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From "Kenneth Knowles (JIRA)" <>
Subject [jira] [Resolved] (BEAM-241) Not easy for runners to get late-data dropping
Date Fri, 20 Jan 2017 05:01:26 GMT


Kenneth Knowles resolved BEAM-241.
       Resolution: Fixed
    Fix Version/s: 0.4.0

> Not easy for runners to get late-data dropping
> ----------------------------------------------
>                 Key: BEAM-241
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-core
>            Reporter: Mark Shields
>            Assignee: Kenneth Knowles
>             Fix For: 0.4.0
> Quite by accident realized the Flink runner delegates to GroupAlsoByWindowViaWindowSetDoFn
for GBK, which in turn delegates to ReduceFnRunner. The latter now assumes no messages will
arrive beyond the 'garbage collection' time of their target window(s).
> The Dataflow runner interposes a LateDataDroppingDoFnRunner into the path so as to drop
those too-late messages. That's done (I think) using DoFnRunners.createDefault.
> I don't think the Flink runner does that.
> We need a nice runner-friendly way of dealing with the too-late data.

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