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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CRUNCH-139) PCollection#length doesn't always reduce the count to a single value
Date Mon, 07 Jan 2013 16:26:12 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-139?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gabriel Reid resolved CRUNCH-139.
---------------------------------

    Resolution: Fixed

Pushed to master
                
> PCollection#length doesn't always reduce the count to a single value
> --------------------------------------------------------------------
>
>                 Key: CRUNCH-139
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-139
>             Project: Crunch
>          Issue Type: Bug
>            Reporter: Gabriel Reid
>            Assignee: Gabriel Reid
>             Fix For: 0.5.0
>
>         Attachments: CRUNCH-139.patch
>
>
> PCollection#length doesn't explicitly set the number of reducers to 1, which means that
the output of the counting mappers can be partitioned. This results only a partial count (i.e.
an incorrect value) being returned in the length PObject if the input PCollection spans multiple
default reduce partitions.

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