Github user srowen commented on the issue:
https://github.com/apache/spark/pull/16513
I think https://issues.apache.org/jira/browse/SPARK-13796 downgraded to
warning from error; it might make sense to lower it further, but I'm not clear
whether it should happen in normal operation? if not then it might be useful to
keep the message until it's clear why this is happening reproducibly?
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