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I'd look at what Keystone did fronting the various Key Value stores woth 
Dogpile.  Then the same APi from Keystone can be backed by any Dogpile 
implementation.  We support Reddis, Memcached, with Cassandra and Mongo 
both somewhere in there (not certain their state)



On 08/16/2014 02:28 AM, Martinx - ????? wrote:
> BTW, why not Cassandra, instead of Mongo?! It seems pretty solid...
>
>
> On 16 August 2014 02:44, Robert van Leeuwen 
> <Robert.vanLeeuwen at spilgames.com 
> <mailto:Robert.vanLeeuwen at spilgames.com>> wrote:
>
>     From what I have seen and heard MySQL simply won't be able to
>     handle it speed wise.
>     You might be able to get a very, very small cluster to run on MySQL.
>     This will be less of an issue with Mongo since writes are faster
>     with Mongo.
>
>     I wonder if anyone runs a cluster of some size with ceilometer
>     though. (And what they use)
>     During a poll at the operators meetup there was no one running it
>     properly in production due to performance issues..
>
>     We decided we only wanted to have some graphs of instances and do
>     not need other functionality so we build a plugin to put it in
>     graphite: http://engineering.spilgames.com/using-ceilometer-graphite/
>
>     Cheers,
>     Robert van Leeuwen
>
>     Sent from my iPad
>
>     > On 16 aug. 2014, at 02:14, "Guillermo Alvarado"
>     <guillermoalvarado89 at gmail.com
>     <mailto:guillermoalvarado89 at gmail.com>> wrote:
>     >
>     > Hello,
>     >
>     > I am wondering why Ceilometer uses MongoDB instead MySQL or some
>     relational database?
>     >
>     > What are the advantages of use MongoDB in this specific case?
>     >
>     > Thanks.
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