my streaming application always do Key by the some keys with event timestamp, 
such as  keyBy( “qps_1520777430”), so the expired keys(1 hours ago) are useless.

And I use rocksdb to store the state,  I want to know What's the best way to 
clean up the expired rocksdb state, should I must implement a ProcessFunction 
and set a time ticker to do that?

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