6.3 Changing the behavior of JP1/AJS3 if a JP1/AJS3 process terminates abnormally
If JP1/AJS3 stops for any reason, it is no longer able to execute jobs, adversely affecting the jobs in a distributed system.
If a process stops because of an error, JP1/AJS3 attempts recovery by automatically restarting the process. If the recovery fails, JP1/AJS3 operates at a reduced level without stopping any processes other than the process that caused the error. For details about automatically restarting a process that has terminated abnormally, see 6.3.1 Restarting an abnormally terminated JP1/AJS3 process.
In the reduced-operation mode, only some functions are available, depending on the running processes.
To display the processes in the JP1/AJS3 service, you can use the jajs_spmd_status command.
For details about the functions of processes, see B. List of Processes in the manual JP1/Automatic Job Management System 3 Troubleshooting.
Because processes of the agent service function (job execution, event jobs and custom event jobs) do not stop when a process of the scheduler service management function stops, the execution of jobs, events jobs and custom event jobs requested by other hosts is still able to continue.
You can also use the jajs_spmd_status command to check whether the JP1/AJS3 service is currently in a reduced-operation mode.
If you specify the -HA option in the jajs_spmd command or if an error occurs in the JP1/AJS3 service on a logical host in a cluster configuration, there is no reduced-operation mode. If any one of the processes for the JP1/AJS3 service displayed by executing the jajs_spmd_status command stops, the entire JP1/AJS3 service will stop.
To detect abnormal condition without causing JP1/AJS3 on a physical host to run in the reduced-operation mode, specify the jajs_spmd command with the -HA option specified and start JP1/AJS3. You can also stop the entire JP1/AJS3 service.
In addition to the above operations, as a method for detecting failures and taking appropriate action, JP1/AJS3 provides a function that issues a JP1 event if JP1/AJS3 detects an abnormal process. You can specify this function beforehand to issue a JP1 event if a process terminates abnormally.
When issuance of JP1 events is enabled, you can use JP1/AJS3 with other programs, such as JP1/IM, to automatically notify users when a JP1 event is issued.
For details about the function that issues a JP1 event when an abnormal process is detected, see the subsequent subsections.