Aljoscha Krettek created BEAM-1517:
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Summary: Garbage collect user state in Flink Runner
Key: BEAM-1517
URL: https://issues.apache.org/jira/browse/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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