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Document RabbitMQ exclusive queue locator #249 #330

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25 changes: 25 additions & 0 deletions docs/modules/ROOT/pages/spring-cloud-bus/configuration.adoc
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Expand Up @@ -21,6 +21,31 @@ Stream documentation.

NOTE: If you have enabled https://docs.spring.io/spring-cloud-config/reference/client.html#config-first-bootstrap[config first bootstrap], you should place `spring.cloud.bus.destination` within your `bootstrap.[yaml | properties]` file or else if a refresh is triggered the value will be reset to the default.

[[rabbitmq-exclusive-queues]]
== RabbitMQ Exclusive Queues

The AMQP binder declares an exclusive, auto-delete queue per application instance.
With the default `spring.cloud.bus.destination`, those queues are named `springCloudBus.anonymous.*`.

CAUTION: A RabbitMQ policy that sets `queue-master-locator` (classic mirrored queues on 3.x) or `queue-leader-locator` to `min-masters` on every queue can stop a restarted service from redeclaring its Bus queue. The app then fails to start until the old exclusive queue is gone. Keep Bus queues client-local, for example with a higher-priority policy:

[source,json]
----
{
"vhost": "/",
"name": "spring_cloud_bus_client_local_queues",
"pattern": "^springCloudBus\\.anonymous\\..*",
"apply-to": "queues",
"definition": {
"queue-master-locator": "client-local"
},
"priority": 1
}
----

If you changed `spring.cloud.bus.destination`, match that name instead of `springCloudBus`.
Do not apply HA / mirroring policies to these exclusive queues.

[[tracing-bus-events]]
== Tracing Bus Events

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