Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/17059
@datumbox you mention there is GC & performance overhead which makes some
sense. Have you run into problems with very large scale (like millions users &
items & ratings)? I did regression tests
[here](https://docs.google.com/spreadsheets/d/1iX5LisfXcZSTCHp8VPoo5z-eCO85A5VsZDtZ5e475ks/edit?usp=sharing)
- admittedly vs `1.6.1` at that time
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