Repeatable jobs 'every': wrong behavior

[xrip]

When I add a repeatable job with 'every' parameter I expect it runs every X seconds after the job created, but it's run every X seconds since the day started.

Simple test case:

import { Queue, QueueScheduler, Worker } from 'bullmq';

const queueScheduler = new QueueScheduler('Paint1');
const queue = new Queue('Paint1');

console.log(new Date, '- Adding job');

queue.add('cars', { color: 'blue' }, {
    jobId: "every_20_seconds",
    repeat: {
      every: 20 * 1000, 
      limit: 5,
    }
  });

const worker = new Worker('Paint1', async job => {
    console.log(new Date, '- Running job');
});

Actual results:

2020-09-14T16:51:47.555Z - Adding job
2020-09-14T16:52:00.055Z - Running job
2020-09-14T16:52:20.100Z - Running job

Excepted results:

2020-09-14T16:51:47.555Z - Adding job
2020-09-14T16:52:07.055Z - Running job
2020-09-14T16:52:27.100Z - Running job

[manast]

works as designed. This is a distributed queue and we need to execute the jobs in known time points, doing it as you expect will not guarantee unique repetitions when you have several workers processing the queue. More background here: OptimalBits/bull#1239