Retries and cancellation

Retries

Every kind gets MaxAttempts (default 10) and a Backoff that computes the delay before the next attempt from the attempt number and the error. kiln.Exponential, kiln.Constant and kiln.Delays cover the common cases; a handler can also return kiln.Permanent(err) to fail without retrying, or kiln.Snooze(d) to reschedule itself without counting as a failure. A failed job that you requeue gets all of its attempts again. Make the retries outlast the longest outage of what a job calls, and alert on what fails anyway: see Retries and alerts.

Cancellation

client.Delete on a job that is currently processing cancels that job's context.Context on whichever server is running it, with kiln.ErrCanceled as the cause (context.Cause(ctx)). A handler that stops and returns an error is recorded as deleted.