IBM InfoSphere Streams Version 4.1.0

Stream debugging based on operator ports

The Streams Debugger provides a port-centric view into the streams processing application.

To set breakpoints, and trace points and to inject new tuples into the application's data flow, you must specify a port on which to operate. Each operator in an streams processing application can have zero or more input ports and zero or more output ports. In the command, yousdb specify a particular port by identifying three pieces of information.
  • The name of the operator.
  • The port type: i for input port, o for output port
  • The port index; zero for the first port that is specified in the SPL source, and so forth.

Here is an example of a port specification in an sdb command: CountAllLines o 0

Where CountAllLines is the operator name, o identifies an output port and 0 refers to the first output port defined for the operator.

Parent topic: Debugging with the Streams Debugger