Apache Kylin
Apache Kylin is an open-source distributed analytics engine designed for big data environments, providing online analytical processing (OLAP) capabilities on Hadoop and Spark. It enables sub-second query performance on massive datasets by precomputing and storing aggregated results in a multi-dimensional cube model. Kylin integrates with popular BI tools like Tableau and Power BI, allowing users to perform interactive analytics on petabyte-scale data.
Developers should learn Apache Kylin when building data warehousing or business intelligence solutions that require fast, interactive queries on large-scale datasets, such as in e-commerce analytics, financial reporting, or IoT data analysis. It is particularly valuable in scenarios where traditional relational databases struggle with performance on big data, as it leverages Hadoop's scalability while providing OLAP-like query speeds through pre-aggregation.