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Bull 3.x Migration
Job Ids
All jobs in BullMQ need to have a unique job id. These id is used to store construct a key where the data is stored in Redis and as a pointer to the job as it is being moving around the different states it can be during its lifetime.
By default job ids are generated automatically as an increasing counter, however it is also possible to specify a custom id.
The main reason to be able to specify a custom id is in cases when you want to avoid duplicated jobs. Since ids must be unique, if you add a job with an existing id then that job will just be ignored and not added to the queue at all.
Jobs that are removed from the queue, either manually or when using settings such as removeOnComplete/Failed will not be considered as duplicates meaning that you can add the same job id many times over as long as the previous job has already been removed from the queue.
In order to specify a custom job id just use the jobId option when adding jobs to the queue:
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await myQueue.add('wall', { color: 'pink' }, {
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jobId: customJobId,
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});
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