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From "Aljoscha Krettek (JIRA)" <>
Subject [jira] [Updated] (BEAM-1517) Garbage collect user state in Flink Runner
Date Tue, 28 Feb 2017 17:21:45 GMT


Aljoscha Krettek updated BEAM-1517:
    Fix Version/s: 0.6.0

> Garbage collect user state in Flink Runner
> ------------------------------------------
>                 Key: BEAM-1517
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-flink
>    Affects Versions: 0.6.0
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>             Fix For: 0.6.0
> 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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