Hi Mikael,
> > Failed to read key hello, org.mkhq.kafka.Topology$StoreUnavailable > > Failed to read key hello, org.mkhq.kafka.Topology$KeyNotFound > > hello -> 10 > > The case where you get KeyNotFound looks like a bug to me. This shouldn't happen. I can see why it might happen and we will create a JIRA and fix it right away. I'm not sure how you end up with (hello -> 10). It could indicate that the offsets for the topic you are consuming from weren't committed so the data gets processed again on the restart. Thanks, Damian