Github user squito commented on the pull request: https://github.com/apache/spark/pull/4048#issuecomment-70008794 @pwendell To be honest I'd never had the patience to run all the tests before on my laptop. But I just tried them both again: 237 seconds vs. 852 seconds (just for core), so these tests are down to ~25% of the total time. It makes using `test-quick` a reality, while I have no end of complaints about sbt, I really like `test-quick`. @vanzin yeah there are also a bunch of tests in other projects, I know there are a bunch in mllib as well. (I guess this is really a WIP at this point, wanted to see if I folks like the idea before I do it in other projects.) @srowen I wasn't familiar with `surefire` or `failsafe` from maven, but I figured there was some other way to just support an integration test separation. I am just more familiar with tagging tests, and I think it buys us some more flexibility. I'll see if I can figure out how to setup a maven task (or whatever its called) to only run the unit tests, but I know very little about maven ...
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