I like DynamoDB as a target for this sort of thing. There are many tasks which are small-scale yet critical where it would otherwise be hard to provide a distributed and reliable database. Put that together with Lambda, which does the same for computation, and you are cooking with gas.
I wrote a 1-1 translation of DynamoDB documents to RDF that I use throughout an application; the code is DynamoDB idiomatic in every way, just the application reads and writes (a constrained set of) RDF documents. Right now I dump the documents from the DynamoDB system into a triple store when I want a panoptic view, but with a distributed graph like that would mean being able to run SPARQL queries against DynamoDB directly. There are many products in the same family as Cassandra and DynamoDB and it would be good to think through the math so we can approach them all in a similar way. -- Paul Houle paul.ho...@ontology2.com On Mon, Oct 17, 2016, at 12:31 PM, A. Soroka wrote: > Yep, > > http://iswc2011.semanticweb.org/fileadmin/iswc/Papers/Workshops/SSWS/Ladwig-et-all-SSWS2011.pdf > > indicates that they are indexing by subject. As someone who has > implemented LDP, that is definitely the approach that makes sense there. > > --- > A. Soroka > The University of Virginia Library > > > On Oct 17, 2016, at 12:20 PM, Andy Seaborne <a...@apache.org> wrote: > > > > IIRC It stores CBDs indexed by subject so it is the "other" model to Rya. > > Better for LDP (??). > > > > Andy > > > > On 17/10/16 15:41, A. Soroka wrote: > >> There's also: > >> > >> https://github.com/cumulusrdf/cumulusrdf > >> > >> in a similar vein (RDF over Cassandra). Not sure what kind of particular > >> uses it expects to support. > >> > >> --- > >> A. Soroka > >> The University of Virginia Library > >> > >>> On Oct 17, 2016, at 7:02 AM, Andy Seaborne <a...@apache.org> wrote: > >>> > >>> Hi Claude, > >>> > >>> There is certainly interest from me. > >>> > >>> What the best thing to do depends on various factors. By putting it in > >>> extras I presume you mean it gets added to the release? That is not the > >>> only way forward. > >>> > >>> An important aspect of Apache is "Community over code" - will there be a > >>> community around this code? Is that community the same, or significant > >>> overlap, as the Jena community? > >>> > >>> There are various reasons for wanting RDF over a column store - which use > >>> cases are the most important for this work? > >>> > >>> They lead to different ways of using Cassandra. For example, > >>> Rya(incubating) uses Accumulo tables as indexes, and partial scans of the > >>> table is streaming. Other systems try to use the columns for properties, > >>> possibly more useful for LDP style than SPARQL. > >>> > >>> Andy > >>> > >>> On 15/10/16 18:38, Claude Warren wrote: > >>>> Howdy, > >>>> > >>>> We have a project at work that is implementing Jena Graph on Cassandra. > >>>> I > >>>> am wondering if there is enough interest here to accept it as a > >>>> contribution. I was thinking that it might fit in the Extras category. > >>>> > >>>> I can not promise release of the code yet as I have to present it to our > >>>> internal Intellectual Property group first. > >>>> > >>>> Thoughts? > >>>> > >>>> Claude > >>>> > >> >
