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Cassandra is turning out to be one killer data backend. It's really exciting to see what's being built on top of it.

Hadoop, Solr/Lucene, and now Blueprints/Grapb DB operations are all available on the same Cassandra cluster, in addition to the stuff Cassandra does quote-unquote natively. Add Zookeeper for the few times you need an honest-to-goodness transaction and it's just crazy how good the tech has gotten on the backend in the last 10 years. :-)

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Absolutely, without NoSQL solutions like Cassandra Titan would not be possible.

Regarding Zookeeper: We actually build a locking system into Titan that uses quorum reads/writes with time-outs and cleanup to ensure consistency for certain edge/property types as defined inside Titan. This gives you consistency guarantees out of the box without having to introduce another component (like Zookeeper) into your deployment. For infrequent lock usage (which I strongly encourage ;-) this should be sufficient. For frequent locking, something like Zookeeper is far superior.

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