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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3714) Add Support for "Allowed Lateness"
Date Wed, 15 Jun 2016 13:09:09 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3714?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15331704#comment-15331704

ASF GitHub Bot commented on FLINK-3714:

Github user aljoscha commented on the issue:

    The changes look very good now! The refactoring of the cleanup and firing makes it very
easy to see what's going on. I just had some inline comments about outdated Javadoc and exception
    I still have to read the tests in depth, I'm doing that now.

> Add Support for "Allowed Lateness"
> ----------------------------------
>                 Key: FLINK-3714
>                 URL: https://issues.apache.org/jira/browse/FLINK-3714
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Streaming
>            Reporter: Aljoscha Krettek
>            Assignee: Kostas Kloudas
> As mentioned in https://docs.google.com/document/d/1Xp-YBf87vLTduYSivgqWVEMjYUmkA-hyb4muX3KRl08/edit#
we should add support for an allowed lateness setting.
> This includes several things:
>  - API for setting allowed lateness
>  - Dropping of late elements 
>  - Garbage collection of windows state/timers
> Depending on whether the {{WindowAssigner}} assigns windows based on event time or processing
time we have to adjust the GC behavior. For event-time windows "allowed lateness" makes sense
and we should garbage collect after this expires. For processing-time windows "allowed lateness"
does not make sense and we should always GC window state/timers at the end timestamp of a
processing-time window. I think that we need a method for this on {{WindowAssigner}} that
allows to differentiate between event-time windows and processing-time windows: {{boolean

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