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From "Rahul Sharma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-23) PCollection#sort doesn't do a full sort on values
Date Thu, 23 Aug 2012 09:21:42 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-23?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440170#comment-13440170
] 

Rahul Sharma commented on CRUNCH-23:
------------------------------------

Gabriel, I check the patch for avro files. It does not work. My bad, should have verified
it earlier. Also while fixing it I am getting stuck at a point. In the end the TotalOrdePartioner
requires a SequenceFile. How can I make one using the keys from Avro data? Still trying out
a few options e.g. configuring AvroSequenceFileOutputFormat.

                
> 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
>            Assignee: Rahul Sharma
>         Attachments: 0001-CRUNCH-23-fix-sorting.patch, CRUNCH-23-sorting-issue.patch,
CRUNCH-23-used-TotalOrderpartioner-for-sorting-keys.patch, 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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