Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/634#issuecomment-49429447
He had increased it to 30 seconds based on some experiments he did. I
guess it depends on how well the scheduler recovers from starting with fewer
executors. I know they have been doing a bit of work around this area but I'm
not sure the real affect. I have definitely seen issues with jobs when they
start to soon so I think I would rather leave it at 30 for now unless we have
more concrete data saying its not longer an issue.
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