Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/16774
I'd say coming up with a heuristic or algorithm to automatically set the
parallel execution param is going to be pretty challenging, since it depends on
the details of the individual pipeline components, cluster resources, etc. So
for now let's leave it fixed.
I think setting the default to match current behavior is best (i.e. `1`).
We can add a section to the docs explaining its effect, and also add a couple
lines to each example to illustrate typical usage.
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