3.7.22

RabbitMQ 3.7.22

RabbitMQ 3.7.22 is a maintenance release that focuses on bug fixes. RabbitMQ 3.7.x series is supported through March 2020.

Erlang/OTP Compatibility Notes

Per the new Erlang version support policy in effect starting with January 2019, this release no longer supports Erlang/OTP 20.3. Make sure a supported Erlang version is used before upgrading.

Provisioning Latest Erlang Releases explains what package repositories and tools can be used to provision latest patch versions of Erlang 21.3.x and 22.x.

Compatibility Notes

Upgrading to Erlang 21.x or Later Versions

When upgrading to this release and upgrading Erlang to 21.x or later at the same time, extra care has to be taken. Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21 or later, RabbitMQ must be upgraded before Erlang.

Upgrade Doc Guides and Change Log

See 3.7.0 release notes upgrade and compatibility notes first if upgrading from an earlier release.

See the Upgrading guide for general documentation on upgrades and RabbitMQ change log for release notes of other releases.

Getting Help

Any questions about this release, upgrades or RabbitMQ in general are welcome on the RabbitMQ mailing list.

Changes

Core Server

Bug Fixes

• One-off Erlang VM starts used by startup scripts now do as little work as possible in order to avoid starting subcomponents, loading configuration and so on.

  GitHub issue: rabbitmq/rabbitmq-common#340

CLI Tools

Bug Fixes

• rabbitmqctl await_startup failed with an exception when RabbitMQ application was stopped but the runtime (Erlang VM) was running.

  GitHub issue: rabbitmq/rabbitmq-server#2158

Management Plugin

Bug Fixes

• Definition import via HTTP API could fail in if performed via HTTP API (but not management UI) and contained operator policies.

  GitHub issue: rabbitmq/rabbitmq-management#751

• When a node cannot compute the number of file descriptors it uses, it will be more resilient and will log warnings (e.g. about missing handle.exe in PATH on Windows) much more proactively.

  GitHub issue: rabbitmq/rabbitmq-management-agent#86

Enhancements

• Metric aggregation optimizations.

  GitHub issue: rabbitmq/rabbitmq-management-agent#84

MQTT Plugin

Enhancements

• Throughput improvements and reduced CPU usage but slightly higher per connection RAM footprint.

  Contributed by Grigory Starinkin (Erlang Solutions).

  GitHub issues: rabbitmq/rabbitmq-mqtt#216, rabbitmq/rabbitmq-mqtt#217

Bug Fixes

• Last Will messages that use QoS 2 will now be downgraded to QoS 1 just like with "regular" published messages.

  GitHub issue: rabbitmq/rabbitmq-mqtt#214

Source code archives

Warning: The source code archive provided by GitHub only contains the source of the broker, not the plugins or the client libraries. Please download the archive named rabbitmq-server-3.7.22.tar.xz.