[jira] [Updated] (FLINK-3581) Add Special Aligned Event-Time WindowOperator

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-3581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek updated FLINK-3581:
------------------------------------
    Component/s:     (was: Streaming)
                 DataStream API

> Add Special Aligned Event-Time WindowOperator
> ---------------------------------------------
>
>                 Key: FLINK-3581
>                 URL: https://issues.apache.org/jira/browse/FLINK-3581
>             Project: Flink
>          Issue Type: Improvement
>          Components: DataStream API
>            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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