Consider how to free state with unbounded keys in the global window
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beam-model
core
java
new feature
P3
python
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Description
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.
Imported from Jira [BEAM-4532](https://issues.apache.org/jira/browse/BEAM-4532). Original Jira may contain additional context.
Reported by: kenn.
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