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Posted to dev@crunch.apache.org by "Jeremy Beard (JIRA)" <ji...@apache.org> on 2014/08/19 06:23:18 UTC

[jira] [Commented] (CRUNCH-464) Empty PCollection returns null Long for length().getValue()

    [ https://issues.apache.org/jira/browse/CRUNCH-464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14101825#comment-14101825 ] 

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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