Github user steveloughran commented on the issue:
https://github.com/apache/spark/pull/7786
@vanzin I suspect that if you get told you are being pre-empted, you aren't
likely to get containers elsewhere âpre-emption is a sign of demand being too
high, and your queue lower priority. But pre-requesting a new container while
continuing the current work might be a nice trick, keeping the live executors
busy while queueing up early requests for the replacements
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