Github user tgravescs commented on the issue:
https://github.com/apache/spark/pull/15249
for 1) We definitely run multiple executors on a node on Yarn but I would
certainly hope this isn't a huge issue. Perhaps @mridulm can clarify on when
he was seeing this, but I would assume it is only if YARN kills the executor,
otherwise if spark is shutting it down there shouldn't be any tasks on it.
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