[ovs-dev] RFC: OVN database options

[Ben Pfaff]

On Thu, Mar 10, 2016 at 07:11:55PM +0100, Ivan Kelly wrote:
> >     - Zookeeper.  The ZK model is similar to etc so it may have
> >       similar issues.  Also, ZK makes the transaction log available,
> >       for use by observer nodes to scale out reads, and this may be
> >       another way for the clients to track table changes.
> Not quite. It does make the log available in that there's nothing
> stopping you from connecting to the leader and reading the log and
> using it as you like, but it's not an officially supported usecase, so
> they don't actively encourage you to do it (they don't discourage
> either in fact).

OK.

> > The documentation I read for ZK talks about how it's often used to
> > manage pointers to other resources.  This implies, to my mind, that it's
> > not suitable for handling significant volumes of data but.  Is that a
> > true inference?
> Yes and No. Zookeeper is often used to point to larger data resources,
> but when they're talking large, they're talking HBase, HDFS, etc.
> Large data stores with multiple petabytes of data. In the case of OVN,
> I don't think it applies. It can easily handle at least a gig of data,
> and from your original email, I think we're talking a fraction of
> that.

I am reassured.  Thanks.