Project: RabbitMQ (App Definition and Development / Streaming & Messaging)
File: 3.7.8.md

RabbitMQ `3.7.8` a maintenance release. It focuses on bug fixes and further improves compatibility. This release has no known incompatibilities with earlier `3.7.x` releases. When upgrading to this release and upgrading Erlang to 21.0 at the same time, extra care has to be taken. Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21, RabbitMQ must be upgraded before Erlang. See upgrade and compatibility notes if upgrading from an earlier release. See the for general documentation on upgrades and for release notes of other releases. Virtual host (specifically binding) recovery has been optimized. GitHub issue: A binding removal optimization was reverted because it could result in custom exchange type state not cleaned up as plugin authors intended. GitHub issue: A queue sync operation now can be cancelled when a resource alarm is in effect on the receiving node. GitHub issue: Inter-node communication port (a.k.a. distribution port) unintentionally used an excessively large buffer size (1.2 GB instead of 128 MB). Kudos to Chris Friesen for noticing and reporting this. GitHub issue: More idempotent binding removal. When transactions that removed bindings were rolled back and retried, the code that performed the deletion could fail with a misleading assertion failure, `{error, not_found}`. GitHub issue: A resource alarm triggered during boot could prevent node from starting. GitHub issue: Environments with high queue or channel churn could run into an exception in local process group. GitHub issue: Priority queues no longer fail with an exception when used together with other `rabbitbackingqueue` behaviour implementations. Contributed by Matteo Cafasso. GitHub issue: Syslog configuration parameters could be rejected by config validator. GitHub issue: `rabbitmq-echopid.bat` now loads `rabbitmq-env.bat` correctly. GitHub issue: Improved config file validation and loading. For example, `advanced.config` now can be used without the main `rabbitmq.conf` config file. GitHub issue: On Erlang/OTP 21 Syslog server now can be configured using a hostname (not just an IP address). GitHub issue: `rabbitmqctl renameclusternode` documentation improvements. GitHub issue: Policies were unintentionally excluded from `rabbitmqctl report` output. Contributed by Ayanda Dube. GitHub issue: Global parameters were unintentionally excluded from `rabbitmqctl report` output. GitHub issue: Virtual host imported from definitions or created via HTTP API will explicitly await for the vhost to initialise on all cluster nodes. This change was previously scheduled for `3.7.6` but was only partially applied (didn't have any effect on HTTP API clients). GitHub issues: , HTTP API connection endpoints returned a duplicate key, `node`. GitHub issue: Response compression wasn't enabled by default for compatible clients. Failed login error message now clears automatically after successful login. GitHub issue: Cowboy listener settings now can be configured using new style config file. GitHub issue: Cowboy timeouts now can be configured. GitHub issues: `rabbitmqadmin` now supports a new argument,

GitHub issue: Switching sections will now scroll to the top of the newly rendered page. GitHub issue: Message distribution uniformity has been significantly improved. is now used for the hashing function. GitHub issue: Nodes experiencing very high connection churn could run out of Erlang processes. GitHub issues: , WebSocket endpoint path is now configurable. GitHub issue: Session presence flag was always set to `true` regardless of the state of client connection session. GitHub issue: WebSocket endpoint path is now configurable. Contributed by Thomas Sauzeau. GitHub issue: The plugin could try to try to forward messages consumed from the source before receiving credit from the AMQP 1.0 destination. GitHub issue: `sasl=plain` is now added to connection URIs if no other mechanism is specified explicitly by the user. GitHub issue: TLS version for AMQP 1.0 endpoints now can be configured via a connection URI query parameter. GitHub issue: Specifying a port without a hostname in connection URI is now considered to be an unsupported combination and will throw an error. GitHub issue: Improved OTP release handling compatibility. Contributed by Ayanda Dube. GitHub issue: Link initialization optimizations. Contributed by Ayanda Dube. GitHub issues: , Specifying a port without a hostname in connection URI is now considered to be an unsupported combination and will throw an error. GitHub issue: Node name is now correctly extracted from the keys returned by etcd even when key prefix includes slashes. GitHub issue: Package installation scripts will make sure that the `/etc/rabbitmq` directory is readable. GitHub issue: Package installation scripts will make sure that the `/etc/rabbitmq` directory is readable. GitHub issue: If `rabbitmq-plugins` is invoked before first server start, Erlang cookie permissions will be correctly set to those of the RabbitMQ user and group (currently `rabbitmq`). GitHub issue: `amq.rabbitmq.event` exchange is now deleted when plugin is disabled. GitHub issue: The plugin now can be configured using new style config file: ``` ini rabbitmqeventexchange.vhost = audit ``` GitHub issue: It is now possible to set up a tracer on any cluster node via management UI and HTTP API. GitHub issue: Tracer connection credentials now can be specified via the management UI and HTTP API. GitHub issue: `sasl=plain` is now added to connection URIs if no other mechanism is specified explicitly by the user. GitHub issue: `hostname` connection parameter will now be set to the value of the `address` parameter for improved compatibility with AMQP 1.0 implementations (e.g. Azure ServiceBus) that expect it to be set. GitHub issue: TLS version now can be configured via a connection URI query parameter. GitHub issue: Specifying a port without a hostname in connection URI is now considered to be an unsupported combination and will throw an error. GitHub issue: 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-3.7.8.tar.gz`.