Current state of the project + switching the Virtuoso Server ?

[Dan Borza]

Hi all,

I was wondering if there is any active development going on in the OpenIoT project.

I'm interested in trying to replace the existing data store (Virtuoso Server) with something else for some performance testing (something like Cassandra / CockroachDB). Do you guys think it's possible / worthwhile?

Thanks,

Dan.

[Dr. J. Martin Serrano - DERI]

Dear Dan Borza,

Many thanks for approaching us and your comments

At the moment we have an online version fo the OpenIoT aka "openIoTaaS”

(Open IoT as a Service), it shows the data collected at multiple locations (Open Data)

It is a demonstrator and Virtuoso (the triple store used) seems to be working well.

In which context you want to replace virtuoso?

Be aware Virtuoso is a RDBS or triple store, thus OpenIoT work with RDF Schema

If you want to replace virtuoso with NoSQL like Cassandra the full data model

Need to be re-implemented and RDF will not be supported.

I hope this information helps, looking for your comments

Kindest regards

Martin

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[Dan Borza]

Hi Martin,

Thanks for your reply, could you share a link to the OpenIoTAAS project? 

I'm trying to test the performance of IoT solutions having different data stores. Something like Cassandra seems like a good fit for write intensive applications. Indeed I noticed that there is a mismatch between Cassandra's model and Virtuoso's which might make my attempt fruitless in this regard. I was thinking that I could maybe use a subset of Virtuoso's functionality and map it on top of Cassandra, something simple, experimental in nature.

Currently I'm trying to build the client and server locally but running into the following exception, seems like the maven repository is down? Any good idea on how to get the code compiling?

[ERROR] Failed to execute goal on project lsm-light.client: Could not resolve dependencies for project org.openiot:lsm-light.client:jar:0.0.1: The following artifacts could not be resolved: javax.xml:xmldsig:jar:1.0, org.openiot:security.client:jar:0.0.1-SNAPSHOT: Could not transfer artifact javax.xml:xmldsig:jar:1.0 from/to jasig-repository (http://developer.ja-sig.org/maven2): Connect to developer.ja-sig.org:80 [developer.ja-sig.org/199.119.127.181] failed: Operation timed out -> [Help 1]

Thanks and have a wonderful weekend!

Dan.