Can you describe deployment strategies such as rolling updates, blue-green, and canary deployments, and how they can be implemented in an Akka Cluster?
In Akka Cluster, deployment strategies like rolling updates, blue-green, and canary deployments help maintain system availability during upgrades or changes.
1. Rolling Updates : Nodes are updated incrementally, ensuring minimal downtime. In Akka Cluster, use cluster-aware routers to redirect traffic away from updating nodes. Implement graceful shutdowns using CoordinatedShutdown for safe removal of nodes.
2. Blue-Green Deployments : Two environments (blue and green) run concurrently with identical configurations. One serves live traffic while the other is updated. In Akka Cluster, switch between environments by adjusting routing rules in load balancers or DNS settings.
3. Canary Deployments : A small portion of the cluster runs the new version alongside the majority running the old version. Monitor performance and gradually increase the new version’s presence if successful. In Akka Cluster, create separate node groups with different versions and adjust router configuration to control traffic distribution.
