Hi Juho, Could your key type have possibly changed / been modified across the upgrade? Also, from the error trace, it seems like the failing restore is of a window operator. What window type are you using?
That exception is a result of either mismatching key serializers or namespace serializers (i.e. a window serializer), so the above info should help us narrow down the issue here. Cheers, Gordon -- Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/
