Greetings @Paul Codding, it has been a few years since activity on this thread and our team is wondering if it is still the case that Hortonworks does not recommend spanning multiple availability zones to implement Hadoop high availability in AWS? In a recent post on the subject @fschneider replied "that in case of HA clusters the HA nodes should be launched in different availabilty zones". https://community.hortonworks.com/questions/176198/will-single-availability-zone-provide-high-availab.html Other vendors are recommending a deployment methodology that spans AWS availability zones while also noting data transfer costs, network latency and throughput considerations. Many thanks in advance! ... View more