3.8.9 is a maintenance release.
It focuses on bug fixes and usability improvements.
This release no longer supports Erlang 21.3.
Erlang 23 Compatibility
Erlang/OTP Compatibility Notes
This release requires Erlang/OTP 22.0 or later.
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
Upgrade and Compatibility Notes
Upgrade Doc Guides and Change Log
See 3.8.0 release notes upgrade and
compatibility notes first if upgrading from an earlier release series (e.g.
Upgrading to Erlang 22.x or Later Versions
When upgrading to this release from
3.7.15 or an older version, extra care has to be taken.
Because older RabbitMQ CLI tools can be incompatible with Erlang 22+ releases,
RabbitMQ must be upgraded at the same time as Erlang.
Alternatively the node can be upgraded to
3.7.18 on Erlang 21.3 first,
then Erlang 22.x or 23.x, then RabbitMQ to most recent 3.8.x release.
Any questions about this release, upgrades or RabbitMQ in general are welcome on the RabbitMQ mailing list.
Changes Worth Mentioning
3.8.0, an unintentionally introduced assertion could prevent classic mirrored queue
mirrors from starting successfully in case the primary replica changed concurrently with their startup.
GitHub issue: rabbitmq/rabbitmq-server#2449
Raft implementation's failure detector default polling interval has been increased from 1s to 5s.
The previously used default results in too frequent leader elections in networks with high packet loss
(say, double digit percent).
This has no correctness or safety ramifications, however, automated tests that assert on Raft properties
or expect a very fast leader re-election may have to set it back so that peer failures are detected quicker.
GitHub issue: rabbitmq/rabbitmq-server#2450
The now deprecated intrusive health check endpoint,
GET /api/healthchecks/node, reported failures in the response
but always set the status to
200 OK. It now uses the status of
500in case of a failure.
RabbitMQ Monitoring guide explains why
this health check is no longer recommended and what the alternatives are.
GitHub issue: rabbitmq/rabbitmq-management#840
When a client doubly encodes a request into JSON, the plugin tries to detect that and will produce a more
helpful 400 response instead of a 500.
GitHub issue: rabbitmq/rabbitmq-management#839
When a classic mirrored queue with a replica on every cluster node (this is highly discouraged) was federated,
multiple links could be started by the plugin, potentially making message transfers concurrent
and affecting ordering.
GitHub issue: rabbitmq/rabbitmq-federation#114
It is now possible to federate exchanges in different virtual hosts in the same cluster for more than one hop.
For example, federate messages from an exchange in virtual host B to C, while B itself is federated from
virtual host A. Previously such messages would have been filtered by the message cycle detection algorithm
which assumed that exchanges are only federated across clusters.
GitHub issue: rabbitmq/rabbitmq-federation#116
Kubernetes Peer Discovery Plugin
Kubernetes API events registered by this plugin mixed up reason and message fields.
Contributed by Gabriele Santomaggio.
GitHub issue: rabbitmq/rabbitmq-peer-discovery-k8s#70
OAuth 2 AuthN/AuthZ Plugin
Improved compatibility with Azure AD. This plugin can now be configured to fetch scopes from a non-standard
field in the decoded token value (other than the standard
Contributed by @Robert-Gustafsson.
GitHub issue: rabbitmq/rabbitmq-auth-backend-oauth2#53
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