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https://issues.apache.org/jira/browse/CAMEL-14789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Szczesiak updated CAMEL-14789:
-------------------------------------
    Attachment: 0001-CAMEL-14789-FIX-Automatic-recovery-of-temporary-repl.patch

> Automatic recovery of temporary reply queue is not handled correctly
> --------------------------------------------------------------------
>
>                 Key: CAMEL-14789
>                 URL: https://issues.apache.org/jira/browse/CAMEL-14789
>             Project: Camel
>          Issue Type: Bug
>          Components: camel-rabbitmq
>    Affects Versions: 2.25.0
>         Environment: * RabbitMQ server 3.8.3
>  * Erlang 22.3
>            Reporter: Robert Szczesiak
>            Priority: Major
>             Fix For: 2.25.1
>
>         Attachments: 
> 0001-CAMEL-14789-FIX-Automatic-recovery-of-temporary-repl.patch
>
>
> When Remote Procedure Call (RPC) communication pattern is used RabbitMQ Camel 
> component creates server-named auto-deleted temporary reply queue. Next, the 
> queue is bound to the exchange with routing key equal to queue name. 
> Likewise, ReplyManager's replyTo field is set with the value of the queue 
> name. Reply queue created in this manner is then reused for subsequent RPC 
> requests and message property rabbitmq.REPLY_TO is copied from the value 
> stored previously by ReplyManager.
> When some network error suddenly appears causing connection failure, 
> RabbitMQ's automatic recovery kicks in and tries to recover affected entities 
> (assuming the connection was created with automatic recovery enabled, which 
> is default.). As temporary quueues are auto-deleted, during recovery process 
> a new temporary queue is created which has a new name that differs from the 
> original one and here is where the problem begins.
> Creation of the new temporary queue is NOT detected by ReplyManager and 
> therefore replyTo property is NOT updated. Also, routing key no longer 
> matches queue name. This causes a problem when some implementations of 
> RabbitMQ client, like. Spring AMQP, are used server-site. RPC service 
> receives our request, processes it, and replies to default exchange with 
> routing key equal to rabbitmq.REPLY_TO sent in our request. RPC service 
> provider perceives no problem as response is sent successfully but RabbitMQ 
> Camel Component keeps awaiting for the response to arrive to the original 
> temporary queue which no longer exists due to connection failure and 
> recovery. Eventually, Camel throws ExchangeTimedOutException.
> Example:
>  # After automatic recovery, a RPC request is sent to example-exchange with 
> rabitmq.REPLY_TO=amq.gen-0lLvpnj4ZMlkhxZIcCPVpA
>  # After 20 seconds org.apache.camel.ExchangeTimedOutException is thrown:
> {code:java}
> The OUT message was not received within: 20000 millis due reply message with 
> correlationID: 
> Camel-ID-hostname-y579vjqenbwmcd1bpqmd5phtd-1583401848872-0-1690397 not 
> received on destination: amq.gen-0lLvpnj4ZMlkhxZIcCPVpA. 
> Exchange[ID-hostname-y579vjqenbwmcd1bpqmd5phtd-1583401848872-0-1690391]{code}
>  # Using RabbitMQ Management WebApp (rabbitmqctl) we check example-exchange's 
> bindings and see that routing key amq.gen-0lLvpnj4ZMlkhxZIcCPVpA now 
> corresponds to queue amq.gen-zaRCP-p-JbXeSzJmzSp83g
> *Proposed solution* is to add QueueRecoveryListener to notify when temporary 
> queue name changes due to recovery. On event, replyTo field will be updated 
> with the new temporary queue name and the queue will be rebound to the 
> exchange so that routing key matches queue name again. The change will be 
> made to org.apache.camel.component.rabbitmq.reply#createListenerContainer.
> The fix is ready to be delivered in pull-request/patch.



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