rabbitmq/rabbitmq-server v4.2.1

RabbitMQ 4.2.1

on GitHub

RabbitMQ 4.2.1 is a maintenance release in the 4.2.x release series.

It is strongly recommended that you read 4.2.0 release notes
in detail if upgrading from a version prior to 4.2.0.

Minimum Supported Erlang Version

RabbitMQ and Erlang/OTP Compatibility Matrix has more details on Erlang version requirements for RabbitMQ.

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

Bug Fixes

• Quorum queue at-most-once dead lettering for the overflow behaviour drop-head now happens in the correct order.

  GitHub issue: #14926

• Feature flag state in the registry and on disk were not consistent for a period of time during node boot.

  GitHub issue: #14943

Stream Plugin

Bug Fixes

• stream.read_ahead is a new setting that controls how much data is prefetched from disk
  for stream reads (consumption).

  GitHub issue: #14948/

• Stream deletion is now more resilient and can handle certain mid-deletion failure scenarios.

  GitHub issue: #14852

Grafana Dashboards

Enhancements

• The dashboards were updated for RabbitMQ 4.2.x.

  GitHub issue: #14849

Management Plugin

Enhancements

• GET /api/queues/{vhost} requests no longer perform unnecessary virtual host permission checks
  and log less (at debug level) as a result.

  GitHub issue: #14923

Shovel Plugin

Bug Fixes

• Improved target node resource alarm handling for AMQP 1.0 and local shovels.

  GitHub issue: #14886

• Local shovels could run into an exception that would cause a shovel restart.

  GitHub issue: #14872

• AMQP 1.0 shovels ignored the sasl URI parameter.

  GitHub issue: #14867

OAuth 2 Plugin

Bug Fixes

• A usability improvement allows the plugin to automatically load the trusted system x.509 (TLS) certificates.

  GitHub issue: #14927

LDAP Plugin

Bug Fixes

• A usability improvement allows the plugin to automatically load the trusted system certificates
  when the user only enables TLS for the LDAP client but does not configure any other settings.

  GitHub issue: #14937

Dependency Changes

• cuttlefish was upgraded to 3.6.0