[rabbitmq-discuss] stability of on-disk formats

Emile Joubert emile at rabbitmq.com
Tue May 14 10:10:09 BST 2013

Hi John,

On 13/05/13 22:29, John Beck wrote:
> That is whether the on-disk formats are generally compatible across
> upgrades or not.
Yes, the on-disk formats are generally stable across minor releases, and
whenever they do change brokers automatically upgrade the on-disk format
from as old as v2.1.1 when the broker starts up. One combination that
will not work is if an older broker (even post-v2.1.1) is booted with
the disk storage produced by a newer broker, where the disk storage
format of the newer broker is different.

In general the on-disk format is more likely to change across feature
releases (e.g. between v2.8.7 and v3.0.0) than minor releases (e.g.
v3.0.0 to v3.0.1)

You should take note of the clustering upgrade documentation in case of
a clustered environment:


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