Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/2485#issuecomment-56865310
@nishkamravi2 arrived at this through experimentation. He had a few
details on his experiments on the previous incarnation of this PR #1391 . If
anything, I think 0.07 is conservative. I would not be surprised if I counted
and discovered we hit this issue with every customer of ours running a decently
sized executor on YARN, and they normally need to increase beyond 0.07.
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