Github user srowen commented on the issue:

    https://github.com/apache/spark/pull/16527
  
    How about this: change all three instances to trim the retained data to the 
configured maximum, but, to remove at least (0.1 * maxRetained) items.
    
    If max is 100 and there are 150 items, it would trim to leave 100 rather 
than all the way to 90.
    If max is 100 and there are 101 items it would trim 10 (0.1 * 100) to leave 
91, not just 100.
    
    That addresses the concern, maintains current behavior in more cases, and 
actually restores some behavior from before the previous change.
    
    That and a small note in the docs that this is a target maximum and that 
fewer elements may be retained in some circumstances.


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