OLAP引擎

1. Presto/Hive/Spark on ORC File
2. HBase二级索引
3. Druid
4. ElasticSearch
5. Kylin

参考：

1. https://metamarkets.com/2014/building-a-data-pipeline-that-handles-billions-of-events-in-real-time/
2. https://metamarkets.com/2015/simplicity-stability-and-transparency-how-samza-makes-data-integration-a-breeze/
3. Druid: http://www.oscon.com/oscon2014/public/schedule/detail/34076

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