Github user mccheah commented on the issue:
https://github.com/apache/spark/pull/21238
@andrusha I don't think it's entirely analogous - for the simple reason
that the hostPath volumes PR doesn't take into account `SPARK_LOCAL_DIRS`. That
environment variable is used to determine the right place for shuffle files. We
want to strictly tie that setting to emptydir volumes - and moreover this
should be done transparently for the user, i.e. the user shouldn't have to know
to provision these volumes to get better performance.
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