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From "Gabriel Reid (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CRUNCH-139) PCollection#length doesn't always reduce the count to a single value
Date Mon, 07 Jan 2013 16:22:12 GMT
Gabriel Reid created CRUNCH-139:
-----------------------------------

             Summary: 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


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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