[jira] [Commented] (BEAM-2421) Migrate Apache Beam to use impulse primitive as the only root primitive

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/BEAM-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16282918#comment-16282918 ] 

ASF GitHub Bot commented on BEAM-2421:
--------------------------------------

jkff opened a new pull request #4234: [BEAM-2421] Replaces BoundedSource with a composite transform when using Fn API
URL: https://github.com/apache/beam/pull/4234
 
 
   https://issues.apache.org/jira/browse/BEAM-2421

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> 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
>            Assignee: Eugene Kirpichov
>              Labels: portability
>
> 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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