Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/4048#issuecomment-70212728
@squito another thing is that we should look at whether these tests really
need to be integration style tests or not. I've seen people often use
`local-cluster` because it's easier to write as an integration test, even if
they just put more effort in they could write a proper unit test.
Alternatively we could try and see if we can run these `local-cluster`
tests more quickly in general. I don't think anyone has tried to optimize the
execution time of that test path much.
In an ideal world the vast majority of our tests would actually be unit
tests - i.e. they would run in milliseconds, so that we can have thousands of
tests and have them run in a reasonable amount of time.
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