lukecwik commented on pull request #15549:
URL: https://github.com/apache/beam/pull/15549#issuecomment-981853481


   > 
   
   You need to be able to use a generated Redis cursor otherwise your not going 
to have much value converting RedisIO to an SDF.
   
   Try looking at https://engineering.q42.nl/redis-scan-cursor/ as it goes into 
a bunch of detail about how the cursors are translated back and forth. They 
even allude to that you can generate the cursors at arbitrary percentiles which 
is what we were looking for here. 
https://www.freecodecamp.org/news/redis-hash-table-scan-explained-537cc8bb9f52/ 
goes into the internal redis server implementation details.


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