Kylin - Extreme OLAP Engine for Big Data

Apache Kylin is an open source Distributed Analytics Engine designed to provide SQL interface and multi-dimensional analysis (OLAP) on Hadoop supporting extremely large datasets, original contributed from eBay Inc. It is designed to reduce query latency on Hadoop for 10+ billions of rows of data. It offers ANSI SQL on Hadoop and supports most ANSI SQL query functions.
Its fundamental framework of Kylin OLAP Engine comprises of Metadata Engine, Query Engine, Job Engine and Storage Engine to run the entire stack. It also includes a REST Server to service client requests.