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Posted to issues@beam.apache.org by "Ahmet Altay (Jira)" <ji...@apache.org> on 2021/01/13 00:53:00 UTC

[jira] [Created] (BEAM-11632) Guardrails around fromTopic (pubsub)

Ahmet Altay created BEAM-11632:
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             Summary: 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
            Assignee: Chamikara Madhusanka Jayalath


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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