Kylin

A distributed analytics engine that provides a SQL interface and multi-dimensional analysis (OLAP) on Hadoop supporting extremely large datasets. 

First released2014
Developed byeBay (now it's a project of the Apache Software Foundation)
Latest stable versionKylin 4
Open-sourceYes
Used byeBay, DreamSoft, Meizu

Interesting facts

Kylin is designed to reduce query latency on Hadoop for 10+ billions of rows of data,

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