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Posted to dev@crunch.apache.org by "Josh Wills (JIRA)" <ji...@apache.org> on 2012/08/28 03:14:08 UTC

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

     [ https://issues.apache.org/jira/browse/CRUNCH-51?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Josh Wills updated CRUNCH-51:
-----------------------------

    Affects Version/s: 0.3.0
    
> 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
>
> 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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