What is Maple?

Maple is a reliable job queue built on PostgreSQL: enqueue work in the same transaction as your data and let workers pick it up.

It is written in Rust and ships as a single binary for Linux, macOS and FreeBSD, on amd64 and arm64. There is nothing else to install: no runtime, no database, no agent.

#Features

• Transactional enqueue. Jobs are rows. Insert one in the same transaction as your data and it exists exactly when the data does.
• Retries with backoff. Failed jobs are retried with exponential backoff and jitter, up to a limit you set per queue.
• Schedules. Run jobs on cron schedules. Only one worker enqueues each run, however many you start.
• Any language. Workers call your code over a small HTTP or stdin protocol, so jobs can be written in anything.
• Fast pickup. Workers use LISTEN/NOTIFY to pick up new jobs within milliseconds, and SKIP LOCKED to never collide.
• Metrics. Queue depth, latency and failures as Prometheus metrics, ready for your dashboards.

#Next steps

• Install Maple on your machine or server.
• Follow the quick start for a first run.
• Look up every option in the configuration reference.
• Stuck? The FAQ answers the common ones.