Github user squito commented on the issue:
https://github.com/apache/spark/pull/21068
A couple more high-level thoughts:
1) Do we want to have a event posted about the node getting blacklisted? I
think it would be useful. But then there needs to be a msg from the
YarnAllocator back to the driver about the blacklisting.
2) I was thinking about how this interacts with
[SPARK-13669](https://issues.apache.org/jira/browse/SPARK-13669). at first I
was thinking this makes that entirely unnecessary, but I guess that is not true
-- that is still useful if the external shuffle service goes down *after* the
executor is started.
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