Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/12273#issuecomment-208218583
Aha, I think the bug is actually that the `if (activeContext.get() != null)
{` block should occur outside the `foreach` block. There's no reason to only
check it if another context is being constructed. It needs to be checked in all
cases.
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