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https://issues.apache.org/jira/browse/BEAM-13213?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Bradshaw updated BEAM-13213:
-----------------------------------
Priority: P0 (was: P2)
> OnWindowExpiration does not work without other state
> ----------------------------------------------------
>
> Key: BEAM-13213
> URL: https://issues.apache.org/jira/browse/BEAM-13213
> Project: Beam
> Issue Type: Bug
> Components: sdk-java-core
> Reporter: Lara Schmidt
> Assignee: Emily Ye
> Priority: P0
> Fix For: 2.36.0
>
>
> OnWindowExpiration requires that a DoFn be marked as using state/timers.
> However OnWindowExpiration does not actually mark that a DoFn needs
> state/timers. Therefore if you do not have any other state/timers in the
> DoFn, OnWindowExpiration is just never called.
> Likely not noticed as it was intended as a way to clean up state at the end
> of the window - but it's not guaranteed this is the case.
> Here's the relevant functions which should probably take into account if this
> function exists. Note these aren't consistent either - so not sure which is
> used in which case.
> [https://github.com/apache/beam/blob/6c954ca7106e67c0834b0e74926c376f02d5f811/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/reflect/DoFnSignatures.java#L2497]
> [https://github.com/apache/beam/blob/6c954ca7106e67c0834b0e74926c376f02d5f811/sdks/java/core/src/main/java/org/apache/beam/sdk/transforms/reflect/DoFnSignature.java#L141]
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