[jira] [Commented] (FLINK-3370) Add an aligned version of the window operator

["Adam J Heller (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-3370?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15485274#comment-15485274 ] 

Adam J Heller commented on FLINK-3370:
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Hi Stephan. Could you explain how adding an aligned version of the window operator enables us to create sliding event time windows that do not replicate data into the different overlapping windows? That's a very exciting proposition, but I can't see how it would work. Thanks.

> Add an aligned version of the window operator
> ---------------------------------------------
>
>                 Key: FLINK-3370
>                 URL: https://issues.apache.org/jira/browse/FLINK-3370
>             Project: Flink
>          Issue Type: Improvement
>          Components: Windowing Operators
>    Affects Versions: 1.0.0
>            Reporter: Stephan Ewen
>            Assignee: Stephan Ewen
>
> The windowing operators currently follow a generic implementation for support of unaligned windows.
> We can gain efficiency by creating a variant that is optimized for aligned windows:
>   - Aligned windows can use aligned triggers, which keep no per-key state
>   - Less trigger state means less checkpointing data
>   - Based on the aligned windows, we can create sliding event time windows that do not replicate data into the different overlapping windows



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