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