Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/5096#issuecomment-91052419
> also, i can't believe how long this build is... sad panda etc.
Test parallelization is going to be a lot of work, but I think we could see
huge speedups for the pull request builders if we didn't run all tests for
every PR. Most PRs touch the higher-level libraries and not core, so it should
be safe to skip most of the tests if core hasn't been modified.
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