Lara Schmidt created BEAM-13213:
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Summary: 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: Lara Schmidt
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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