CROSS-DATA-STORE OPERATIONS IN LOG-COORDINATED STORAGE SYSTEMS

Data stores that are to be configured as members of a storage group on behalf of a client are identified. The client indicates one or more types of cross-data-store operations to be performed. A transaction manager that makes acceptance decisions for write requests directed to the members based at least partly on contents of a log is instantiated, and respective write transformers are set up for at least some of the types of cross-data-store operations. During a particular time period, the workload at the storage group is monitored, and the number and types of cross-data-store operations is determined. The results of the monitoring are used to determine a billing amount for the client based on a selected pricing policy.