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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