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https://issues.apache.org/jira/browse/SPARK-9487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15733832#comment-15733832
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Sean Owen commented on SPARK-9487:
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(Which thread?) I think that if you can get all tests in one language updated
uniformly to pass with a different number of threads, that would be a
sufficient unit of work to commit. I know it's not small. Or, maybe even a
couple modules along with associated test improvements that make them robust to
the number of threads. If you can get a significant logical chunk of
improvement working we can commit it as a step towards a resolution.
> Use the same num. worker threads in Scala/Python unit tests
> -----------------------------------------------------------
>
> Key: SPARK-9487
> URL: https://issues.apache.org/jira/browse/SPARK-9487
> Project: Spark
> Issue Type: Improvement
> Components: PySpark, Spark Core, SQL, Tests
> Affects Versions: 1.5.0
> Reporter: Xiangrui Meng
> Labels: starter
> Attachments: ContextCleanerSuiteResults, HeartbeatReceiverSuiteResults
>
>
> In Python we use `local[4]` for unit tests, while in Scala/Java we use
> `local[2]` and `local` for some unit tests in SQL, MLLib, and other
> components. If the operation depends on partition IDs, e.g., random number
> generator, this will lead to different result in Python and Scala/Java. It
> would be nice to use the same number in all unit tests.
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