Scheduler

The Scheduler is an internal process managed by the HVR Hub Server. It manages jobs and job groups for each channel and job types. All jobs and job groups are contained within the SYSTEM job group.

The jobs are generated using commands hvractivate, hvrrefresh and hvrcompare or from the corresponding Activate Replication, Refresh Data, and Compare Data dialogs in the User Interface. After they are generated, these jobs can be controlled by attributes defined by the jobs themselves and on the job groups to which they belong. These attributes control when the jobs get scheduled.

Job States

The Scheduler schedules jobs. Each job performs a certain task. At any moment a job is in a certain state. For instance, when a job is waiting to be run, it is in state PENDING; when a job is running, it is in state RUNNING.

Jobs can be either acyclic or cyclic. Acyclic jobs will only run once, whereas cyclic jobs will rerun repeatedly. When a cyclic job runs, it goes from state PENDING to RUNNING and then back to state PENDING. In this state, it waits to receive a signal (trigger) in order to run again. When an acyclic job runs, it goes from state PENDING to RUNNING and then disappears.

If for some reason a job fails to run successfully, the Scheduler will change its state first to ALERTING, then RETRY and will eventually run again. If a job stays in state RUNNING for too long, it may be marked with state HANGING; if it finishes successfully it will just become PENDING.

For more information about HVR jobs and their states, see Jobs section.