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| 1 | +--- |
| 2 | +title: What's New in RabbitMQ 4.0 |
| 3 | +--- |
| 4 | +<!-- |
| 5 | +Copyright (c) 2024 Broadcom. All Rights Reserved. The term "Broadcom" refers |
| 6 | +to Broadcom Inc. and/or its subsidiaries. |
| 7 | +
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| 8 | +All rights reserved. This program and the accompanying materials |
| 9 | +are made available under the terms of the under the Apache License, |
| 10 | +Version 2.0 (the "License”); you may not use this file except in compliance |
| 11 | +with the License. You may obtain a copy of the License at |
| 12 | +
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| 13 | +https://www.apache.org/licenses/LICENSE-2.0 |
| 14 | +
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| 15 | +Unless required by applicable law or agreed to in writing, software |
| 16 | +distributed under the License is distributed on an "AS IS" BASIS, |
| 17 | +WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 21 | + |
| 22 | +import { |
| 23 | + RabbitMQServerVersion, |
| 24 | +} from '@site/src/components/RabbitMQServer'; |
| 25 | + |
| 26 | +import AmqpLogo from '@site/static/img/amqp-logo.svg'; |
| 27 | +import KhepriLogo from '@site/static/img/khepri-logo.svg'; |
| 28 | + |
| 29 | +# What's New in RabbitMQ 4.0 |
| 30 | + |
| 31 | +RabbitMQ 3.13 is a new release branch [published on 18 Sep |
| 32 | +2024](https://github.com/rabbitmq/rabbitmq-server/releases/tag/v4.0.1). <strong>RabbitMQ |
| 33 | +<RabbitMQServerVersion/></strong> is the latest patch release for this release |
| 34 | +branch. See the [Release Information section](/release-information) to learn |
| 35 | +more about all patch releases for this release branch. |
| 36 | + |
| 37 | +## AMQP 1.0 becomes a core protocol |
| 38 | + |
| 39 | +<figure className="without-borders" style={{float: "right"}}> |
| 40 | +<AmqpLogo className="floating-logo" style={{width: "100px", height: "100px",}}/> |
| 41 | +<figcaption>AMQP logo</figcaption> |
| 42 | +</figure> |
| 43 | + |
| 44 | +[AMQP 1.0 is now a core protocol](/blog/2024/08/05/native-amqp) that is always |
| 45 | +enabled. Its plugin is now a no-op that only exists to simplify upgrades. |
| 46 | + |
| 47 | +The AMQP 1.0 implementation is also significantly more efficient: its peak |
| 48 | +throughput is [more than double than that of |
| 49 | +3.13.x](/blog/2024/08/21/amqp-benchmarks) |
| 50 | + |
| 51 | +## Khepri now fully supported |
| 52 | + |
| 53 | +<figure className="without-borders" style={{float: "right"}}> |
| 54 | +<KhepriLogo className="floating-logo" style={{width: "100px", height: "175px",}}/> |
| 55 | +<figcaption>Khepri logo</figcaption> |
| 56 | +</figure> |
| 57 | + |
| 58 | +Khepri is a new backend for RabbitMQ’s metadata store. It was introduced as an |
| 59 | +experiment in RabbitMQ 3.13.0. It is now much more stable and efficient. That’s |
| 60 | +why it is now fully supported in the case of an issue. It will not be a blocker |
| 61 | +either to upgrade RabbitMQ in the future (unlike an upgrade from RabbitMQ |
| 62 | +3.13.x to 4.0.x with Khepri enabled which is unsupported). |
| 63 | + |
| 64 | +Users are encouraged to try it in their test environment with workloads as |
| 65 | +close as possible to the production before enabling it in production. |
| 66 | + |
| 67 | +Everything around Khepri is documented in the new [Metadata store |
| 68 | +section](./metadata-store). |
| 69 | + |
| 70 | +## Classic queue mirroring is removed |
| 71 | + |
| 72 | + |
| 73 | + |
| 74 | +After three years of deprecation, classic queue mirroring was completely |
| 75 | +removed in this version. [Quorum queues](./quorum-queues) and |
| 76 | +[streams](./streams) are two mature replicated data types offered by RabbitMQ |
| 77 | +4.x. Classic queues continue being supported without any breaking changes for |
| 78 | +client libraries and applications but they are now a non-replicated queue type. |
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