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https://issues.apache.org/jira/browse/BEAM-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16448782#comment-16448782
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Ben Sidhom commented on BEAM-2421:
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[https://github.com/apache/beam/pull/4783] adds support for the Flink batch
runner.
> Migrate Apache Beam to use impulse primitive as the only root primitive
> -----------------------------------------------------------------------
>
> Key: BEAM-2421
> URL: https://issues.apache.org/jira/browse/BEAM-2421
> Project: Beam
> Issue Type: Improvement
> Components: beam-model
> Reporter: Luke Cwik
> Priority: Major
> Labels: portability
> Time Spent: 4.5h
> Remaining Estimate: 0h
>
> The impulse source emits a single byte array element within the global window.
> This is in preparation for using SDF as the replacement for different bounded
> and unbounded source implementations.
> Before:
> Read(Source) -> ParDo -> ...
> Impulse -> SDF(Source) -> ParDo -> ...
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