eliaslevy commented on a change in pull request #6379: [FLINK-9637] Add public 
user documentation for state TTL feature
URL: https://github.com/apache/flink/pull/6379#discussion_r205990622
 
 

 ##########
 File path: docs/dev/stream/state/state.md
 ##########
 @@ -266,6 +266,92 @@ a `ValueState`. Once the count reaches 2 it will emit the 
average and clear the
 we start over from `0`. Note that this would keep a different state value for 
each different input
 key if we had tuples with different values in the first field.
 
+### State time-to-live (TTL)
+
+A time-to-live (TTL) can be assigned to the keyed state value. 
+In this case it will expire after the configured TTL
+and its stored value will be cleaned up based on the best effort.
+Depending on configuration, the expired state can become unavailable for read 
access
+even if it is not cleaned up yet. In this case it behaves as if it does not 
exist any more.
+
+The collection types of state support TTL on entry level: 
+separate list elements and map entries expire independently. 
 
 Review comment:
   The state collection types support per-entry TTLs: list elements and map 
entries expire independently.

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