Hi Aljoscha,

thanks for your reply.
It seems like 1.2 will be a very awesome release.
I’m looking forward to it :)

Best Regards,

Von: Aljoscha Krettek [mailto:aljos...@apache.org]
Gesendet: Donnerstag, 1. Dezember 2016 12:41
An: user@flink.apache.org
Betreff: Re: Time To Live-Setting for State/StateDescriptor

Hi Julian,
we're aware of the issue (https://issues.apache.org/jira/browse/FLINK-3946) but 
unfortunately it's not implemented yet. I recently added ProcessFunction which 
is somewhat similar to a flatmap but also allows setting timers. This can be 
used to set a TTL timer and then call clear() on the state when the timer 
fires. This will be release in Flink 1.2.


On Wed, 30 Nov 2016 at 17:13 Julian Bauß 
<julian.ba...@gmail.com<mailto:julian.ba...@gmail.com>> wrote:
Hi everybody,

does Flink offer any automated TTL-functionality for operator state?
My current solution for deleting state after some time is using a SessionWindow 
which triggers after a timeout and sends messages to stateful operators which 
then call the clear() method on their state.

This is my solution in pseudocode:

sessionEndNotifications = 

          .flatMap(new StatefulFlatMapFunction())

The StatefulFlatMapFunction calls state.clear() in its flatMap2 function when 
it receives a sessionEndNotification. The flatMap1 function contains the actual 
business logic which is being calculated per event.

I feel like I'm doing this in a roundabout way. Are there better ways of doing 

Best Regards,



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