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RabbitMQ v3.8.6 Release Notes

Release Date: 2020-08-04 // over 3 years ago

  • RabbitMQ 3.8.6

    🚀 RabbitMQ 3.8.6 is a maintenance release.
    🛠 It focuses on bug fixes and usability improvements.

    RabbitMQ Adopts the Mozilla Public License 2.0

    🚀 Starting with this release, core RabbitMQ server and all tier 1 plugins
    are relicensed under the Mozilla Public License 2.0
    (previously used license: the Mozilla Public License 1.1).

    The permissiveness of the MPL 2.0 is largely the same as of the MPL 1.1.
    👀 See the MPL 2.0 FAQ and
    🙋 MPL 2.0 Revision and Changes FAQ to learn more.

    Erlang 23 Compatibility

    🚀 This release is compatible with Erlang 23.

    Erlang/OTP Compatibility Notes

    This release requires Erlang/OTP 21.3 or later.
    🚀 22.3 or 23.0 releases are recommended.

    🚀 Provisioning Latest Erlang Releases explains
    📦 what package repositories and tools can be used to provision latest patch versions of Erlang 22.3.x.

    ⬆️ Upgrade and Compatibility Notes

    🗄 Deprecations

    🚀 This release removed HiPE precompilation support. HiPE has been deprecated and
    mostly unmaintained since Erlang 22, and will be replaced with a JIT in Erlang 24
    in 2021.

    rabbitmqctl hipe\_compile

    and

    hipe\_compile = true

    are both retained for backwards compatibility but they won't have any effect.

    ⬆️ Upgrade Doc Guides and Change Log

    🚀 See 3.8.0 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.

    ⬆️ Upgrading to Erlang 21.x or Later Versions

    🚀 When upgrading to this release from 3.7.6 or an older version, 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 at the same time as Erlang.

    ⬆️ Alternatively the node can be upgraded to 3.7.18 first, then Erlang 22.x or 23.x, then RabbitMQ to most recent
    🚀 3.8.x release.

    Getting Help

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

    🔄 Changes Worth Mentioning

    Core Server

    License Change

    RabbitMQ has been relicensed under the Mozilla Public License 2.0
    (previously used license: the Mozilla Public License 1.1).

    The permissiveness of the MPL 2.0 is largely the same as of the MPL 1.1.
    👀 See the MPL 2.0 FAQ and
    🙋 MPL 2.0 Revision and Changes FAQ to learn more.

    🗄 Deprecations

    ✂ Removed HiPE pre-compilation support.

    GitHub issue: rabbitmq/rabbitmq-server#2392

    🐛 Bug Fixes

    Definition import on node boot (via the built-in load_definitions configuration setting ) is now performed
    🔌 after plugins are enabled.

    This resolves a long-standing chicken-and-egg dependency problem that prevented definitions
    🔌 that depend on plugins being functional from being successfully imported during node boot.

    🔌 Note that definition import via the management plugin (management.load_definitions) is still
    performed during management plugin activation time and therefore can not offer any guarantees
    🔌 as some plugins may be enabled after the management one.

    Some affected features include

    GitHub issue: rabbitmq/rabbitmq-server#2384

    Similarly, client connection listeners (both TCP and TLS-enabled) are now started after
    🔌 plugin activation. This makes certain configurations that use the trust store plugin
    behave as expected.

    GitHub issue: rabbitmq/rabbitmq-server#2405

    🛠 Environment variables prefixed with RABBITMQ_ were ignored when used in the rabbitmq-env.conf file,
    while their prefixless counterparts worked as expected.

    GitHub issue: rabbitmq/rabbitmq-common#401

    ✨ Enhancements

    📜 rabbitmq.conf config parser now accepts lines that only consist of whitespace.

    GitHub issue: rabbitmq/rabbitmq-server#2393

    CLI Tools

    🗄 Deprecations

    🗄 rabbitmqctl hipe_compile is now a no-op. HiPE support has been deprecated in Erlang 22
    🚚 will be removed in Erlang 24.

    GitHub issue: rabbitmq/rabbitmq-cli#433

    🔧 The use of the `environment variable to configure the [shared secret](https://www.rabbitmq.com/cli.html#erlang-cookie) is now deprecated. 👉 Use the [local file](https://www.rabbitmq.com/cli.html#cookie-file-locations) option instead or, if the value absolutely must be provided on the command line, the--erlang-cookie [value]` switch.

    GitHub issue: rabbitmq/rabbitmq-cli#443

    🐛 Bug Fixes

    rabbitmqctl export_definitions incorrectly serialised runtime parameter values.

    GitHub issue: rabbitmq/rabbitmq-cli#435

    CTL_ERL_ARGS environment variable was unintentionally ignored starting with version 3.8.4.

    GitHub issue: rabbitmq/rabbitmq-server#2394

    [command] --help and help [command] output had minor unintentional inconsistencies.

    GitHub issue: rabbitmq/rabbitmq-cli#437

    ✨ Enhancements

    rabbitmq-queues check_if_node_is_quorum_critical and rabbitmq-queues check_if_node_is_mirror_sync_critical checks
    have been adjusted. They now special case single node clusters as the check does not make much sense
    in those environments.

    rabbitmq-queues check_if_node_is_mirror_sync_critical now also excludes exclusive queues from
    consideration as they, even if matched by a policy that enables classic queue mirroring,
    would not actually be mirrored.

    GitHub issue: rabbitmq/rabbitmq-cli#432

    rabbitmq-diagnostics status now includes the total amount of memory used by the node in its
    regular output. It was previously only available when --formatter=json switch was used.

    GitHub issue: rabbitmq/rabbitmq-cli#449

    rabbitmq-diagnostics erlang_cookie_sources is a new command that helps with troubleshooting
    CLI tool authentication to nodes by listing relevant environment information about the
    shared secret. The actual secret
    is not displayed for obvious security reasons.

    GitHub issue: rabbitmq/rabbitmq-cli#446

    rabbitmqct eval_file is a new command that evaluates Erlang code expressions from a local file
    on the target node:

    rabbitmqctl eval\_file /path/to/code\_snippet.escript

    GitHub issue: rabbitmq/rabbitmq-cli#438

    rabbitmqct eval now accepts code snippets from standard input:

    rabbitmqctl eval \<\<EOF io:format("~p~n", [rabbit:product\_info()]).

rabbitmqctl eval \< code\_snippet.escript

    GitHub issue: rabbitmq/rabbitmq-cli#438

    rabbitmq-diagnostics resolve_hostname is a new command that resolves a hostname either locally
    or on the node, and returns the resolved IPv4 or IPv6 addresses.

    The command can help quickly detect hostname resolution irregularities on a node, including
    the effects of Erlang inetrc file settings.
    Hostname resolution issues can cause CLI tools, cluster formation and peer reconnection to
    not work as expected.

    Some examples:

    rabbitmq-diagnostics resolve\_hostname "google.com" --address-family ipv4 rabbitmq-diagnostics resolve\_hostname "google.com" --address-family ipv6 --offline

    GitHub issue: rabbitmq/rabbitmq-cli#431

    All CLI tools now provide an autocomplete [prefix] command that lists command completion
    options. It is intended to be used to implement autocompletion of command names in shells.

    GitHub issue: rabbitmq/rabbitmq-cli#439

    🔌 Management Plugin

    🐛 Bug Fixes

    🔌 The plugin could send the authorization header as null in some cases before a successful login.

    Contributed by @furkhat.

    GitHub issue: rabbitmq/rabbitmq-management#833

    ✨ Enhancements

    🙋‍♂ The UI now uses more human-friendly information units when displaying client network traffic rate values.

    Contribute by @seadog007.

    GitHub issue: rabbitmq/rabbitmq-management#827

    🔌 Federation Plugin

    🐛 Bug Fixes

    In environments where rabbitmq_federation.pgroup_name_cluster_id is not set or set to undefined,
    🔗 links will treat such values as a false (the default) instead of failing with an exception.

    GitHub issue: rabbitmq/rabbitmq-federation#109

    🔌 MQTT Plugin

    🐛 Bug Fixes

    🔌 The plugin could fail to accept new client connections with an exception in some cases.

    GitHub issue: rabbitmq/rabbitmq-mqtt#235

    🔌 Web STOMP Plugin

    ✨ Enhancements

    🌐 Certain Web Socket errors are now handled more gracefully.

    🌐 GitHub issue: rabbitmq/rabbitmq-web-stomp#123

    🔌 Web MQTT Plugin

    ✨ Enhancements

    🌐 Certain Web Socket errors are now handled more gracefully.

    🌐 GitHub issue: rabbitmq/rabbitmq-web-mqtt#64

    🔌 AuthN/AuthZ Backend HTTP Plugin

    🐛 Bug Fixes

    🔧 Virtual host access checks failed in certain complex configurations.

    GitHub issue: rabbitmq/rabbitmq-auth-backend-http#100

    ⬆️ Dependency Upgrades

    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-3.8.6.tar.xz.