Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/9910#issuecomment-158957920
I tend to agree with that, if in fact this is a warning only, and somewhat
commonly encountered in normal operation during shutdown. This code path
doesn't only occur during shutdown, but I do tend to agree with making the
exception "optional" at the warning level here anyway.
It also rests on the assumption that the case observed in the JIRA is
ignorable and just a side effect of components shutting down asynchronously and
occasionally complaining that something can't be contacted.
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