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https://issues.apache.org/jira/browse/CRUNCH-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13419880#comment-13419880
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Josh Wills commented on CRUNCH-23:
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We're going to need something along the lines of this:
http://chasebradford.wordpress.com/2010/12/12/reusable-total-order-sorting-in-hadoop/
> PCollection#sort doesn't do a full sort on values
> -------------------------------------------------
>
> Key: CRUNCH-23
> URL: https://issues.apache.org/jira/browse/CRUNCH-23
> Project: Crunch
> Issue Type: Bug
> Reporter: Gabriel Reid
> Attachments: SortTest.java
>
>
> When a PCollection is sorted (using PCollection#sort), the sorting that is
> performed is only per reducer, and not an absolute sort over all values. This
> means that the values are not in sorted order if they are iterated over on a
> materialized collection. It also means that the sorted files that are output
> from a sort operation can not be simply concatenated to come to a single
> sorted file.
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