[rabbitmq-discuss] Errors starting RabbitMQ when cluster membership changes
tim at rabbitmq.com
Mon Oct 1 11:04:47 BST 2012
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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