JanusGraph is a highly scalable graph database optimized for storing and querying large graphs with billions of vertices and edges distributed across a multi-machine cluster. JanusGraph is a transactional database that can support thousands of concurrent users, complex traversals, and analytic graph queries.
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  <li>Elastic and linear scalability for a growing data and user base.</li>
  <li>Data distribution and replication for performance and fault tolerance.</li>
  <li>Multi-datacenter high availability and hot backups.</li>
</ul>

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

JanusGraph - Distributed graph database

Hector is a high level Java client for Apache Cassandra. Apache Cassandra is a highly available column oriented database. Hector provides Object oriented interface, Failover, Connection pooling, JMX, Basic Load Balancing and lot more.

Hector - Java client for Apache Cassandra

Hawkular Metrics is a metrics collection, aggregation, visualization framework. Hawkular is a set of Open Source projects designed to be a generic solution for common monitoring problems. The Hawkular projects provide REST services that can be used for all kinds of monitoring needs. The aim is to provide a generic solution that can be used for common monitoring problems.
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The main goal of the Hawkular organization is to provide tools to monitor, view, predict, and guide you to make informed decisions about deployed applications and infrastructure. Anyone looking for Java-based components for alerting, metric storage, or distributed tracing should be interested in Hawkular.

Hawkular Metrics is a metrics collection, aggregation, visualization framework. Hawkular is a set of Open Source projects designed to be a generic solution for common monitoring problems. The Hawkular projects provide REST services that can be used for all kinds of monitoring needs. The aim is to provide a generic solution that can be used for common monitoring problems.


Hawkular metrics - Time Series Metrics Engine based on Cassandra

A JPA 2.0 compliant Object-Datastore Mapping Library for NoSQL Datastores. The idea behind Kundera is to make working with NoSQL Databases drop-dead simple and fun. Currently it supports Cassandra, MongoDB, HBase and   Relational databases.


Kundera - JPA 1.0 ORM library for the Cassandra/Hbase/MongoDB database.

Heroic is a scalable time series database based on Bigtable, Cassandra, and Elasticsearch.  It is an open-source monitoring system originally built at Spotify to address the problems that were facing with large scale gathering and near real-time analysis of metrics. 

Heroic - The Time Series Database

Elassandra is a fork of Elasticsearch modified to run as a plugin for Apache Cassandra in a scalable and resilient peer-to-peer architecture. Elasticsearch code is embedded in Cassanda nodes providing advanced search features on Cassandra tables and Cassandra serve as an Elasticsearch data and configuration store. It supports Cassandra vnodes and scales horizontally by adding more nodes.
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Elassandra supports Full-text search, Spatial search, Real-time aggregation on your Cassandra data. Elassandra is a sharded multi-master database, where Elasticsearch is sharded master-slave, Thus, Elassandra has no Single Point Of Write, helping to achieve high availability.

Elassandra is a fork of Elasticsearch modified to run as a plugin for Apache Cassandra in a scalable and resilient peer-to-peer architecture. Elasticsearch code is embedded in Cassanda nodes providing advanced search features on Cassandra tables and Cassandra serve as an Elasticsearch data and configuration store. It supports Cassandra vnodes and scales horizontally by adding more nodes.

Elassandra - Elasticsearch + Apache Cassandra

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JanusGraph - Distributed graph database

Hector - Java client for Apache Cassandra

Hawkular metrics - Time Series Metrics Engine based on Cassandra

Kundera - JPA 1.0 ORM library for the Cassandra/Hbase/MongoDB database.

Heroic - The Time Series Database

Elassandra - Elasticsearch + Apache Cassandra

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Projects

JanusGraph - Distributed graph database

Hector - Java client for Apache Cassandra

Hawkular metrics - Time Series Metrics Engine based on Cassandra

Kundera - JPA 1.0 ORM library for the Cassandra/Hbase/MongoDB database.

Heroic - The Time Series Database

Elassandra - Elasticsearch + Apache Cassandra

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