Gaffer is a graph database framework. It allows the storage of very large graphs containing rich properties on the nodes and edges. Several storage options are available, including Accumulo, Hbase and Parquet. It is designed to be as flexible, scalable and extensible as possible, allowing for rapid prototyping and transition to production systems.

Gaffer - A large-scale entity and relation database supporting aggregation of properties

OpenTSDB is a distributed, scalable Time Series Database (TSDB) written on top of HBase.  OpenTSDB was written to address a common need: store, index and serve metrics collected from computer systems (network gear, operating
systems, applications) at a large scale, and make this data easily accessible and graphable.

OpenTSDB - A scalable, distributed Time Series Database.

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Gaffer - A large-scale entity and relation database supporting aggregation of properties

OpenTSDB - A scalable, distributed Time Series Database.

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Gaffer - A large-scale entity and relation database supporting aggregation of properties

OpenTSDB - A scalable, distributed Time Series Database.

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