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From "Mikael Goldmann (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CRUNCH-601) Short PCollections is SparkPipeline get length null.
Date Tue, 12 Apr 2016 16:27:25 GMT

     [ https://issues.apache.org/jira/browse/CRUNCH-601?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikael Goldmann updated CRUNCH-601:
-----------------------------------
    Description: 
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.


  was:
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 user 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.



> Short PCollections is 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
>            Priority: Minor
>         Attachments: 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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