[rabbitmq-discuss] durability = true & auto delete = true

Tue Jul 1 15:41:26 BST 2014

Thanks Michael ..

Can you pl. help with the below ..

Also we are setting the TTL for the messages.. but our requirement is every client has a separate TTL for the messages … We want to check is there any option we can set when client creates the queues with    durability = true & auto delete = true

-----Original Message-----
From: Michael Klishin [mailto:mklishin at gopivotal.com] 
Sent: Tuesday, July 01, 2014 9:55 AM
To: PATAR, SAGAR; Legacy list about RabbitMQ
Subject: Re: [rabbitmq-discuss] durability = true & auto delete = true

On 1 July 2014 at 17:48:53, PATAR, SAGAR (sp345s at att.com) wrote:
> >
> durability = true & auto delete = true ??
>  
>  
> What will happen to the messages in the queue when a connection  
> is lost??

If the queue is exclusive, the durability attribute has no effect
because the queue will be deleted as soon as client disconnects
(or its connection is lost).

auto-deleted queues are deleted when the last consumer is cancelled
(or its channel is closed, or its connection is lost).
If there never was a consumer (e.g. you only use basic.get), it won't
be deleted.

Obviously, when a queue is deleted, all messages in it are also deleted. 

> Will the Queues be mirrored across the cluster .. what parameter  
> needs to be set to make them mirrored ??

http://www.rabbitmq.com/ha.html

> Also wanted to check if rabbit MQ generates a message ID which  
> is unique and sequential ?? and can be used in java code to identify  
> the point of failure?

RabbitMQ does not generate message ids that are exposed to clients. Do not rely
on delivery tags for anything.
--  
MK  

Staff Software Engineer, Pivotal/RabbitMQ