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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