[jira] [Created] (FLINK-3581) Add Non-Keyed Window Trigger

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-3581:
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             Summary: Add Non-Keyed Window Trigger
                 Key: FLINK-3581
                 URL: https://issues.apache.org/jira/browse/FLINK-3581
             Project: Flink
          Issue Type: Improvement
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek


The current Window Trigger is per key. Meaning every window has a (logical) Trigger for every key in the window, i.e. there will be state and time triggers per key per window.

For some types of windows, i.e. based on time it is possible to use a single Trigger to fire for all keys at the same time. In that case we would save a lot of space on state and timers. Which makes state snapshots a lot smaller.



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