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https://issues.apache.org/jira/browse/BEAM-4532?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17547292#comment-17547292
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Kenneth Knowles commented on BEAM-4532:
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This issue has been migrated to https://github.com/apache/beam/issues/19060
> Consider how to free state with unbounded keys in the global window
> -------------------------------------------------------------------
>
> Key: BEAM-4532
> URL: https://issues.apache.org/jira/browse/BEAM-4532
> Project: Beam
> Issue Type: New Feature
> Components: beam-model, sdk-java-core, sdk-py-core
> Reporter: Kenneth Knowles
> Priority: P3
> Labels: Clarified
>
> Currently, state is per-key-and-window and is freed by window expiration.
> In the global window, state never expires. It can be explicitly deleted by
> the user based on timers or custom criteria, but that might be a pain.
> [~reuvenlax] suggests a nicer API or model might be helpful.
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