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[jira] [Created] (FLINK-9491) Implement timer service based on RocksDB

Stefan Richter created FLINK-9491:

             Summary: Implement timer service based on RocksDB
                 Key: FLINK-9491
                 URL: https://issues.apache.org/jira/browse/FLINK-9491
             Project: Flink
          Issue Type: Sub-task
          Components: State Backends, Checkpointing
            Reporter: Stefan Richter
            Assignee: Stefan Richter
             Fix For: 1.6.0

We can now implement timer state that is stored in RocksDB for users that run the {{RocksDBKeyedStateBackend}}. As explained in the design document (https://docs.google.com/document/d/1XbhJRbig5c5Ftd77d0mKND1bePyTC26Pz04EvxdA7Jc/edit#heading=h.17v0k3363r6q) this should also give us asynchronous and incremental snapshots for timer state that is larger than main memory.

We need to think about a way in which to user can select either to run timers on RocksDB or on the heap when using the {{RocksDBKeyedStateBackend}}.

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