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Posted to commits@beam.apache.org by "Aljoscha Krettek (JIRA)" <ji...@apache.org> on 2017/03/01 17:02:45 UTC

[jira] [Closed] (BEAM-1517) Garbage collect user state in Flink Runner

     [ https://issues.apache.org/jira/browse/BEAM-1517?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek closed BEAM-1517.
----------------------------------
    Resolution: Fixed
      Assignee: Jingsong Lee  (was: Aljoscha Krettek)

> 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
>    Affects Versions: 0.6.0
>            Reporter: Aljoscha Krettek
>            Assignee: Jingsong Lee
>            Priority: Blocker
>             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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