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HRDBMS is a relational database for analytics/complex queries that is designed to handle large amounts of data and run across large clusters. The nodes in an HRDBMS cluster are divided into 2 types: coordinators nodes and workers nodes. The majority of the cluster will be made of worker nodes. These are the nodes that will actually store table data and do the majority of query processing. The remaining nodes are coordinator nodes. The coordinator nodes are responsible for accepting incoming requests from JDBC clients (no ODBC supported as of yet) and doing query planning and optimization. Your cluster must have at least 1 coordinator and 3 workers. You can have multiple coordinators if you choose. The main advantage of this is to be able to handle more clients, and (in the future) to provide HA for coordinators.
This Wiki covers how to build, install, configure, and start HRDBMS and discuss HRDBMS's SQL dialect and how to use the JDBC driver and CLI interface.