Niels Basjes created FLINK-3089:
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Summary: OperatorState timeout
Key: FLINK-3089
URL: https://issues.apache.org/jira/browse/FLINK-3089
Project: Flink
Issue Type: New Feature
Reporter: Niels Basjes
In some usecases (webanalytics) there is a need to have a state per visitor on
a website (i.e. keyBy(sessionid) ).
At some point the visitor simply leaves and no longer creates new events (so a
special 'end of session' event will not occur).
The only way to determine that a visitor has left is by choosing a timeout,
like "After 30 minutes no events we consider the visitor 'gone'".
Only after this (chosen) timeout has expired should we discard this state.
In the Trigger part of Windows we can set a timer and close/discard this kind
of information. But that introduces the buffering effect of the window (which
in some scenarios is unwanted).
What I would like is to be able to set a timeout on a specific OperatorState
value which I can update afterwards.
This makes it possible to create a map function that assigns the right value
and that discards the state automatically.
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