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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-468) MemPipeline.collectionOf() leads to NPE in PCollection.length()
Date Mon, 01 Sep 2014 17:28:21 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-468?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14117580#comment-14117580
] 

Josh Wills commented on CRUNCH-468:
-----------------------------------

Yeah, so this doesn't happen with typedCollectionOf. It seems like the right thing to do would
be to have collectionOf attempt to infer a PType from the class of the object it contains
by default, and we could have a method on MemPipeline that would allow you to control what
the default PTypeFamily was-- Writable is probably the right choice.

> MemPipeline.collectionOf() leads to NPE in PCollection.length()
> ---------------------------------------------------------------
>
>                 Key: CRUNCH-468
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-468
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.10.0
>            Reporter: Jeremy Beard
>            Assignee: Josh Wills
>
> MemPipeline.collectionOf() creates a PCollection with a null PTypeFamily. When PCollection.length()
is run it uses the PTypeFamily of the PCollection to serialize the running count of the records,
which leads to a NPE for PCollections created as above.



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