Bull: Builtin backoff strategies not explained in documentation

[sundowndev]

Description

Builtin backoff strategies "fixed" and "exponential" are mentioned in the docs but not explained, what those strategies are doing ? Can it be combined with attempts option ?

Thanks

[manast]

yes attempts can be used with backoff strategies.

[sundowndev]

Builtin backoff strategies "fixed" and "exponential" are mentioned in the docs but not explained, what those strategies are doing ?

[tnolet]

Trying to figure out too how backoff's work. They do not seem to do anything.
The code below just does two attempts right after each other. No backoff.

 queue.add({ data }, {
    timeout: 10000,
    attempts: 2,
    removeOnComplete: true,
    removeOnFail: true,
    backoff: {
      type: 'fixed',
      delay: 5000 // ms
    }
  })

[manast]

Until the documentation is up to date I recommend you to check the tests for reference: https://github.com/taskforcesh/bullmq/blob/master/src/test/test_worker.ts#L1058

[sundowndev]

@tnolet I currently use fixed backoff with delay in production and it works well:

queue.add({ data }, { attempts: 5, backoff: { type: 'fixed', delay: 30000, // 30s } })

5 attempts with 30sec between each try. I still don't know what's the difference between fixed and exponential tho.

[mythio]

Suppose your worker throws error, and the job fails, does removeOnFail: false, keep the job in the queue?
I have

queue.add({ data }, {
    removeOnComplete: true,
    removeOnFail: false,
  })

It removes the jobs whatsoever.

[manast]

@mythio please do not ask unrelated questions in the issues. You have already asked the same thing in three different places.