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https://issues.apache.org/jira/browse/CRUNCH-51?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459797#comment-13459797
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Gabriel Reid commented on CRUNCH-51:
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Going point about the types in the distributed cache vs types being given to
the partitioner -- I think that using the MapFn in the PType should be
sufficient for this though.
I'm taking a look at hacking in the PCollection reading into the partitioner
instead of the sequence file; that definitely looks to be the biggest chunk of
work in there.
> 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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