Weaver is the first distributed transactional graph database, strong consistency is being achieved by using Hyperdex distributed storage.
There is not much information on how it is implemented, performance benchmarks are also a bit vague, but it states that Weaver performs several times faster than Titan and GraphLab. For pagerank-like benchmark (what does that mean?) Weaver performs slower.
It could be very intesting to try except that setting up Hyperdex is a pain. One has to start 3 different daemons with different configs, there are a bunch of scripts to support it and I do not know what will happen if one of them fails.
Weaver is in alpha stage so far, but looks interesting.
Let me dilute elliptics distributed storage (argh, this brings us money, how can we stop talking about it?) posts with some high-level abstract talk.
I have an interesting idea in mind to play with, and to switch brain into different thinking model I decided to play a bit with functional programming.
I used to work with LISP some time ago, but was never actually in FP world and Common LISP has horrible standard library – it is virtually empty, you have to implement just everything. In particular CLISP had quite por external library set either.
So I decided to learn Clojure a bit for fun – it has quite spectacular standard library, superb external projects repository and so many things from java world. I do not like java, but clojure looks interesting.
And it is faster than Python.
To play with my ideas (semantic relations and so on) I believe graph database is the best suit, so I decided to work with Neo4j and use Borneo connector. Is there any better choice, since it happened to be a non-trivial task for the newcomer like me.
If things will resolve successfully, I will definitely need for larger data sets we have in elliptics, so who knows, what we will build on top of it :)