On Node1, the master service process runs the workflow instance and non-mapping tasks. The master service process dispatches a mapping included in a Mapping task from workflow1 to the worker service process on Node2. The master service process also acts as a worker service process and can optimize and compile mappings. Profile jobs can also run on Node1.
On Node2, the worker service process optimizes and compiles the mapping. The worker service process then communicates with the master compute node on Node3 to dispatch the compiled mapping to a worker compute node. The Data Integration Service dispatches a preview request directly to the worker service process on Node2. The service process creates a DTM instance within a separate DTM process on Node2 to run the preview job. Node2 also serves as a worker compute node and can run compiled mappings.
On Node3, the Service Manager on the master compute node orchestrates requests to run mappings. The master compute node also acts as a worker compute node and runs the mapping from workflow1 in a separate DTM process started within a container.