4.1.0-rc.1 release notes
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Michael Klishin
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@ -40,7 +40,7 @@ key in `rabbitmq.conf` and do not set it in the application code.
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[`amqplib`](https://github.com/amqp-node/amqplib/) is a popular client library that has been using
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a low `frame_max` default of `4096`. Its users must [upgrade to a compatible version](https://github.com/amqp-node/amqplib/pull/787)
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or explicitly use a higher `frame_max`.
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(starting with `0.10.7`) or explicitly use a higher `frame_max`.
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### MQTT
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@ -117,6 +117,14 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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#### Enhancements
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* Quorum queue log reads are now offloaded to channels (sessions, connections).
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In practical terms this means improved consumer throughput, lower interference of publishers
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on queue delivery rate to consumers, and improved CPU core utilization by each quorum queue
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(assuming there are enough cores available to the node).
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GitHub issue: [#12713](https://github.com/rabbitmq/rabbitmq-server/pull/12713)
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* Feature flag quality of live improvements.
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Certain required feature flags will now be automatically required on node boot
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@ -136,6 +144,22 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issue: [#12415](https://github.com/rabbitmq/rabbitmq-server/pull/12415)
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* Larger (up to 8192 bytes) [JWT tokens](https://www.rabbitmq.com/docs/oauth2) now can be used by AMQP 0-9-1 clients.
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Before a client connection can negotiate a maximum frame size (`frame_max`), it must authenticate
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successfully. Before the authenticated phase, a special lower `frame_max` value
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is used.
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Clients that do override `frame_max` now must use values of 8192 bytes or greater.
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We recommend using the default server value of `131072`: do not override the `frame_max`
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key in `rabbitmq.conf` and do not set it in the application code.
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[`amqplib`](https://github.com/amqp-node/amqplib/) is a popular client library that has been using
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a low `frame_max` default of `4096`. Its users must [upgrade to a compatible version](https://github.com/amqp-node/amqplib/pull/787)
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(starting with `0.10.7`) or explicitly use a higher `frame_max`.
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GitHub issue: [#13541](https://github.com/rabbitmq/rabbitmq-server/issues/13541)
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* AMQP 1.0 connections that use OAuth 2.0 now can renew their JWT tokens
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This allows clients to set a new token proactively before the current one [expires](/docs/oauth2#token-expiration), ensuring uninterrupted connectivity.
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If a client does not set a new token before the existing one expires, RabbitMQ will automatically close the AMQP 1.0 connection.
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@ -162,6 +186,24 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issue: [#13231](https://github.com/rabbitmq/rabbitmq-server/pull/13231)
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* Quorum queue checkpoint algorithm was tweaked to take checkpoints more frequently, thus
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clearing older segment files more aggressively.
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Workloads that use larger messages should continue following [the documented recommendations](https://www.rabbitmq.com/docs/quorum-queues#performance-tuning-large-messages) to
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avoid large disk space footprint of segment files.
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GitHub issue: [#13622](https://github.com/rabbitmq/rabbitmq-server/pull/13622)
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* Previously a node that was a cluster member but then was [reset](https://www.rabbitmq.com/docs/clustering#restarting-with-hostname-changes) could not
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rejoin the cluster if the [schema data store](https://www.rabbitmq.com/docs/metadata-store) was Mnesia.
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Now the reset node will try to leave the cluster and retry rejoining again.
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This was already the case for Khepri.
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Contributed by @SimonUnge.
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GitHub issue: [#13643](https://github.com/rabbitmq/rabbitmq-server/pull/13643)
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* Nodes will now fall back to system CA certificate list (if available) when no CA certificate
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is explicitly configured.
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@ -171,8 +213,6 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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* AMQP 1.0 and AMQP 0-9-1 connections now dynamically adjust their TCP socket buffers.
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GitHub issue: [#13363](https://github.com/rabbitmq/rabbitmq-server/pull/13363)
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* Peer discovery resilience improvements.
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@ -203,6 +243,14 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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#### Bug Fixes
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* Quorum queue leadership transfer could take several seconds longer than necessary to complete.
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GitHub issue: [#13190](https://github.com/rabbitmq/rabbitmq-server/pull/13190)
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* Quorum queue follow replica's last index could lag behind that of the leader.
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GitHub issue: [#13328](https://github.com/rabbitmq/rabbitmq-server/pull/13328)
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* AMQP 0-9-1 channel exception generator could not handle entity names (say, queue or stream names)
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that contained non-ASCII characters.
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@ -356,7 +404,7 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issue: [#12720](https://github.com/rabbitmq/rabbitmq-server/pull/12720)
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### Management UI
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### Management Plugin
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#### Breaking Changes and Deprecations
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@ -415,6 +463,30 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issues: [#13545](https://github.com/rabbitmq/rabbitmq-server/pull/13545), [#3478](https://github.com/rabbitmq/rabbitmq-server/issues/3478)
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* New health check commands help detect quorum queues without an elected leader.
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```
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# verifies all quorum queues across all virtual hosts
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GET /health/checks/quorum-queues-without-elected-leaders/all-vhosts/
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```
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```
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# verifies all quorum queues in the given virtual host
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GET /health/checks/quorum-queues-without-elected-leaders/vhost/{vhost}
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```
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```
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# verifies a subset of quorum queue that match the pattern across all virtual hosts
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GET /health/checks/quorum-queues-without-elected-leaders/all-vhosts/pattern/{pattern}
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```
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```
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# verifies a subset of quorum queue that match the pattern in the given virtual host
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GET /health/checks/quorum-queues-without-elected-leaders/vhost/{vhost}/pattern/{pattern}
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```
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Note that the values in the path must be percent-encoded, including the pattern.
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* Web app tab title now changes depending on the selected top-level tab.
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GitHub issue: [#13512](https://github.com/rabbitmq/rabbitmq-server/pull/13512)
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@ -438,6 +510,29 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issue: [#12818](https://github.com/rabbitmq/rabbitmq-server/pull/12818)
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### Stream Plugin
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#### Enhancements
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* Stream replication connections now can be configured to use IPv6 using `advanced.config`:
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```erl
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[
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{osiris, [
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{replica_ip_address_family, inet6}
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]}
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].
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```
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#### Bug Fixes
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* When a connection of one or more consumers in a [Single Active Consumer](https://www.rabbitmq.com/docs/streams#single-active-consumer) group failed,
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the group could try to activate (promote) one of the consumers are are no longer online. In practical terms
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this means that other consumers were not getting any deliveries.
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GitHub issue: [#13657](https://github.com/rabbitmq/rabbitmq-server/pull/13657)
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### OAuth 2 AuthN and AuthZ Plugin
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#### Breaking Changes and Deprecations
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@ -483,6 +578,15 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issue: [#12598](https://github.com/rabbitmq/rabbitmq-server/issues/12598)
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### LDAP Plugin
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#### Enhancements
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* The `in_group_nested` query now uses case-insensitive matching, which is more typical of the LDAP tooling.
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GitHub issue: [#13629](https://github.com/rabbitmq/rabbitmq-server/pull/13629)
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### Federation Plugin
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#### Enhancements
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@ -491,9 +595,21 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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GitHub issue: [#13115](https://github.com/rabbitmq/rabbitmq-server/pull/13115)
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#### Bug Fixes
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* Queue federation could cause a deadlock in a quorum queue replica process.
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GitHub issue: [#12713](https://github.com/rabbitmq/rabbitmq-server/pull/12713)
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### Shovel Plugin
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#### Enhancements
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* New Shovel metric: the number of forwarded messages.
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GitHub issue: [#13626](https://github.com/rabbitmq/rabbitmq-server/pull/13626)
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#### Bug Fixes
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* AMQP 0-9-1 channel exception generator could not handle entity names (say, queue or stream names)
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@ -600,11 +716,12 @@ This section can be incomplete and will be expanded as 4.1 approaches its releas
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### Dependency Changes
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* `ra` was upgraded to [`2.16.3`](https://github.com/rabbitmq/ra/releases)
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* `ra` was upgraded to [`2.16.6`](https://github.com/rabbitmq/ra/releases)
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* `osiris` was upgraded to [`1.8.6`](https://github.com/rabbitmq/osiris/releases)
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* `observer_cli` was upgraded to [`1.8.2`](https://github.com/zhongwencool/observer_cli/releases)
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* `eetcd` was upgraded to [`0.5.0`](https://github.com/zhongwencool/eetcd/releases)
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* `gun` was upgraded to [`2.1.0`](https://github.com/ninenines/gun/releases)
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* `credentials_obfuscation` was upgraded to [`3.5.0`](https://github.com/rabbitmq/credentials-obfuscation/releases)
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## Source Code Archives
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