Github user MLnick commented on the issue:
https://github.com/apache/spark/pull/17845
Some quick perf numbers:
Using `ml-latest` dataset (~24 million ratings, ~260k users, ~39k movies);
4x workers 48 cores 100GB RAM each.
`rank = 10, k = 10`
master | this PR
------------ | -------------
`recommendForAllUsers`
369s | 16s
`recommendForAllItems`
547s | 15s
So 23-37x improvement.
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