[rabbitmq-discuss] Errors starting RabbitMQ when cluster membership changes

Tim Watson tim at rabbitmq.com
Mon Oct 1 11:04:47 BST 2012

Hi Matt,

On 09/28/2012 08:23 PM, Matt Pietrek wrote:
> For example, at one point I had a three node cluster: play, play2, and 
> util. I then removed util from the cluster, although to be honest, 
> simply by changing the rabbitmq.config file, rather than explicitly 
> running rabbitmqctl stop_app while the cluster is still running.

I'm pretty sure you're not supposed to do that! :)

> My steps:
>   * Running as three node cluster, stop all brokers
>   * Create a new rabbitmq.config file with just two brokers
>   * Attempt to start the new cluster.

If you don't take util offline using the right procedure, I suspect 
mnesia will get out of sorts and this isn't something you want to 
happen. It's important to make cluster changes using the right 
procedure, as mnesia is rather a fussy beast.

BTW we've made some improvements that (hopefully) simplify working with 
clusters and these will be in the forthcoming feature release!

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