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From "Mikael Goldmann (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-601) Short PCollections in SparkPipeline get length null.
Date Fri, 26 Aug 2016 06:35:20 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-601?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15438550#comment-15438550
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Mikael Goldmann commented on CRUNCH-601:
----------------------------------------

[~jwills], [~mkwhitacre], thank you for looking into this.

> Short PCollections in SparkPipeline get length null.
> ----------------------------------------------------
>
>                 Key: CRUNCH-601
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-601
>             Project: Crunch
>          Issue Type: Bug
>          Components: Spark
>    Affects Versions: 0.13.0
>         Environment: Running in local mode on Mac as well as in a ubuntu 14.04 docker
container
>            Reporter: Mikael Goldmann
>            Assignee: Micah Whitacre
>            Priority: Minor
>             Fix For: 0.15.0
>
>         Attachments: CRUNCH-601-jw.patch, CRUNCH-601.patch, CRUNCH-601b.patch, CRUNCH-601c.patch,
CRUNCH-601d.patch, SmallCollectionLengthTest.java
>
>
> I'll attach a file with a test that I would expect to pass but which fails.
> It creates five PCollection<String> of lengths 0, 1, 2, 3, 4 gets the lengths,
runs the pipeline and prints the lengths. Finally it asserts that all lengths are non-null.
> I would expect it to print lengths 0, 1, 2, 3, 4 and pass.
> What it does is print lengths null, null, null, 3, 4 and fail.
> I think the underlying reason is the use of getSize() on an unmaterialized object and
assuming that when the estimate that getSize() returns is 0, then the PCollection is guaranteed
to be empty, which is false in some cases.



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