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## RabbitMQ 3.7.4
RabbitMQ `3.7.4` is a patch release that primarily includes bug fixes.
### Upgrades and Compatibility
This release has no known incompatibilities with earlier 3.7.x versions.
See [3.7.0 release notes](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v3.7.0) upgrade and compatibility notes if upgrading from an earlier release.
See the [Upgrading guide](https://www.rabbitmq.com/upgrade.html) for general documentation on upgrades.
See [RabbitMQ change log](https://www.rabbitmq.com/changelog.html) for release notes of other releases.
## Changes
### Core Server
#### Bug Fixes
* Priority queues could terminate when the node was under memory pressure and needed to
offload messages to disk.
GitHub issue: [rabbitmq-server#1535](https://github.com/rabbitmq/rabbitmq-server/issues/1535)
* queue leader locator strategy of `min-masters` was affected by queue binding count and could
select the wrong node.
GitHub issue: [rabbitmq-server#1519](https://github.com/rabbitmq/rabbitmq-server/issues/1519)
* It was not possible to set [randomized startup delay](https://www.rabbitmq.com/cluster-formation.html#initial-formation-race-condition) range via new style config file.
GitHub issue: [rabbitmq-server#1531](https://github.com/rabbitmq/rabbitmq-server/issues/1531)
* Windows scripts used `USE_LONGNAME` from the env file incorrectly.
GitHub issue: [rabbitmq-server#1508](https://github.com/rabbitmq/rabbitmq-server/issues/1508)
* systemd notification implementation was prone to shell escaping issues.
GitHub issue: [rabbitmq-server#1187](https://github.com/rabbitmq/rabbitmq-server/issues/1187)
* It wasn't possible to configure `delegate_count` via new style config file.
GitHub issue: [rabbitmq-server#1497](https://github.com/rabbitmq/rabbitmq-server/issues/1497)
* It wasn't possible to configure `net_ticktime` via new style config file.
GitHub issue: [rabbitmq-server#1522](https://github.com/rabbitmq/rabbitmq-server/issues/1522)
#### Enhancement
* It is now possible to configure max number of Erlang processes and atoms using
`RABBITMQ_MAX_NUMBER_OF_PROCESSES` (`MAX_NUMBER_OF_PROCESSES` in `rabbitmq-env.conf`) and `RABBITMQ_MAX_NUMBER_OF_ATOMS`
(`MAX_NUMBER_OF_ATOMS`) environment variables, respectively.
GitHub issue: [rabbitmq-server#1528](https://github.com/rabbitmq/rabbitmq-server/pull/1528)
* `SCHEDULER_BIND_TYPE` and `DISTRIBUTION_BUFFER_SIZE` now can be used in `rabbitmq-env.conf` without
the `RABBITMQ_` prefix.
GitHub issue: [rabbitmq-server#1528](https://github.com/rabbitmq/rabbitmq-server/pull/1528)
### CLI Tools
#### Bug Fixes
* `rabbitmq-plugins set` failed when was used in offline mode (with `--offline`)
GitHub issue: [rabbitmq-cli#241](https://github.com/rabbitmq/rabbitmq-cli/issues/241)
* `rabbitmqctl list_*` command streaming now can be restricted to a set of client TCP ports
used to contact RabbitMQ nodes.
GitHub issue: [rabbitmq-cli#237](https://github.com/rabbitmq/rabbitmq-cli/issues/237)
### Management Plugin
#### Bugs
* Valid definitions could be rejected as invalid during import via HTTP API.
GitHub issue: [rabbitmq-management#552](https://github.com/rabbitmq/rabbitmq-management/issues/552)
* It wasn't possible to configure `path_prefix` via new style config file.
GitHub issue: [rabbitmq-management#547](https://github.com/rabbitmq/rabbitmq-management/issues/547)
### Federation Plugin
#### Bugs
* Valid upstreams were rejected as invalid when imported from a definition file.
GitHub issue: [rabbitmq-federation#70](https://github.com/rabbitmq/rabbitmq-federation/issues/70)
* Valid upstream sets were rejected as invalid when added using CLI tools.
GitHub issue: [rabbitmq-federation#67](https://github.com/rabbitmq/rabbitmq-federation/issues/67)
### Peer Discovery AWS Plugin
#### Bugs
* The plugin skipped registration and thus [randomized startup delay](https://www.rabbitmq.com/cluster-formation.html#initial-formation-race-condition) injection.
GitHub issue: [rabbitmq-peer-discovery-aws#17](https://github.com/rabbitmq/rabbitmq-peer-discovery-aws/issues/17)
## 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-3.7.4.tar.gz`.
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