z4j-rq

The RQ engine adapter for z4j.

Streams supported RQ job lifecycle events from your workers to z4j and accepts operator control actions from the dashboard. Pair with z4j-rqscheduler to manage periodic schedules.

Compatibility

• RQ 1.10.1+ and <3 (capped below the RQ 3.0 breaking-major rewrite)
• Python 3.11+

Full per-adapter matrix at https://z4j.dev/reference/compatibility/.

What it ships

Install

pip install z4j-rq z4j-rqscheduler

Pair with a framework adapter:

pip install z4j-django  z4j-rq z4j-rqscheduler   # Django
pip install z4j-flask   z4j-rq z4j-rqscheduler   # Flask
pip install z4j-fastapi z4j-rq z4j-rqscheduler   # FastAPI
pip install z4j-bare    z4j-rq z4j-rqscheduler   # framework-free worker

Pairs with

• z4j-rqscheduler, schedule adapter for rq-scheduler

Reliability

• For POSIX fork workers, select the memory-corrected worker through RQ's standard CLI extension point:

  rq worker --worker-class z4j_rq.worker.Worker default
  

  Keep your existing queues, Redis options, settings module and z4j startup integration. In Python, import Worker from z4j_rq.worker instead of rq. The worker sets each job's environment only in its child process, preventing the parent-side native allocation growth reproduced with stock RQ on glibc. RQ retains execution, monitoring, timeout, retry and shutdown handling; the RQ 1.x session and RQ 2.x process-group behavior are preserved.

• Selecting this class is explicit. Installing the adapter alone does not replace stock or custom workers. SimpleWorker, SpawnWorker and Windows workers are outside this fork-worker repair. If you retain an affected stock fork worker, use --max-jobs 50000 with a process manager configured to restart successful exits. Normal supervision and application memory limits remain useful with either worker.

• Lifecycle-capture failures are isolated from RQ workers and job hooks; capture hooks make no brain network request inline.

• The in-process event queue and SQLite outbound buffer are bounded. Queue overflow drops new events and buffer pressure evicts oldest rows; both losses are logged.

Documentation

Full docs at z4j.dev/engines/rq/.

License

Apache-2.0, see LICENSE. The fork boundary adapted from RQ retains its BSD-2-Clause notice in RQ_LICENSE, included in the installed package.

Links

• Homepage: https://z4j.com
• Documentation: https://z4j.dev
• PyPI: https://pypi.org/project/z4j-rq/
• Issues: https://github.com/z4jdev/z4j-rq/issues
• Changelog: CHANGELOG.md
• Security: security@z4j.com (see SECURITY.md)