3.9.12

RabbitMQ 3.9.12 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

Bug Fixes

• Work around a slow Windows-specific memory leak in Erlang's file:read_file/1.

  GitHub issues: #3936, #3906

• log.file.rotation.date pattern parser now supports more values and is closer to Lager in RabbitMQ 3.7 and earlier releases.

  GitHub issue: #3831

• User limits were ignored by definition import.

  GitHub issue: #3458

• Stream coordinator could run into an exception in some scenarios.

  GitHub issue: #3908

• On node shutdown, stopped applications were unintentionally logged at the error level.

  GitHub issue: #3900

Enhancements

• basic.* AMQP 0-9-1 operations now consume fewer CPU cycles.

  GitHub issue: #3934

• More efficient (up to 67% more) user addition and updates, including during definition import.

  GitHub issue: #3894

• Authentiication and authorization backend exceptions could potentially leak user-provided credentials to node log.

  Contributed by @luos on behalf of LKAB.

  GitHub issue: #3903

• When a non-existent stream offset is requested, the server will return a more appropriate error code.

  GitHub issue: #3783

• Stream operations that fail due to an unavailable leader now use a separate error code from the case when the stream does not exist.

  GitHub issue: #3874

• Deprecated classic health check is now less resource intensive (but still very intensive compared to modern alternatives).

  GitHub issue: #3905

• Operator and regular policy merging now supports keys that use boolean values. The operator value overrides the regular policy one.

  GitHub issue: #3880

• Free disk space monitoring robustness improvements on Windows.

  GitHub issue: #3895

• Unnamed parameters and policies in definition files will now be rejected as invalid.

  Contributed by @polaris-alioth.

  GitHub issue: #971

OAuth 2 Plugin

Enhancements

• HTTPS client and related improvements for JWKS URLs.

  Contributed by @anhanhnguyen on behalf of LKAB.

  GitHub issue: #3887

Dependency Upgrades

None in this release.

Source Code Archives

To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.12.tar.xz instead of the source tarball produced by GitHub.