[openstack-dev] [all][oslo.db][nova] TL; DR Things everybody should know about Galera

Matthew Booth mbooth at redhat.com
Tue Feb 10 14:47:23 UTC 2015


On 09/02/15 18:15, Jay Pipes wrote:
> On 02/09/2015 01:02 PM, Attila Fazekas wrote:
>> I do not see why not to use `FOR UPDATE` even with multi-writer or
>> Is the retry/swap way really solves anything here.
> <snip>
>> Am I missed something ?
> 
> Yes. Galera does not replicate the (internal to InnnoDB) row-level locks
> that are needed to support SELECT FOR UPDATE statements across multiple
> cluster nodes.
> 
> https://groups.google.com/forum/#!msg/codership-team/Au1jVFKQv8o/QYV_Z_t5YAEJ

Is that the right link, Jay? I'm taking your word on the write-intent
locks not being replicated, but that link seems to say the opposite.

Matt
-- 
Matthew Booth
Red Hat Engineering, Virtualisation Team

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