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https://issues.apache.org/jira/browse/BEAM-11632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17299730#comment-17299730
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Beam JIRA Bot commented on BEAM-11632:
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> Guardrails around fromTopic (pubsub)
> ------------------------------------
>
> Key: BEAM-11632
> URL: https://issues.apache.org/jira/browse/BEAM-11632
> Project: Beam
> Issue Type: Bug
> Components: io-java-gcp, io-py-gcp
> Reporter: Ahmet Altay
> Priority: P2
>
> Fundamentally, we should strongly discourage the use of ephemeral topics
> (fromTopic() in PubsubIO) in favor of user-created subscriptions. Currently,
> the documentation for fromTopic states this matter-of-factly, without drawing
> attention to the fact that this is almost certainly *not* what the wants:
> {quote}The Beam runner will start reading data published on this topic from
> the time the pipeline is started. Any data published on the topic before the
> pipeline is started will not be read by the runner.{quote}
> Suggestion: We should include an execution warning whenever fromTopic is
> used, as well as update the documentation.
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