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https://issues.apache.org/jira/browse/FLINK-11520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Metzger updated FLINK-11520:
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Component/s: Runtime / Operators
> Triggers should be provided the window state
> --------------------------------------------
>
> Key: FLINK-11520
> URL: https://issues.apache.org/jira/browse/FLINK-11520
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Operators
> Reporter: Elias Levy
> Priority: Major
>
> Some triggers may require access to the window state to perform their job.
> Consider a window computing a count using an aggregate function. It may be
> desired to fire the window when the count is 1 and then at the end of the
> window. The early firing can provide feedback to external systems that a key
> has been observed, while waiting for the final count.
> The same problem can be observed in
> org.apache.flink.streaming.api.windowing.triggers.CountTrigger, which must
> maintain an internal count instead of being able to make use of the window
> state.
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