Hi, 

I’m using MapState to deduplicate some ids and the MapState needs to be 
truncated periodically. I tried to use ProcessingTimeCallback to call 
state.clear(), but in this way I can only clear the state for one key, and 
actually I need a key group level cleanup. So I’m wondering is there any best 
practice for my case? Thanks a lot!

Best,
Paul Lam

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