rabbitmq/rabbitmq-server v4.2.5

RabbitMQ 4.2.5

on GitHub

RabbitMQ 4.2.5 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 queues could terminate and restart during recovery in certain rare conditions.

  GitHub issue: #15595

• Quorum queues could incorrectly reject messages during deletion.

  GitHub issue: #15554

• Peer discovery could run into a crash when rabbit_nodes:list_members/0 returned
  an empty list due to an error or a timeout.

  GitHub issue: #15568

• Definition import now strips a leading UTF-8 BOM if the input file has one.

  GitHub issues: #13748, #15550

• Exceptions thrown by decorator callbacks (such as those used by federation)
  during policy change notifications were silently suppressed. They are now logged.

  GitHub issue: #15525

Enhancements

• Improved Mnesia-to-Khepri migration throughput.

  GitHub issue: #15480

• Additional aten settings are now exposed in rabbitmq.conf.
  Previously only the poll interval was configurable.

  GitHub issue: #15564

Stream Plugin

Bug Fixes

• parse_command/1 crashed with a function_clause error when receiving a zero-size frame,
  such as those sent by load balancer probes or port scanners.

  GitHub issue: #15703

• rabbit_stream_manager could crash with a case_clause error when a stream declaration
  failed due to a metadata store timeout.

  GitHub issue: #15699

Enhancements

• Less log noise from load balancer and port scanner probes (that do not perform an AMQP 1.0 or AMQP 0-9-1 handshake)

  GitHub issue: #15715

Management Plugin

Bug Fixes

• Request bodies above the configured maximum limit are now rejected earlier.

  GitHub issue: #15712

• Validation improvements for several API endpoints.

  They now ignore node names that do not refer to existing cluster members,
  reject unknown fields, etc.

  GitHub issues: #15622, #15623, #15625, #15627

• Queue API responses now include policy-related fields (policy, operator_policy,
  effective_policy_definition) and delivery_limit when management stats collection
  is disabled via rabbitmq.conf.

  GitHub issues: #15182, #15651

CLI Tools

Bug Fixes

• rabbitmq-diagnostics status and rabbitmqctl status crashed when targeting a node
  in maintenance mode because vm_memory_high_watermark was nil
  (the vm_memory_monitor process does not run in that state).

  GitHub issues: #15678, #15680

Enhancements

• rabbitmq-plugins now produces a clearer error message when run by a non-root user.

  GitHub issue: #15701

Federation Management Plugin

Bug Fixes

• The x-internal-purpose and consumer_timeout argument values are now correctly escaped.

  GitHub issues: #15606, #15708

Prometheus Plugin

Bug Fixes

• Per-object metrics endpoint (/metrics/per-object) no longer emits duplicate HELP
  and TYPE metadata lines for Raft metrics when both quorum queues and Khepri are in use,
  which caused scraper parser errors.

  GitHub issues: #15600, #15610

Grafana Dashboards

Enhancements

• The Overview dashboard's "TCP sockets available" panel was replaced with a "File descriptors available" panel
  that uses two modern metrics, rabbitmq_process_max_fds and rabbitmq_process_open_fds.

  GitHub issues: #12673, #15618

Shovel Plugin

Bug Fixes

• An attempt to declare a dynamic shovel with multiple src-queue-args or dest-queue-args values
  configured could run into an exception during validation.

  GitHub issues: #8323, #8356

Web STOMP Plugin

Bug Fixes

• A terminated heartbeat monitor process could cause a crash during connection shutdown.

  GitHub issue: #15607

Dependency Changes

None in this release.