues.apache.org/jira/browse/CRUNCH-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13506096#comment-13506096 ] 

John Jensen commented on CRUNCH-51:
-----------------------------------

Gabriel, 

are you still looking at this? Otherwise I may take a stab.
                
> PCollection#sort relies on using a single reducer for total order sorting
> -------------------------------------------------------------------------
>
>                 Key: CRUNCH-51
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-51
>             Project: Crunch
>          Issue Type: Improvement
>    Affects Versions: 0.3.0
>            Reporter: Gabriel Reid
>         Attachments: 0001-CRUNCH-51-Total-Order-Sort.patch, CRUNCH-51.patch, CRUNCH-51.patch, SortTest.java
>
>
> The total-order sorting provided by the Sort class (and therefore PCollection#sort) relies on using a single reducer in order to provide total-order sorting. This is very inefficient for large datasets, and should be replaced with a total order partitioner instead.
> For more information, see CRUNCH-23 (and possibly also MAPREDUCE-4574).

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