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From "Aljoscha Krettek (JIRA)" <>
Subject [jira] [Created] (BEAM-1517) Garbage collect user state in Flink Runner
Date Tue, 21 Feb 2017 09:02:44 GMT
Aljoscha Krettek created BEAM-1517:

             Summary: Garbage collect user state in Flink Runner
                 Key: BEAM-1517
             Project: Beam
          Issue Type: Bug
          Components: runner-flink
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek

User facing state/timers in Beam are bound to the key/window of the data. Right now, the Flink
Runner does not clean up user state when the watermark passes the GC horizon for the state
associated with a given window.

Neither {{StateInternals}} nor the Flink state API support discarding state for a whole namespace
(which is the window in this case) so we might have to manually set a GC timer for each window/key
combination, as is done in the {{ReduceFnRunner}}. For this we have to know all states a user
can possibly use, which we can get from the {{DoFn}} signature.

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