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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-8384) Session Window Assigner with Dynamic Gaps
Date Sun, 04 Feb 2018 16:47:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-8384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351836#comment-16351836

ASF GitHub Bot commented on FLINK-8384:

Github user dyanarose commented on the issue:

    the change to return Time has been backed out, so extract returns a long again.
    PublicEvolving annotations have been added to the new classes and methods.

> Session Window Assigner with Dynamic Gaps
> -----------------------------------------
>                 Key: FLINK-8384
>                 URL: https://issues.apache.org/jira/browse/FLINK-8384
>             Project: Flink
>          Issue Type: Improvement
>          Components: Streaming
>            Reporter: Dyana Rose
>            Priority: Minor
> *Reason for Improvement*
> Currently both Session Window assigners only allow a static inactivity gap. 
> Given the following scenario, this is too restrictive:
> * Given a stream of IoT events from many device types
> * Assume each device type could have a different inactivity gap
> * Assume each device type gap could change while sessions are in flight
> By allowing dynamic inactivity gaps, the correct gap can be determined in the [assignWindows
by passing the element currently under consideration, the timestamp, and the context to a
user defined function. This eliminates the need to create unwieldy work arounds if you only
have static gaps.
> Dynamic Session Window gaps should be available for both Event Time and Processing Time
> (short preliminary discussion: https://lists.apache.org/thread.html/08a011c0039e826343e9be0b1bb4e0000cfc2e12976bc65f8a43ee88@%3Cdev.flink.apache.org%3E)

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