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