JanusGraph

JanusGraph is a highly scalable graph database for storing and querying graphs with billions of vertices and edges distributed across a multi-machine cluster. It is transactional and supports thousands of concurrent users, complex traversals, and analytic graph queries.

Graph access goes through Apache TinkerPop and the Gremlin query language. Rather than ship its own storage engine, JanusGraph layers over distributed backends such as Cassandra, HBase, and Bigtable, with full-text search and indexing through Elasticsearch and Solr. A web-based visualizer ships alongside support for third-party tools like Cytoscape, Gephi, and Graphlytic.

JanusGraph runs in production at companies including eBay, Netflix, and Uber, and powers projects such as Apache Atlas. It is developed as a vendor-neutral project under the LF AI and Data Foundation and distributed under the Apache 2.0 license.