Please refer to the Upgrading to 3.9 section from v3.9.0 release notes if upgrading from a version prior to 3.9.0.
This release requires at least Erlang 23.2, and supports Erlang 24. RabbitMQ and Erlang/OTP Compatibility Matrix has more details on Erlang version requirements for RabbitMQ.
Changes Worth Mentioning
Release notes are kept under rabbitmq-server/release-notes.
Contributors are encouraged to update them together with their changes. This helps with release automation and a more consistent release schedule.
Core Server
Bug Fixes
- Disk space monitor now correctly parses output on (at least some) systems where non-ASCII characters are used in paths.
GitHub issue: #3970
- Stream leader election is now deterministic when cluster is undergoing a rolling upgrade.
GitHub issue: #3967
Enhancements
- Queue and binding definition import can be delayed until a moment
when at least N nodes (e.g. three) have joined the cluster. This way imported quorum queues will have a desired
number of replicas from the start.GitHub issue: #3986
Dependency Upgrades
- Osiris was upgraded to
1.2.4
Source Code Archives
To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.13.tar.xz
instead of the source tarball produced by GitHub.