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## RabbitMQ 3.8.11
RabbitMQ `3.8.11` is a maintenance release that contains bug fixes.
This release [**no longer supports** Erlang 21.3](https://groups.google.com/forum/#!topic/rabbitmq-users/v3K5nZNsfwM).
### Erlang/OTP Compatibility Notes
This release [requires Erlang 22](https://www.rabbitmq.com/which-erlang.html) or
[Erlang 23](http://blog.erlang.org/OTP-23-Highlights/).
Erlang 21.3 [**is no longer supported**](https://groups.google.com/forum/#!topic/rabbitmq-users/v3K5nZNsfwM).
`22.3` or `23.2` releases are recommended.
[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
what package repositories and tools can be used to provision latest patch versions of Erlang `22.3.x`.
## Upgrade and Compatibility Notes
### Upgrade Doc Guides and Change Log
See [3.8.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.8.0) upgrade and
compatibility notes first if upgrading from an earlier release series (e.g. `3.7.x`).
See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades and
[RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
### 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 the 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](https://groups.google.com/forum/#!forum/rabbitmq-users)
and [RabbitMQ community Slack](https://rabbitmq-slack.herokuapp.com/).
## Changes Worth Mentioning
### Core Server
#### Bug Fixes
* Quorum queues that had active consumers during a rolling cluster upgrade could run into an exception and restart loop.
This issue is specific to [RabbitMQ `3.8.10`](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.8.10).
GitHub issue: [rabbitmq/rabbitmq-server#2728](https://github.com/rabbitmq/rabbitmq-server/pull/2728)
* Nodes that had `reverse_dns_lookup` set to `true` could not accept client connections.
This issue is specific to [RabbitMQ `3.8.10`](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.8.10).
GitHub issue: [rabbitmq/rabbitmq-server#2730](https://github.com/rabbitmq/rabbitmq-server/issues/2730)
## Dependency Upgrades
No dependency changes.
## 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-3.8.11.tar.xz`.
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