r2dbc-postgresql VS pg-boss

Now that we have an application, let's turn it into a reactive application. For this, we will replace Spring Web dependency with Spring WebFlux, Spring Data JPA with Spring Data R2DBC. We will also add R2DBC dependency for our H2 database. R2DBC works with a reactive driver so it will integrate nicely with the rest of our application to allow us database access in a non-blocking way.

However, if you really expect a lot of users (especially concurrent ones) to use your API, you should delve into the world of reactive programming. Use tools like RxJS (JS/TS) or Project Reactor (Java) in such a case, preferably in combination with a broker like Kafka or RabbitMQ. R2DBC is also great for a data store. Then of course if you want to go one step further, there also exists the less popular but very interesting Actor model which Akka easily has ported into Java.

For running queues on Postgres with Node.js backend(s), I highly recommend https://github.com/timgit/pg-boss. I'm sure it has it scale limits. But if you're one of the 90% of the apps that never needs any kind of scale that a modern server can't easily handle then it's fantastic. You get transactional queueing of jobs, and it automatically handles syncing across multiple job processing servers using Postgres locks.

Jobs use pg-boss, a postgres extension, to queue and run tasks under the hood.

If you don't want to roll your own, look into https://github.com/timgit/pg-boss

I saw this https://github.com/timgit/pg-boss but it's more for jobs than for message with multiple consumers (having their own progress offset).

The best I've used till now. Has all kind of features and really great when you have a postgres dB in your stack. https://github.com/timgit/pg-boss

Check out these; - https://github.com/mitranim/posterus - https://github.com/timgit/pg-boss - https://github.com/FirebaseExtended/firebase-queue - https://www.npmjs.com/package/rabbit-queue

You can use the simplest option than implement a new service. Keep in mind that every running system can be a job scheduler, you can just use nodejs worker threads, Redis, or even your DB as a job scheduler, check PGBoss for example.

Both! For context, we're currently using https://github.com/timgit/pg-boss as a task queue on top of postgres and it works great. No need to complicate things with Redis. I believe it's quite straightforward to implement a task queue on top of postgres using the SKIP LOCKED functionality.