Can you elaborate on the intra- inter-* latencies your are seeing? for AZ independent services this should single digits.

When I'm balancing a single deployment across multiple AZs (e.g. US-East -> US-West), the latencies between the containers seem far higher than just the 200-300ms predicted by speed of light. Am I doing something wrong?

No mesos under the hood. You can bring mesos as your own scheduler.

Thanks again - this is really helpful. I had talked to someone who had left Amazon but knew the internal workings who said ECS was Mesos just privately branded like Chef -> OpsWorks, but I guess I must have misunderstood.

Thanks for clarifying!