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https://issues.apache.org/jira/browse/SPARK-9487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15659318#comment-15659318
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Sean Owen commented on SPARK-9487:
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No, it's almost certain that your changes introduced the test failure. It keeps
failing. JavaAPISuite does not fail on Jenkins in master.
The problem is that it's not 100% certain that a (real) failure in Jenkins is
reproducible in your different, local environment. This can make debugging
quite hard. Still it's worth trying to figure out how the test would fail based
on Jenkins output and try to fix it; we can't merge a change that breaks tests
for the build system of reference.
> 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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