rabbitmq-server/release-notes/3.9.15.md

RabbitMQ 3.9.15 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

• Stream delivery rate could drop if concurrent stream consumers consumed in a way that made them reach the end of the stream often.

  GitHub issue: #4371

• If a cluster that had streams enabled was upgraded with a jump of multiple patch releases, stream state could fail an upgrade.

  GitHub issue: #4510

• 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

• When a policy contained keys unsupported by a particular queue type, and later updated or superseded by a higher priority policy, effective optional argument list could become inconsistent (policy would not have the expected effect).

  Kudos to @jaroslaw-bochniak for providing very detailed reproduction steps.

  GitHub issue: #4463

• Priority queues could run into an exception in some cases.

  Contributed by @luos and @olikasg.

  GitHub issue: #4405

• Maintenance mode could run into a timeout during queue leadership transfer.

  Contributed by @felixhuettner.

  GitHub issue: #4468

Prometheus Plugin

Bug Fixes

• Prometheus collector could run into an exception early on node's schema database sync.

  GitHub issue: #4376

Management Plugin

Bug Fixes

• Connection data transfer rate units were incorrectly displayed when rate was less than 1 kiB per second.

  Contributed by @zgabi.

  GitHub issue: #4523

• rabbitmqadmin now correctly loads TLS-related keys from its configuration file.

  Contributed by @fwolfsjaeger.

  GitHub issue: #4408

• Corrected a help message for node memory usage tool tip.

  Contributed by @etc-crontab.

  GitHub issue: #4493

LDAP Plugin

Enhancements

• More Erlang 24.3's eldap library compatibility improvements.

  GitHub issue: #4448

Dependency Upgrades

• ra upgraded from 2.0.4 to 2.0.9
• prometheus upgraded from 4.8.1 to 4.8.2
• eetcd upgraded from 0.3.3 to 0.3.5

Source Code Archives

To obtain source code of the entire distribution, please download the archive named rabbitmq-server-3.9.15.tar.xz instead of the source tarball produced by GitHub.