On 2011-07-14 12:55, RNZ wrote: > > > On Thu, Jul 14, 2011 at 2:02 PM, Florian Haas <[email protected] > <mailto:[email protected]>> wrote: > > On 2011-07-14 08:46, RNZ wrote: > > No, I want and I need - multi-master scheme (more then two nodes)... > > There is nothing in Pacemaker's master/slave scheme that restricts you > to a single master. The ocf:linbit:drbd resource agent, for example, is > configurable in dual-Master mode. > > Once the resource agent properly implements the functionality (the hard > part), configuring a multi-master master/slave set is simply a question > of setting the master-max meta parameter to a value greater than 1 (the > easy part). > > I don't think so... Couchdb RESTful API very easy allow running > repliacate by next scheme:
It's entirely possible that the couchdb native API may be more powerful
in specific regards, but if you want to put it into a Pacemaker cluster
you may have to occasionally accept some minor limitations. That's a
tradeoff which is present for all Pacemaker managed applications.
> primitive cdb0
> hostA: hostB:dbB > localhost:dbB
> hostA: hostC:dbC > localhost:dbC
> hostA: hostD:dbD > localhost:dbD
> primitive cdb1
> hostB: hostA:dbB > localhost:dbB
> primitive cdb2
> hostC: hostA:dbC > localhost:dbC
>
> In this scheme hostA used as master for hostB and hostC (master-master)
> and as slave for hostD (slave-master). Both (master-master and
> slave-master for different servers/databases) scheme per one instance.
So you mean there would be a cascading replication, like so:
hostD
|
hostA
/ \
hostB hostC
Such a thing is not something Pacemaker caters for specifically, but I
dare say it doesn't need to, either. You would simply create one
master/slave set where D is master and A is slave, and another where A
is master and B and C are slaves.
> By the way, is there any specific reason you are contributing under a
> pseudonym? It's highly unusual in this community to do so.
>
>
> Sorry, habit... My real name Alibek.Amaev, [email protected]
> <mailto:[email protected]> or [email protected]
> <mailto:[email protected]>
Pleased to meet you Alibek, welcome to the tribe. :)
Cheers,
Florian
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