Github user blyncsy-david-lewis commented on the issue:
https://github.com/apache/spark/pull/19456
I have a multiuser application where I use the userId as the name of the
scheduling pool so that users are balanced equally by spark and within a user's
workload I can set the scheduling mode to FAIR (or whatever I want). It is
unreasonable to specify xml for each user and restart spark, so this patch
allows me to specify the default configuration used by undefined pools.
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