3.9.27 - Rabbitmq Server

RabbitMQ 3.9.27 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 24.2, and supports Erlang 25. RabbitMQ and Erlang/OTP Compatibility Matrix has more details on Erlang version requirements for RabbitMQ.

Minimum Supported Erlang Version

Erlang 23 support has reached its end of support.

Starting with this release, RabbitMQ requires Erlang 24.2 or later versions. Nodes will fail to start on older Erlang releases.

Changes Worth Mentioning

Release notes can be found on GitHub at rabbitmq-server/release-notes.

Core Server

Enhancements

Free disk space monitor robustness improvements.

Backported by @drencrom (Canonical).

GitHub issue: #5739
raft.adaptive_failure_detector.poll_interval exposes aten's poll_interval setting to RabbitMQ users. Increasing it can reduce the probability of false positives in clusters where inter-node communication links are used at close to maximum capacity. The default is 5000 (5 seconds).

GitHub issue: #6632
When both disk_free_limit.relative and disk_free_limit.absolute, or both vm_memory_high_watermark.relative and vm_memory_high_watermark.absolute are set, the absolute settings will now take precedence.

Contributed by @SimonUnge (AWS).

GitHub issue: #4980

Bug Fixes

Classic queues with Single Active Consumer enabled could run into an exception.

GitHub issue: #6513
When a global parameter was cleared, nodes emitted an internal event of the wrong type.

GitHub issue: #6540

CLI Tools

Enhancements

New key supported by rabbitmqctl list_queues: effective_policy_definition that returns merged definitions of regular and operator policies effective for the queue.

GitHub issue: #6556

Management Plugin

Enhancements

New HTTP API endpoint, GET /api/config/effective, returns effective node configuration. This is an HTTP API counterpart of rabbitmq-diagnostics environment.

Contributed by @SimonUnge (AWS).

GitHub issue: #6016

Dependency Upgrades

None in this release.

Source Code Archives

To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.27.tar.xz instead of the source tarball produced by GitHub.