I have a privilege to work on a very interesting project called Halyard. It is an extremely horizontally scalable Triplestore with support for Named Graphs, designed for integration of extremely large Semantic Data Models, and for storage and SPARQL 1.1 querying of the whole Linked Data universe snapshots. Halyard implementation is based on Eclipse RDF4J framework and Apache HBase database, and it is completely written in Java.
Now I'm proud to share all the work with you. Halyard has been open sourced and you can see it on your own eyes here: https://github.com/Merck/Halyard
This is definitely not the end of the work, this is just the beginning :)