Overview

A user may want to cancel an executing Universal Command job that supports manager and/or network fault tolerance and have both the manager and server processes terminate immediately. Because of fault tolerance, when the manager is terminated, the server side would begin a connection reestablishment protocol and continue to execute. This would allow the started user job to continue running.

When a Universal Command job is cancelled via the z/OS CANCEL command, the job terminates with either of these exit codes:

Exit code S122, if it is cancelled with a dump.
Exit code S222, if it is cancelled without a dump.

Part of the responsibility of a Universal Broker executing on a particular host is to monitor the status of all locally running manager processes on that machine. So, when instructed, that Universal Broker could issue a STOP command to the Universal Command Server process associated with the stopped/ended manager process.

Exit Codes

Through the use of the SERVER_STOP_CONDITIONS configuration option, the Universal Command Manager process notifies the locally running Universal Broker of the exit codes that should cause it to terminate the running Server process. With this option, the user can specify a list of exit codes that should trigger the locally running Universal Broker to issue the STOP command to the manager's Universal Command server-side process.

SERVER_STOP_CONDITIONS can specify a single exit code or a comma-separated list of exit codes. These stop conditions are passed from the manager to the locally running Universal Broker, which store this and other component-specific data about the executing manager component. When this executing Universal Command Manager process is cancelled or stopped, the locally running Universal Broker detects the ending of the manager process and retrieves its process completion information, which includes the exit code of the manager.

The Universal Broker then compares this exit code with the list of exit codes provided by SERVER_STOP_CONDITIONS. If a match is found, and either network fault tolerance or manager fault tolerance is enabled, the Universal Broker will execute a uctl command to STOP the running Universal Command Server component.

Security Token

For security purposes, Universal Agent passes around a security token that is used by the locally running Universal Broker to STOP associated Universal Command Server process.

This security token is generated on a component-by-component basis by the Universal Broker process that starts the Universal Command Server. Upon generation, this token is returned to the Universal Command Manager which, in turn, updates its locally running Universal Broker with this token. The locally running Universal Broker then uses this token with the issued STOP command to cancel the running Universal Command Server process.

When this token is received by the Universal Broker processes with the request to STOP the server component, the Broker authenticates the received token with the stored token for the running Universal Command Server process. When the token is authenticated, the Universal Command Server process is STOPPED.

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