You can now consume DynamoDB as the storage backend for the newest version of the Titan graph engine,1.0.0. Titan 1.0.0 provides support for TinkerPop 3, as well as several bug fixes and optimizations. Tinkerpop 3 is the latest version of the Tinkerpop graph computing framework. For full list of updates in Titan 1.0.0 please see the release notes.
Source: amazon.com