[jira] [Commented] (FLINK-2870) Add support for accumulating/discarding for Event-Time Windows

["Shikhar Bhushan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-2870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15125217#comment-15125217 ] 

Shikhar Bhushan commented on FLINK-2870:
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What is the current behaviour if a late element arrives and what kind of customization is possible?

> Add support for accumulating/discarding for Event-Time Windows
> --------------------------------------------------------------
>
>                 Key: FLINK-2870
>                 URL: https://issues.apache.org/jira/browse/FLINK-2870
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Aljoscha Krettek
>
> This would allow to specify whether windows should be discarded after the trigger fires or kept in the operator if late elements arrive.
> When keeping elements, the user would also have to specify an allowed lateness time after which the window contents are discarded without emitting any further window evaluation result.
> If elements arrive after the allowed lateness they would trigger the window immediately with only the one single element.



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