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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-167) Sort.sortTuples and related methods write out duplicate values
Date Sun, 24 Feb 2013 21:06:14 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-167?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Josh Wills updated CRUNCH-167:
------------------------------

    Attachment: CRUNCH-167-t2.patch

Thanks Gabriel-- updated the patch based on your feedback, and I added an integration test
that fails under the old Sort lib but works under the new one. This is the one I will commit.
                
> Sort.sortTuples and related methods write out duplicate values
> --------------------------------------------------------------
>
>                 Key: CRUNCH-167
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-167
>             Project: Crunch
>          Issue Type: Bug
>    Affects Versions: 0.4.0, 0.5.0
>            Reporter: Josh Wills
>             Fix For: 0.6.0
>
>         Attachments: CRUNCH-167.patch, CRUNCH-167-t2.patch
>
>
> I noticed when I was debugging CRUNCH-166 that the strategy that the Sort.sortPairs,
sortTrips, etc. methods are using has the potential to write out duplicate values in cases
where we are only sorting/grouping on a subset of the fields, because all of the records that
have the same value for those sub-fields will be called as part of the same reduce() call,
where only a single one of the records that had the same set of values for those sub-fields
will be used as the key, and the rest of the values will have been thrown away.

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