Titan (https://github.com/thinkaurelius/titan) is an example of a blueprints stack graph implementation that works over HBase or Cassandra. The distinct limitation/restriction is that it supports vertex-oriented queries, i.e. constrained to subgraphs. To do full-graph queries/analysis, you use Fanus, a related project, that implements your query as a map-reduce job that leverages the Hadoop-HBase connection. I think that gives some hints to the limitations and challenges of building generalized graph query over HBase.
Dom On Wed, Jul 24, 2013 at 1:01 AM, Claude Warren <cla...@xenei.com> wrote: > I have seen a number of papers describing efforts and issues in using noSQL > type DB for triple storage. > > There may be more information at http://SemanticWeb.org or > http://answers.SemanticWeb.com but I have not actively searched. > > Claude > > > On Wed, Jul 24, 2013 at 8:38 AM, Andy Seaborne <a...@apache.org> wrote: > > > On 23/07/13 19:57, Mgs Mgs wrote: > > > >> Hi Devs > >> > >> Are there any plans to integrate Jena and HBase ? > >> > >> > >> > >> > >> Regards, > >> Oleg > >> > > > > What are you trying to do? > > > > Not hear of anyone working on it. Being an open source project, someone > > somewhere might be trying. > > > > Just as SPARQL over SQL/JDBC has issues, so using HBase will not be > > simple. It's not even got the features of the DBs supported by SDB so > > joins, or something with the same effect as, will need to be provided. > > > > HBase is designed for billions of rows and millions of columns, key (and > > secondary index) accessed. That's different to RDF so the mapping isn't > > straightforward. There are choices. > > > > Andy > > > > > > -- > I like: Like Like - The likeliest place on the web< > http://like-like.xenei.com> > Identity: https://www.identify.nu/user.php?cla...@xenei.com > LinkedIn: http://www.linkedin.com/in/claudewarren >
