UnityJDBC - CumulusRDF

[Antonio Gallo]

Hi everybody, I'm currently involved in a project consisting in the creation of federated database system in Java for a particular use case. 

The dbs I’m interesting on are: MongoDB, Cassandra and CumulusRDF. The the tool I'm using for preform the database integration is UnityJDBC http://www.unityjdbc.com/. 

UnityJDBC can query any data source that has a JDBC driver, so my question is: Given that CumulusRDF relies on Cassandra and Cassandra has a JDBC driver, it would be possible to connect via JDBC to the instance of Cassandra where CumulusRDF and then perform some operation over the tables?

Thx, Antonio

[Andrea Gazzarini]

Hi Antonio,
most probably I miss some point of your use case (if so please correct me) but CumulusRDF is not an alternative to MongoDB and Cassandra...they sit on different layers of the application stack: Cassandra and MongoDB are backend storages, belonging to a layer that someone calls "datasource" or "integration" or simply: they are databases.
CumulusRDF is in the middle between the application and the datasource layer: it is basically an RDF adapter towards a NoSQL database (i.e. Cassandra).

So while the answer to your question could be yes, you can query the  Cassandra instance which is used by CumulusRDF, actually I think is pretty hard to think in that way because you will have to directly fight with CumulusRDF internal data model (which is usually abstracted by CumulusRDF itself)

Shortly, a horrible but simple example, it is not very precise but should give you an idea: if you know Drupal or Wordpress, you know that they are using a database, let's say MySql. Now,

- CumulusRDF is Wordpress
- Cassandra is MySql

So the problem here is that you cannot put Wordpress with MySql on the same level. of course you can use jdbc to query the mysql instance with wordpress data but in order to do that you must know the wordpress data model.

Best,
Andrea

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