Hi everyone, I read the Flink 1.8 release notes about state [1], and it said
*Continuous incremental cleanup of old Keyed State with TTL* > We introduced TTL (time-to-live) for Keyed state in Flink 1.6 (FLINK-9510 > <https://issues.apache.org/jira/browse/FLINK-9510>). This feature allowed > to clean up and make inaccessible keyed state entries when accessing them. > In addition state would now also being cleaned up when writing a > savepoint/checkpoint. > Flink 1.8 introduces continous cleanup of old entries for both the RocksDB > state backend (FLINK-10471 > <https://issues.apache.org/jira/browse/FLINK-10471>) and the heap state > backend (FLINK-10473 <https://issues.apache.org/jira/browse/FLINK-10473>). > This means that old entries (according to the ttl setting) are continously > being cleanup up. I'm not familiar with TTL's implementation in Flink 1.6 and what new features introduced in Flink 1.8. I don't understand what difference between these two release version after reading the release notes. Did they change the outcome of TTL feature, or provide new TTL features, or just change the behavior of executing TTL mechanism. Could you give me more references to learn about it? A simple example to illustrate it is more appreciated. Thank you. Best, Tony Wei [1] https://ci.apache.org/projects/flink/flink-docs-master/release-notes/flink-1.8.html#state
