When you enable a Data Integration Service that runs on a grid, one service process starts on each node with the service role in the grid. The Data Integration Service designates one service process as the master service process. The master service process manages application deployments, logging, job requests, and the dispatch of mappings to worker service processes for optimization and compilation. The master service process also acts as a worker service process and can optimize and compile mappings.

The Data Integration Service designates the remaining service processes as worker service processes. When a worker service process starts, it registers itself with the master service process so that the master is aware of the worker. A worker service process optimizes and compiles mappings, and then generates a grid task. A grid task is a job request sent by the worker service process to the Service Manager on the master compute node.

Communicates with the Resource Manager Service to manage the grid of available compute nodes. When the Service Manager on a node with the compute role starts, the Service Manager registers the node with the Resource Manager Service.
Orchestrates worker service process requests and dispatches mappings to worker compute nodes.