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From Sébastien Launay <sebastien.lau...@anyware-tech.com>
Subject Re: Jackrabbit with Mysql Cluster
Date Fri, 20 Mar 2009 13:24:04 GMT

I personally  encounter problems with NDBCluster table because JR database
model relies on blob and blobs are not well managed with NDB.
Indeed, there are read locks with blobs which throws exceptions when you
many concurrent access to the repository as the read lock can not be

But, i do not think this is the same errors you are talking about.

Only InnoDB works for us as it is transactional and therefore allow locking
of the journal table (instead of MyISAM) and therefore permit safe
between Jackrabbit nodes.
But for high availability, you need to add redundancy and for this we
used two
mysql instances with DRBD and LVS.

Best regards,

majohnst a écrit :
> Has anyone used Jackrabbit using a Mysql Cluster as the database? This is not
> a mysql master/slave setup, but a true mysql ndb cluster. I currently have a
> jackrabbit cluster setup where there are 7 webservers (each a jackrabbit
> cluster node) and 3 database servers (in a mysql cluster).  In development,
> our jackrabbit cluster was running fine with several webservers connecting
> to a single regular mysql instance. Once we moved our code to our final
> production setup (with the mysql cluster), we keep getting weird database
> errors and I am trying to figure out if jackrabbit is causing the problems
> or if it something else. The errors we get are very non-descript, like
> "unknown ndbcluster error". But it looks like something is closing database
> connections because jackrabbit often loses the db connection and cannot
> reconnect.
> I was hoping that someone would have experience with a similar setup and
> could offer any tips.
Sébastien Launay

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