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4.2.4

release-notes/4.2.4.md

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RabbitMQ 4.2.4

RabbitMQ 4.2.4 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

  • Classic queue message store could run into an exception when a file was concurrently deleted by a compaction operation.

    GitHub issue: #15411

  • rabbit_quorum_queue:stat/2 could fail when the quorum queue leader was undefined.

    GitHub issues: #15400, #15423

  • The amq.rabbitmq.og exchange is now declared unconditionally at node boot, avoiding a potential deadlock between feature flag enablement and logging to the exchange sink.

    GitHub issue: #15320

MQTT Plugin

Bug Fixes

  • Variable interpolation in topic permissions now. escapes the special regular expression characters before interpolation.

    GitHub issue: #15442

Stream Plugin

Bug Fixes

  • Single Active Consumer coordinator could deadlock when a consumer being deactivated would lose its connection, leaving the consumer group without an active consumer.

    GitHub issue: #15353

Management Plugin

Bug Fixes

  • The Policies page in the management UI incorrectly displayed quorum queue arguments twice on the declaration form in place of stream queue arguments.

    GitHub issue: #15335

  • The clustering listener now correctly reports its TLS enablement status.

    GitHub issue: #15399

Enhancements

  • GET /api/overview and GET /api/nodes now report crypto library (such as OpenSSL) version.

    GitHub issue: #15468

  • RabbitMQ and Erlang/OTP versions are now included in GET /api/nodes responses.

    GitHub issue: #15454

  • Login page usability improvements: autofocus on the username field and autocomplete attributes for browser password manager integration.

    GitHub issue: #15398

CLI Tools

Enhancements

  • rabbitmq-upgrade has_reached_target_cluster_size is a new command that checks whether the cluster has reached its target size, as provided in rabbitmq.conf.

    This is useful for automating rolling upgrades, particularly on Kubernetes.

    GitHub issue: #15404

Shovel Plugin

Bug Fixes

  • Stopping and deleting a shovel could fail with a badmatch exception when the underlying worker process no longer existed.

    GitHub issue: #15408

Trust Store Plugin

Enhancements

  • HTTPS endpoint requests now have a configurable timeout (20 seconds by default), preventing the plugin from hanging indefinitely when a provider fails to respond.

    GitHub issues: #15308, #15310

AWS Peer Discovery Plugin

Bug Fixes

  • Nodes on EC2 instances in non-running states (stopping, stopped, shutting-down, terminated) are now filtered out from peer discovery results.

    GitHub issue: #15388

Enhancements

  • Multiple hostname resolution paths can now be configured. This is an upgrade pathway for scenarios where resolution hostnames have to change.

    GitHub issue: #14705

Tracing Plugin

Bug Fixes

Dependency Changes