Reliability of the service hosted on the platform is ensured by the Reliability Subsystem. It achieves these tasks by managing failover, replicating, and balancing resources across nodes in a cluster.

The replicator logic within this subsystem is responsible for replicating the state across multiple instances of a service. Maintaining consistency between the primary and the secondary replicas in a service deployment is its main task. It interacts with the failover unit and the reconfiguration agent to understand what needs to be replicated.

Any changes in the number of nodes in the cluster trigger the failover manager service. This in turn triggers automatic redistribution of services across the active nodes.

The resource manager plays the part of placing service replicas across different failure domains. It is also responsible for balancing the resources across the available nodes in the cluster while optimizing the load distribution and resource consumption.