15.2. Cell-specific components and services

The following components are deployed in each Compute cell.

Cell database
Contains most of the information about instances. Used by the global API, the conductor, and the Compute services.
Coordinates database queries and long-running tasks from the global services, and insulates Compute nodes from direct database access.
Message queue
Messaging service used by all services to communicate with each other within the cell and with the global services.