Kylin
is an open source Distributed Analytics Engine from eBay Inc。that provides SQL interface and multi-dimensional analysis (OLAP) on Hadoop supporting extremely large datasets
亮点
1.Compression and Encoding Support
2.Incremental Refresh of Cubes
3.Approximate Query Capability for distinct Count (HyperLogLog)
4.Leverage HBase Coprocessor for query latency
5.Job Management and Monitoring
6.Easy Web interface to manage, build, monitor and query cubes
7.Security capability to set ACL at Cube/Project Level
8.Support LDAP Integration
HyperLogLog：
原文：http://www.cnblogs.com/panpanwelcome/p/7896182.html