Github user robbinspg commented on the pull request:
https://github.com/apache/spark/pull/13355#issuecomment-222104521
Although this patch resolves this particular issue I would echo the comment
in https://github.com/apache/spark/pull/11728 by @zsxwing
{quote}
However, the root cause is there are blocking calls in the event loops but
not enough threads. This could happen in other places (such as netty, akka).
Ideally, we should avoid blocking calls in all event loops. However, it's hard
to figure out all of them in the huge code bases :(
{quote}
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