Adding additional instances at message flow node level

To change the number of threads that a message flow node can use at run time to process messages, you can configure the Additional instances property of an Input node that is included in a message flow or subflow added to a BAR file.

The following figure outlines the configuration properties of a message flow node:

IBM® Integration Bus allocates threads to a message flow as follows:

• By default, one thread is allocated per Input node. The Input node can be defined in the main message flow or within a subflow.
• The default value of the Additional instances property is 0 threads. The maximum value of the Additional instances property is 256 threads.

• All instances defined in the Additional instances property for an Input node are started by IBM Integration Bus as required.
• The number of threads available to process messages when you start a message flow is by default equal to the number of Input nodes plus the number of additional instances configured for each Input node in the BAR file manage section.
• If you have a subflow included in a message flow, you can configure additional instances for each Input node modeled within the subflow. This condition applies whether the subflow is used as the starting node in a message flow, as a middle node in a message flow, or as the last node in a message flow.

To add more threads to process messages by a specific Input node, you must complete the following steps:

1. Open the BAR file that contains the message flow and subflows for which you want to set the Additional instances property. In the Application Development view, identify the project that contains the BAR file, and double-click the file to open it.
2. Set the Additional instances property of the Input node that is included in the BAR file to a value greater than 0 and up to 256.
   Note: If you set the value to a number greater than 256, the BAR file will fail to deploy.
3. Change the Additional instances pool to Use Pool associated with Node.