I modified typesafe's activator-akka-cluster-sharding-scala exampl 
<https://github.com/typesafehub/activator-akka-cluster-sharding-scala>e:

https://gist.github.com/jgrowl/028e621d32f2388e876a

Basically I have a Publisher node which has an accompanying redis node that 
watches for messages and then will send it to the publisher. Likewise there 
is a Subscriber that also has a redis watcher.

My code can send messages to my publisherRegion but messages sent to 
subscriberRegion never reach the intended target. I never get any errors, 
the messages just go in silently. What seems to be happening is that 
messages are going into the shardBuffers but a receiveCoordinatorMessage is 
never sent so the messages stay there forever.

If I comment out the publisher node and run the subscriber node (with its 
redis node) then the subscriber works fine in isolation. When using them 
together though only one will receive messages.

I am not sure if what I am trying to do is just outside of the realm of 
expected use cases, if there is a bug somewhere, or if I am just doing 
something wrong.

Any ideas?

Thanks,
Jon

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