[jira] [Closed] (FLINK-8384) Session Window Assigner with Dynamic Gaps

["Aljoscha Krettek (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-8384?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aljoscha Krettek closed FLINK-8384.
-----------------------------------
    Resolution: Fixed

Implemented on master in
ede4c0751b630503605248e8d22f29977f58624a

> 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
>            Assignee: Dyana Rose
>            Priority: Minor
>             Fix For: 1.5.0
>
>
> *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 function|https://github.com/apache/flink/blob/master/flink-streaming-java/src/main/java/org/apache/flink/streaming/api/windowing/assigners/EventTimeSessionWindows.java#L59] 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 streams.
> (short preliminary discussion: https://lists.apache.org/thread.html/08a011c0039e826343e9be0b1bb4e0000cfc2e12976bc65f8a43ee88@%3Cdev.flink.apache.org%3E)



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