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RabbitMQ `3.9.17` 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 Erlang 24. [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 can be found on GitHub at [rabbitmq-server/release-notes](https://github.com/rabbitmq/rabbitmq-server/tree/v3.10.x/release-notes).
### Core Server
#### Enhancements
* With a lot of busy quorum queues, nodes hosting a moderate number of of leader replicas could
experience growing memory footprint of one of the Raft implementation processes.
GitHub issue: [#4760](https://github.com/rabbitmq/rabbitmq-server/pull/4760)
* Re-introduced key file log rotation settings.
Some [log rotation](https://rabbitmq.com/logging.html) settings were left behind
during the migration to the standard runtime logger starting with 3.9.0.
Now some key settings have been re-introduced.
Contributed by Alex @illotum Valiushko (AWS).
GitHub issue: [#4758](https://github.com/rabbitmq/rabbitmq-server/pull/4758)
* Cleaned up some compiler options that are no longer relevant.
Contributed by Péter @gomoripeti Gömöri (CloudAMQP).
GitHub issue: [#4707](https://github.com/rabbitmq/rabbitmq-server/pull/4707)
#### Bug Fixes
* Nodes now make sure that [maintenance mode](https://rabbitmq.com/upgrade.html#maintenance-mode) status table exists after node boot
as long as the feature flag is enabled.
GitHub issue: [#4760](https://github.com/rabbitmq/rabbitmq-server/pull/4760)
### JMS Topic Exchange Plugin
#### Bug Fixes
* "In flight" messages directed to an exchange that has just been deleted will be
silently dropped or [returned back to the publisher](https://rabbitmq.com/publishers.html#unroutable) instead of causing an exception.
GitHub issue: [#4696](https://github.com/rabbitmq/rabbitmq-server/pull/4696)
## Dependency Upgrades
* `ra` upgraded from [`2.0.9` to `2.0.11`](https://github.com/rabbitmq/ra/compare/v2.0.9...v2.0.11)
* `credentials_obfuscation` was upgraded [from v2.4.0 to v3.0.0](https://github.com/rabbitmq/credentials-obfuscation/compare/v2.4.0...v3.0.0)
## Source Code Archives
To obtain source code of the entire distribution, please download the archive named `rabbitmq-server-3.9.17.tar.xz`
instead of the source tarball produced by GitHub.
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