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https://issues.apache.org/jira/browse/CRUNCH-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14101825#comment-14101825
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Jeremy Beard commented on CRUNCH-464:
-------------------------------------
Fix is to emit a 0 at the cleanup() of each DoFn instantiation, forcing a sum
when there are no input records.
> Empty PCollection returns null Long for length().getValue()
> -----------------------------------------------------------
>
> Key: CRUNCH-464
> URL: https://issues.apache.org/jira/browse/CRUNCH-464
> Project: Crunch
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.10.0
> Reporter: Jeremy Beard
> Assignee: Josh Wills
> Attachments: CRUNCH-464.patch
>
>
> PCollection lengths are determined by summing 1s for each record, but when
> the PCollection is empty there is no sum and so the PObject returns a null
> length.
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