Communication

The data router subtask is responsible for communicating the event to the Z controller event manager subtask, either by XCF, NCF, TCP/IP or by adding directly to the queue when the tracker and Z controller are started in the same address space. This eliminates the need for a separate event-reader function, saves time, and saves I/O operations.

The EWSEQNO value is not used to build a DD name, as happens with the event reader subtask. The event writer uses the EQQEVDS DD name to identify the event data set.

If a connection is lost between a tracker and the Z controller, the event writer continues to record events. When the connection is restored, the event data set is processed from the last event received by the Z controller before the outage.