rkhachatryan commented on pull request #18989:
URL: https://github.com/apache/flink/pull/18989#issuecomment-1060912214


   The requirements for keyBy partitioning are a bit different: distribute keys 
across groups as evenly as possible (and there are much more keys than key 
groups).
   For materialization, selected values should be equi-distant from each other 
as much as possible (and there are much less backends than possible delay 
values).
   
   (AFAIK, murmur hash is used in keyBy partitioning)


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