Priority

Each job has an integer priority. Arbiter claims lower numbers first. The default is 0. Use a higher number for background work.

-- runs behind default-priority work
job = Arb.defaultJob payload & Arb.setPriority 10

For equal priorities, Arbiter uses insertion order.

Priority applies during a claim. It does not preempt work that is in flight. A new high-priority job waits for an available worker.

In a group, a retrying job remains first until it succeeds or moves to the DLQ. This rule has precedence over the priority of other jobs in that group.

A group is eligible when it has a ready job. Arbiter ranks the group by the lowest priority number in that group, including delayed jobs. A delayed high-priority job therefore increases the rank of its group.