rabbitmq-server/3.7.27.md at deploy-spring-oauth-server

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RabbitMQ 3.7.27

RabbitMQ 3.7.27 is a maintenance release. It contains a couple of backports from the 3.8.x branch.

RabbitMQ 3.7.x series are out of general support and covered by the limited extended support policy only.

Please consider upgrading to RabbitMQ 3.8.x.

Erlang/OTP Compatibility Notes

This release no longer supports Erlang/OTP 20.3. Erlang 21.3+ is now a hard requirement checked on node startup.

Make sure a supported Erlang version is used before upgrading. Provisioning Latest Erlang Releases explains what package repositories and tools can be used to provision latest patch versions of Erlang 21.3.x and 22.x.

Compatibility Notes

Upgrading to Erlang 21.x or Later Versions

When upgrading to this release and upgrading Erlang to 21.x or later 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 or later, RabbitMQ must be upgraded before Erlang.

Upgrade Doc Guides and Change Log

See 3.7.0 release notes upgrade and compatibility notes first if upgrading from an earlier release.

See the Upgrading guide for general documentation on upgrades and RabbitMQ change log for release notes of other releases.

Getting Help

Any questions about this release, upgrades or RabbitMQ in general are welcome on the RabbitMQ mailing list.

Changes

Core Server

Enhancements

More peer discovery errors are retried.

GitHub issue: rabbitmq/rabbitmq-server#1627
Initial Erlang/OTP 24 compatibility.

Erlang/OTP 24 is expected to ship in mid-2021. While RabbitMQ 3.7 will be out of support by then, some initial compatibility work was backported to this branch due to contious integration on Erlang/OTP master.

Federation Plugin

Bug Fixes

One-off connections periodically used by exchange federation links now handle timeouts in certain operations gracefully. This avoids unnecessary link disruption and restarts in certain environments. The default interval has also been bumped from 30s to 90s.

In environments with stable topologies the interval can be significantly increased to decrease connection churn, simplify monitoring and in general conserve some resources:
```
%% advanced.config
[
 {rabbitmq_federation, [
     %% 86400 seconds or 24 hours
     {internal_exchange_check_interval, 86400000}
 ]}
].
```
GitHub issue: rabbitmq/rabbitmq-federation#107

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-3.7.27.tar.xz.

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