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From "Jingsong Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (BEAM-1612) Support real Bundle in Flink runner
Date Tue, 04 Apr 2017 16:34:41 GMT

    [ https://issues.apache.org/jira/browse/BEAM-1612?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15955360#comment-15955360
] 

Jingsong Lee commented on BEAM-1612:
------------------------------------

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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