[jira] [Commented] (BEAM-2421) Migrate Dataflow 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=16041588#comment-16041588 ] 

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

Github user asfgit closed the pull request at:

    https://github.com/apache/beam/pull/3312


> Migrate Dataflow 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-fn-api, beam-model-runner-api, runner-dataflow
>            Reporter: Luke Cwik
>
> 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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