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https://issues.apache.org/jira/browse/BEAM-8582?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sam Rohde closed BEAM-8582.
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> Python SDK emits duplicate records for Default and AfterWatermark triggers
> --------------------------------------------------------------------------
>
> Key: BEAM-8582
> URL: https://issues.apache.org/jira/browse/BEAM-8582
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Sam Rohde
> Assignee: Sam Rohde
> Priority: Major
> Fix For: 2.19.0
>
>
> This was found after fixing https://issues.apache.org/jira/browse/BEAM-8581.
> The fix for 8581 was to pass in the input watermark. Previously, it was using
> MIN_TIMESTAMP for all of its EOW calculations. By giving it a proper input
> watermark, this bug started to manifest.
> The DefaultTrigger and AfterWatermark do not clear their timers after the
> watermark passed the end of the endow, leading to duplicate records being
> emitted.
> Fix: Clear the watermark timer when the watermark reaches the end of the
> window.
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