[jira] [Assigned] (BEAM-1612) Support real Bundle in Flink runner

["Jingsong Lee (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jingsong Lee reassigned BEAM-1612:
----------------------------------

    Assignee: Jingsong Lee

> Support real Bundle in Flink runner
> -----------------------------------
>
>                 Key: BEAM-1612
>                 URL: https://issues.apache.org/jira/browse/BEAM-1612
>             Project: Beam
>          Issue Type: Improvement
>          Components: runner-flink
>            Reporter: Jingsong Lee
>            Assignee: Jingsong Lee
>
> The Bundle is very important in the beam model. Users can use the bundle to flush buffer, can reuse many heavyweight resources in a bundle. Most IO plugins use the bundle to flush. 
> Moreover, FlinkRunner can also use Bundle to reduce access to the FlinkState, such as first placed in JavaHeap, flush into RocksDbState when invoke finishBundle , this can reduce the number of serialization.
> But now FlinkRunner calls the finishBundle every processElement. We need support real Bundle.
> I think we can have the following implementations:
> 1.Invoke finishBundle and next startBundle in {{snapshot}} of Flink. But sometimes this "Bundle" maybe too big. This depends on the user's checkpoint configuration.
> 2.Manually control the size of the bundle. The half-bundle will be flushed to a full-bundle by count or eventTime or processTime or {{snapshot}}. We do not need to wait, just call the startBundle and finishBundle at the right time.



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