[rabbitmq-discuss] Regarding disk free limit

Emile Joubert emile at rabbitmq.com
Tue Aug 27 14:14:10 BST 2013


On 27/08/13 13:58, Jain, Punit wrote:
> we are also not using message persistence.

Messages could still be written to disk even if it is not required.

> This system is an upstream for another broker configured in
> federation. I think only incase of link failure messages are expected
> to queued up in upstream queue which will be in memory in my 
> understanding, right?

If the consumers are guaranteed always to be faster than the publishers
then queues will never need to hold any messages. In your case the queue
will grow as a result of link failure.

> Still, is there any way RabbitMQ occupying disk space? Currently we
> have around 1GB free space in root partition which will not be used
> by any software or user.

The broker may decide to start paging messages to disk when a relatively
small percentage of RAM is in use. 8Mb is a pretty slim safety margin.
You should weigh the cost of recovering from a crash against the cost of
extra disk space.


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