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From Minto van der Sluis <>
Subject Re: Clustering
Date Mon, 22 Jul 2013 07:04:12 GMT
Hi Reto,

See below.



Op 19-7-2013 20:30, Reto Bachmann-Gmür schreef:
> Hi Minto
> Really curios to learn if things work with cellar.
Will keep you posted about my progress on this topic. Also I repeatedly
asked for open sourcing the stuff I worked on. Hopefully some day soon I
can show you the details.
> 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
> hosts.
> 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).
This one is very interesting. I will have a closer look at it.
> Cheers,
> Reto
> 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

ir. ing. Minto van der Sluis
Software innovator / renovator
Xup BV

Mobiel: +31 (0) 626 014541

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