![]() You can specify the default move cost for a service when it is created: Some are likely to be much more expensive. But as with default or static loads, it's unlikely in any complex system that all moves are equal. ![]() If two solutions are generated with about the same balance (score), then the Cluster Resource Manager prefers the one with the lowest cost (total number of moves). The first mechanism is simply counting every move that it would make. The Cluster Resource Manager has two ways of computing costs and limiting them while it tries to manage the cluster. However, you also don’t want to ignore solutions that would significantly improve the allocation of resources in the cluster. Minimizing the cost of solutions that the Azure Service Fabric Cluster Resource Manager comes up with helps ensure that the cluster's resources aren't spent unnecessarily. For stateful services, it requires copying the state of those services, consuming additional memory and disk. Moving services costs CPU time and network bandwidth at a minimum. The goal is to meet the requirements in the least disruptive or expensive way. Cost is factored in when moving services for balancing, defragmentation, and other requirements. The notion of "cost" is traded off against how much the cluster can be improved. A factor that the Service Fabric Cluster Resource Manager considers when trying to determine what changes to make to a cluster is the cost of those changes.
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