Dyana Rose created FLINK-8384:
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Summary: 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
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.
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