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https://issues.apache.org/jira/browse/SPARK-3431?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14234783#comment-14234783
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Nicholas Chammas commented on SPARK-3431:
-----------------------------------------

As an aside, I expect there to be some work required to let certain tests play 
nicely with one another. But if we figure out how to specify test groupings and 
make sure the forked JVMs are configured correctly, refactoring tests where 
necessary should be very doable.

> Parallelize execution of tests
> ------------------------------
>
>                 Key: SPARK-3431
>                 URL: https://issues.apache.org/jira/browse/SPARK-3431
>             Project: Spark
>          Issue Type: Improvement
>          Components: Build
>            Reporter: Nicholas Chammas
>
> Running all the tests in {{dev/run-tests}} takes up to 2 hours. A common 
> strategy to cut test time down is to parallelize the execution of the tests. 
> Doing that may in turn require some prerequisite changes to be made to how 
> certain tests run.



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