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rabbitmq-server/release-notes/3.9.16.md

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RabbitMQ 3.9.16 is a maintenance release in the 3.9.x release series.

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

Enhancements

  • Quorum queues: better forward compatibility with (currently in preview) RabbitMQ 3.10.

    GitHub issue: #4560

  • Significantly faster queue re-import from definitions on subsequent node restarts. Initial definition import still takes the same amount of time as before.

    GitHub issue: #4538

  • Significantly faster exchange re-import from definitions on subsequent node restarts. Initial definition import still takes the same amount of time as before.

    GitHub issue: #4585

  • RabbitMQ nodes will now filter out certain log messages related to connections, channels, and queue leader replicas receiving internal protocol messages sent to this node before a restart. These messages usually raise more questions and cause confusion than help.

    It is still possible to detect relevant underlying events (node or connection failures) from other log messages.

    GitHub issue: #4557

Bug Fixes

  • rabbitmq-upgrade await_online_synchronized_mirror is now a no-op in single node clusters

    GitHub issue: #4570

Prometheus Plugin

Bug Fixes

  • One metric that was exposed via CLI tools and management plugin's HTTP API was not exposed via Prometheus scraping API.

    Contributed by @gomoripeti.

    GitHub issue: #4645

Dependency Upgrades

Source Code Archives

To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.16.tar.xz instead of the source tarball produced by GitHub.