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Posted to issues@flink.apache.org by "Elias Levy (JIRA)" <ji...@apache.org> on 2019/02/01 20:25:01 UTC
[jira] [Created] (FLINK-11520) Triggers should be provided the
window state
Elias Levy created FLINK-11520:
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Summary: Triggers should be provided the window state
Key: FLINK-11520
URL: https://issues.apache.org/jira/browse/FLINK-11520
Project: Flink
Issue Type: Improvement
Reporter: Elias Levy
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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