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https://issues.apache.org/jira/browse/BEAM-3859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547069#comment-17547069
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Kenneth Knowles commented on BEAM-3859:
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This issue has been migrated to https://github.com/apache/beam/issues/18858
> Add an override to read from an Unbounded Source via Impulse and ParDo
> ----------------------------------------------------------------------
>
> Key: BEAM-3859
> URL: https://issues.apache.org/jira/browse/BEAM-3859
> Project: Beam
> Issue Type: Bug
> Components: runner-core
> Reporter: Thomas Groh
> Priority: P3
>
> This enables more movement towards BEAM-2421.
>
> The DoFn that implements an UnboundedRead will have to be performed by a
> Splittable DoFn, as otherwise a reader can (and likely will) produce
> unbounded output per split, and cannot properly hold watermarks.
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