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https://issues.apache.org/jira/browse/BEAM-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955360#comment-15955360
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Jingsong Lee commented on BEAM-1612:
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I think this is a good idea. No matter how small it is better than one bundle
by one record.
Flink default buffer size is 32768 bytes and default BufferTimeout is 100ms.
([~aljoscha] Please point out if there is something wrong)
According to my production experience, I think 2M is a more reasonable
bundleSize. I have not changed the BufferSize in Flink. [~aljoscha] Can Flink
work well with 2M BufferSize?
> 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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