[Openstack-operators] Galera setup testing

Fox, Kevin M Kevin.Fox at pnnl.gov
Tue Dec 8 02:56:55 UTC 2015

Awsome news. Should there be a tag added for gallera multimaster safe to let us ops know about these things?


From: Kevin Benton
Sent: Monday, December 07, 2015 6:08:12 PM
To: Matteo Panella
Cc: OpenStack Operators
Subject: Re: [Openstack-operators] Galera setup testing

Neutron has protection against these now as of liberty with API level retry operations so this shouldn't be a problem for neutron any more.

On Dec 7, 2015 4:06 PM, "Matteo Panella" <matteo.panella at cnaf.infn.it<mailto:matteo.panella at cnaf.infn.it>> wrote:
On 2015-12-07 22:45, James Dempsey wrote:
+1 for designating one node as primary.  This helped us reduce some
deadlocks that we were seeing when balancing sessions between DB hosts.

Keystone most likely won't be affected by writeset certification failures,
but other services (especially Neutron) are going to be hit by one sooner
or later.

Unfortunately, Galera doesn't take very kindly "SELECT ... FOR UPDATE", so
you can't really do proper load balancing (aside from designating a different node
as master in multiple listen stanzas, each one for a different set of services).

Matteo Panella
Via Ranzani 13/2 c - 40127 Bologna, Italy
Phone: +39 051 609 2903<tel:%2B39%20051%20609%202903>

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