Hello everyone,

I'm starting with Akka Streams and so far everything is going well. 
However, I have met with a use case that I don't know how to approach. The 
scenario is a stream with an ActorPublisher as a source that is consuming 
messages from Kafka and a subscriber as a sink that updates a Cassandra 
table.

Kafka ~> some mapping operations ~> Cassandra

The point is that I'd like to explicitly confirm to Kafka every time a 
message has been successfully processed and inserted into Cassandra so that 
I could re-read the message in case a disaster happens and the service 
fails, i.e. some kind of at least once delivery behaviour. How could I 
approach this in terms of Akka Streams?. Is a supported scenario?.

It's true that I always can configure the Kafka consumer with auto-commit 
behaviour but I'd rather take control of how I'm reading the messages.

Thanks in advance for your help.

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