Github user ConeyLiu commented on the issue:

    https://github.com/apache/spark/pull/17936
  
    I did not directly test this situation. But I have test the this pr 
compared with latest `ALS`(after merge #17742 ). In `ALS`, the both RDDs are 
cached, and also grouped the iterator(iterator.grouped). You can see the test 
result above, and the directly test I will give next week due to due to 
maintenance of server.


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