Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/18281
I made a few comments.
I'm not sure if we should expose `getExecutionContext` as a public method
for now? I think it might be best to leave it private for now and we can always
expose it later if there is user demand.
Also, this now changes the default behavior of `OneVsRest`. Currently,
`par` would use the default threadpool when fitting. In most cases, this would
mean "full" parallelism by default (up to the number of core which in most
cases would be larger than the number of classes). We need to decide if this is
what we want. If so it needs to be documented in the migration guide.
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