Higher level Cluster tools
Cluster Singleton
For some use cases it is convenient or necessary to ensure only one actor of a certain type is running somewhere in the cluster. This can be implemented by subscribing to member events, but there are several corner cases to consider. Therefore, this specific use case is covered by the Cluster Singleton.
See Cluster Singleton.
Cluster Sharding
Distributes actors across several nodes in the cluster and supports interaction with the actors using their logical identifier, but without having to care about their physical location in the cluster.
See Cluster Sharding.
Distributed Data
Distributed Data is useful when you need to share data between nodes in an Akka Cluster. The data is accessed with an actor providing a key-value store like API.
See Distributed Data.
Distributed Publish Subscribe
Publish-subscribe messaging between actors in the cluster based on a topic, i.e. the sender does not have to know on which node the destination actor is running.
See Cluster Distributed Publish Subscribe.
Cluster Aware Routers
All routers can be made aware of member nodes in the cluster, i.e. deploying new routees or looking up routees on nodes in the cluster. When a node becomes unreachable or leaves the cluster the routees of that node are automatically unregistered from the router. When new nodes join the cluster, additional routees are added to the router, according to the configuration.
See Cluster Aware Routers and Routers.
Cluster across multiple data centers
Akka Cluster can be used across multiple data centers, availability zones or regions, so that one Cluster can span multiple data centers and still be tolerant to network partitions.
See Cluster Multi-DC.
Cluster Client
Communication from an actor system that is not part of the cluster to actors running somewhere in the cluster. The client does not have to know on which node the destination actor is running.
See Cluster Client.
Cluster Metrics
The member nodes of the cluster can collect system health metrics and publish that to other cluster nodes and to the registered subscribers on the system event bus.
See Cluster Metrics.
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