[jira] [Commented] (CRUNCH-51) PCollection#sort relies on using a single reducer for total order sorting

["Gabriel Reid (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CRUNCH-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13449954#comment-13449954 ] 

Gabriel Reid commented on CRUNCH-51:
------------------------------------

I'm just about to head (mostly) out of radio contact for about two weeks, so I might not be able to get a good look at this until after then. I'll definitely dig into this once I'm back unless someone else can take it up in the meantime.
                
> 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
>
>
> 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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