About Maple
Maple is a simple job queue built on PostgreSQL: enqueue work in the same transaction as your data and let workers pick it up. It began in 2025 as a replacement for a tool that had grown too large for the job and is maintained by a handful of people in their spare time.
#What we care about
- Predictability. Maple should do the same thing every time and say clearly when it cannot.
- Few moving parts. One binary, one configuration file, no daemons it depends on.
- Good documentation. If something is not written down here, that is a bug.
#Versioning
Maple follows semantic versioning. Within a major version, configuration files and command lines keep working; anything deprecated keeps working for at least two minor releases and is listed in the changelog.
#License
Maple is free software, released under the MIT License:
Copyright (c) 2025 The Maple Authors
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.