84 lines
3.3 KiB
Markdown
84 lines
3.3 KiB
Markdown
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## RabbitMQ 3.7.27
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RabbitMQ `3.7.27` is a maintenance release. It contains a couple of backports
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from the `3.8.x` branch.
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RabbitMQ `3.7.x` series are out of general support and covered by the [limited extended support policy](https://www.rabbitmq.com/versions.html) only.
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Please consider [upgrading](https://www.rabbitmq.com/upgrade.html) to [RabbitMQ `3.8.x`](https://www.rabbitmq.com/changelog.html).
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### Erlang/OTP Compatibility Notes
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This release [**no longer supports Erlang/OTP 20.3**](https://groups.google.com/d/msg/rabbitmq-users/G4UJ9zbIYHs/qCeyjkjyCQAJ).
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Erlang `21.3+` is now a **hard requirement** checked on node startup.
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Make sure a [supported Erlang version](https://www.rabbitmq.com/which-erlang.html) is used before upgrading.
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[Provisioning Latest Erlang Releases](https://www.rabbitmq.com/which-erlang.html#erlang-repositories) explains
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what package repositories and tools can be used to provision latest patch versions of Erlang `21.3.x` and `22.x`.
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### Compatibility Notes
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#### Upgrading to Erlang 21.x or Later Versions
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When upgrading to this release **and upgrading Erlang to 21.x or later** at the same time, extra care has to be taken.
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Since CLI tools from RabbitMQ releases older than 3.7.7 will fail on Erlang 21 or later,
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RabbitMQ **must be upgraded before Erlang**.
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#### Upgrade Doc Guides and Change Log
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See [3.7.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.7.0) upgrade
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and compatibility notes first if upgrading from an earlier release.
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See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades
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and [RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
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### Getting Help
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Any questions about this release, upgrades or RabbitMQ in general are welcome on the
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[RabbitMQ mailing list](https://groups.google.com/forum/#!forum/rabbitmq-users).
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## Changes
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### Core Server
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#### Enhancements
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* More peer discovery errors are retried.
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GitHub issue: [rabbitmq/rabbitmq-server#1627](https://github.com/rabbitmq/rabbitmq-server/issues/1627)
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* Initial Erlang/OTP 24 compatibility.
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Erlang/OTP 24 is expected to ship in mid-2021. While RabbitMQ 3.7 will be [out of support](https://www.rabbitmq.com/versions.html) by then,
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some initial compatibility work was backported to this branch due to contious integration on Erlang/OTP master.
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### Federation Plugin
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#### Bug Fixes
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* One-off connections periodically used by exchange federation links now handle timeouts in certain
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operations gracefully. This avoids unnecessary link disruption and restarts in certain environments.
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The default interval has also been bumped from 30s to 90s.
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In environments with stable topologies the interval can be significantly increased to decrease connection
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churn, simplify monitoring and in general conserve some resources:
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``` erlang
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%% advanced.config
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[
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{rabbitmq_federation, [
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%% 86400 seconds or 24 hours
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{internal_exchange_check_interval, 86400000}
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]}
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].
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```
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GitHub issue: [rabbitmq/rabbitmq-federation#107](https://github.com/rabbitmq/rabbitmq-federation/pull/107)
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## Source code archives
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**Warning**: The source code archive provided by GitHub only contains the source of the broker,
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not the plugins or the client libraries. Please download the archive named `rabbitmq-server-3.7.27.tar.xz`.
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