Sean Owen commented on SPARK-9487:

I think you can just make the change and see what happens?

> 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
> 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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