FAQ

#Will this put too much load on my database?

An idle worker runs one cheap query per poll interval. Under load each job costs a select, an update and a delete; PostgreSQL handles thousands of these a second on modest hardware.

#Which PostgreSQL versions are supported?

PostgreSQL 13 and newer. SKIP LOCKED came in 9.5, but some of the indexes need 13.

#Can I enqueue jobs from my application without Maple's CLI?

Yes. Insert a row into maple.jobs; the columns are documented in Queues and workers. Client libraries only make that more convenient.

#Are jobs run exactly once?

At least once. A worker that dies mid-job leaves the job to be retried, so jobs should be safe to run twice.

#Can I pause a queue?

Stop the workers of that queue. Jobs keep being accepted and wait until workers are back.

#Which platforms are supported?

Linux, macOS and FreeBSD on amd64 and arm64. Linux on armv7 and riscv64 is built for every release too, but tested less.

#Is Maple free to use at work?

Yes. It is released under the MIT License, which allows commercial use.

#Does Maple collect telemetry?

No. It never contacts anything you did not configure, and it does not check for updates on its own.