When a worker crashes, a monitoring process runs the handle_failure/3 function from the selected module on the queue's node. Honeydew ships with two failure modes, at present:
- Abandon - Simply forgets about the job.
- Move - Removes the job from the original queue, and places it on another.
- Retry - Re-attempts the job on its original queue a number of times, then calls another failure mode after the final failure.
See Honeydew.start_queue/3 to select a failure mode.
When a job completes successfully, the monitoring process runs the handle_success/2 function from the selected module on the queue's node. You'll likely want to use this callback for monitoring purposes. You can use a job's :enqueued_at, :started_at and :completed_at fields to calculate various time intervals.
See Honeydew.start_queue/3 to select a success mode.