Concurrency vs Sandboxed vs Normal

[notflip]

I can't seem to wrap my head around these concepts, could someone explain to me what the difference is between these options?

• Using no (0) concurrency setting (does this mean every job is processed on the main thread?)
• Using only concurrency setting
• Sandboxed without concurrency setting
• Sandboxed with concurrency setting

What if I have 2 queues and their workers, without sandboxing or concurrency, will these block each other from processing?

export const parseQueue = new Queue('parse', { connection });
export const parseWorker = new Worker('parse', async (job) => {});

export const planQueue = new Queue('plan', { connection });
export const planWorker = new Worker('plan', async (job) => {});

[manast]

The concurrency setting sets the number of jobs that can be processed in parallel by a given worker. It does not matter if the worker runs in a sandbox or in the main thread, it is the same concept.

[manast]

Btw, "without concurrency setting" is concurrency 1, the defaul.