Table of Contents

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  1. Preface
  2. Analyst Service
  3. Content Management Service
  4. Data Integration Service
  5. Data Integration Service Architecture
  6. Data Integration Service Management
  7. Data Integration Service Grid
  8. Data Integration Service Applications
  9. Metadata Manager Service
  10. Model Repository Service
  11. PowerCenter Integration Service
  12. PowerCenter Integration Service Architecture
  13. High Availability for the PowerCenter Integration Service
  14. PowerCenter Repository Service
  15. PowerCenter Repository Management
  16. PowerExchange Listener Service
  17. PowerExchange Logger Service
  18. SAP BW Service
  19. Search Service
  20. System Services
  21. Test Data Manager Service
  22. Web Services Hub
  23. Application Service Upgrade
  24. Application Service Databases
  25. Connecting to Databases from Windows
  26. Connecting to Databases from UNIX
  27. Updating the DynamicSections Parameter of a DB2 Database

Workflow on a Grid

Workflow on a Grid

When you run a workflow on a grid, the PowerCenter Integration Service designates one service process as the master service process, and the service processes on other nodes as worker service processes. The master service process can run on any node in the grid.
The master service process receives requests, runs the workflow and workflow tasks including the Scheduler, and communicates with worker service processes on other nodes. Because it runs on the master service process node, the Scheduler uses the date and time for the master service process node to start scheduled workflows. The master service process also runs the Load Balancer, which dispatches tasks to nodes in the grid.
Worker service processes running on other nodes act as Load Balancer agents. The worker service process runs predefined Event-Wait tasks within its process. It starts a process to run Command tasks and a DTM process to run Session tasks.
The master service process can also act as a worker service process. So the Load Balancer can distribute Session, Command, and predefined Event-Wait tasks to the node that runs the master service process or to other nodes.
For example, you have a workflow that contains two Session tasks, a Command task, and a predefined Event-Wait task.
The following figure shows an example of service process distribution when you run the workflow on a grid with three nodes:
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When you run the workflow on a grid, the PowerCenter Integration Service process distributes the tasks in the following way:
  • On Node 1, the master service process starts the workflow and runs workflow tasks other than the Session, Command, and predefined Event-Wait tasks. The Load Balancer dispatches the Session, Command, and predefined Event-Wait tasks to other nodes.
  • On Node 2, the worker service process starts a process to run a Command task and starts a DTM process to run Session task 1.
  • On Node 3, the worker service process runs a predefined Event-Wait task and starts a DTM process to run Session task 2.