Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/2046#issuecomment-52814658
Probably also a good idea, but tests ought to try to behave well -- write
to temp dirs, not the source tree, and clean up reliably. I suppose it helps
ensure test state isn't accidentally picked up by subsequent runs too. It's not
just an issue for RAT and Jenkins, but for devs. For a while tests were not
cleaning up a "work" directory, and I ended up with hundreds of thousands of
files under it. (That's fixed now.) My IDE was trying to index them. Stuff like
that is a minor problem.
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