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From Reto Bachmann-Gmür <>
Subject Re: Clustering
Date Fri, 19 Jul 2013 18:30:00 GMT
Hi Minto

Really curios to learn if things work with cellar.

I didn't know about the possibility to use cluster a TDB store. But a
2008 paper seems to be doing (or investigating) exactly this.

For web applications with many reads and few writes I would suggest
adding some clustering at the HTTP level. With GET requests being
forwarded to any host in a pool and POST/PUT being forwarded to all

As for clustering triple stores it seems virtuoso supports this. And
for virtuoso there is Enrico Daga's clerezza binding (to which
fastlane should probably be added).


On Fri, Jul 19, 2013 at 3:09 PM, Minto van der Sluis <> wrote:
> Hi Folks,
> Next issue I have to tackle on my assignment is Clustering. Basically I
> have 2 issues right now:
> 1) Running my assembly clustered
> This seems to be the easy one, since I am using Apache Karaf for
> building my assembly/distribution. Karaf has a subproject called Cellar
> for clustering. Here just have to dive in a get it done.
> 2) Having a cluster aware datastore (Jena TDB)
> Googling around leaves me clueless. Sometimes it appears TDB can be used
> in clustered environments others it appear it can't. I sure couldn't
> find any recipe how to get it done. I should probably ask this on the
> Jena mailing list, but I am trying this one first since you guys seem to
> have quite some experience with TDB.
> I am wondering if I can really use TDB in a clustered setup or if need
> to switch to another datastore to accomplish this. Probably SDB can be
> used for this but I fear a performance penalty.
> Any thoughts?
> Regards,
> Minto

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