rabbitmq-server/release-notes/3.9.7.md

RabbitMQ `3.9.7` is a maintenance release in the `3.9.x` release series.

Please refer to the **Upgrading to 3.9** section from [v3.9.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.9.0) if upgrading from a version prior to 3.9.0.

This release requires at least Erlang 23.2, and supports the latest Erlang 24 version, 24.0.5 at the time of release. [RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on Erlang version requirements for RabbitMQ.


## Changes Worth Mentioning

Release notes are kept under [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.9.x/release-notes).
Contributors are encouraged to update them together with their changes. This helps with release automation and a more consistent release schedule.

### All Components

  * All bytecode is now compiled using the `+deterministic` compiler flag. This should eliminate the capture of some irrelevant build environment attributes in produced artifacts, improve consistency between builds, and reduce the file level diff between release artifacts.

    GitHub issue: [#3442](https://github.com/rabbitmq/rabbitmq-server/pull/3442)


### Core Server

#### Enhancements

 * Classic queue shutdown now uses a much higher timeout (up to 10 minutes instead of 30 seconds).

   In environments with many queues (especially mirrored queues) and many consumers this means that
   the chance of queue indices rebuilding after node restart is now substantially lower.

   GitHub issue: [#3409](https://github.com/rabbitmq/rabbitmq-server/pull/3409)

#### Bug Fixes

* Quorum queues no longer leak memory and disk space when a consumer is repeatedly added and cancelled on an empty queue.

   GitHub issue: [#3445](https://github.com/rabbitmq/rabbitmq-server/issues/3445)


### Prometheus Plugin

#### Enhancements

 * More configurability for metrics exposed via the Prometheus endpoint.

   GitHub issue: [#3421](https://github.com/rabbitmq/rabbitmq-server/pull/3421)


### Shovel Plugin

#### Bug Fixes

 * Shovel URIs could be logged with credentials in some scenarios.

   GitHub issue: [#3476](https://github.com/rabbitmq/rabbitmq-server/pull/3476), contributed by @thuandb (AWS)


## Dependency Upgrades

 * observer_cli has been upgraded from `1.6.2` to `1.7.1`


## Source Code Archives

To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.7.tar.xz` instead of the source tarball produced by GitHub.
Update release notes 2021-09-17 16:13:07 +08:00			RabbitMQ `3.9.7` is a maintenance release in the `3.9.x` release series.

			`Please refer to the Upgrading to 3.9 section from [v3.9.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.9.0) if upgrading from a version prior to 3.9.0.`

			`This release requires at least Erlang 23.2, and supports the latest Erlang 24 version, 24.0.5 at the time of release. [RabbitMQ and Erlang/OTP Compatibility Matrix](https://www.rabbitmq.com/which-erlang.html) has more details on Erlang version requirements for RabbitMQ.`



			`## Changes Worth Mentioning`

			`Release notes are kept under [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.9.x/release-notes).`
			`Contributors are encouraged to update them together with their changes. This helps with release automation and a more consistent release schedule.`

			`### All Components`

			* All bytecode is now compiled using the `+deterministic` compiler flag. This should eliminate the capture of some irrelevant build environment attributes in produced artifacts, improve consistency between builds, and reduce the file level diff between release artifacts.

			`GitHub issue: [#3442](https://github.com/rabbitmq/rabbitmq-server/pull/3442)`

Update 3.9.7 release notes 2021-09-24 04:33:19 +08:00
Update release notes 2021-09-17 16:13:07 +08:00			`### Core Server`

(cherry picked from commit 7ce2a0dac810211015012354a5fd1cce4fb16afe) Conflicts: release-notes/3.9.6.md 2021-09-21 21:46:21 +08:00			`#### Enhancements`
Update release notes 2021-09-17 16:13:07 +08:00
(cherry picked from commit 7ce2a0dac810211015012354a5fd1cce4fb16afe) Conflicts: release-notes/3.9.6.md 2021-09-21 21:46:21 +08:00			`* Classic queue shutdown now uses a much higher timeout (up to 10 minutes instead of 30 seconds).`
Update release notes 2021-09-17 16:13:07 +08:00
(cherry picked from commit 7ce2a0dac810211015012354a5fd1cce4fb16afe) Conflicts: release-notes/3.9.6.md 2021-09-21 21:46:21 +08:00			`In environments with many queues (especially mirrored queues) and many consumers this means that`
			`the chance of queue indices rebuilding after node restart is now substantially lower.`
Update release notes 2021-09-17 16:13:07 +08:00
(cherry picked from commit 7ce2a0dac810211015012354a5fd1cce4fb16afe) Conflicts: release-notes/3.9.6.md 2021-09-21 21:46:21 +08:00			`GitHub issue: [#3409](https://github.com/rabbitmq/rabbitmq-server/pull/3409)`
Update release notes 2021-09-17 16:13:07 +08:00
Update 3.9.7 release notes 2021-09-24 17:53:11 +08:00			`#### Bug Fixes`

			`* Quorum queues no longer leak memory and disk space when a consumer is repeatedly added and cancelled on an empty queue.`

			`GitHub issue: [#3445](https://github.com/rabbitmq/rabbitmq-server/issues/3445)`

Update release notes 2021-09-17 16:13:07 +08:00
Update 3.9.7 release notes 2021-09-24 04:33:19 +08:00			`### Prometheus Plugin`

			`#### Enhancements`

			`* More configurability for metrics exposed via the Prometheus endpoint.`

			`GitHub issue: [#3421](https://github.com/rabbitmq/rabbitmq-server/pull/3421)`


			`### Shovel Plugin`

			`#### Bug Fixes`

			`* Shovel URIs could be logged with credentials in some scenarios.`

			`GitHub issue: [#3476](https://github.com/rabbitmq/rabbitmq-server/pull/3476), contributed by @thuandb (AWS)`


Update release notes 2021-09-17 16:13:07 +08:00			`## Dependency Upgrades`

Upgrade to Observer CLI 1.7.1 Previous version was not working on Windows due to a crash. 2021-09-21 19:44:20 +08:00			* observer_cli has been upgraded from `1.6.2` to `1.7.1`
Update release notes 2021-09-17 16:13:07 +08:00

			`## Source Code Archives`

			To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.7.tar.xz` instead of the source tarball produced by GitHub.