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| Introduction |
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| The main goal of Apache Tajo project is to build an advanced open source |
| data warehouse system in Hadoop for processing web-scale data sets. |
| Basically, Tajo provides SQL standard as a query language. |
| Tajo is designed for both interactive and batch queries on data sets |
| stored on HDFS and other data sources. Without hurting query response |
| times, Tajo provides fault-tolerance and dynamic load balancing which |
| are necessary for long-running queries. Tajo employs a cost-based and |
| progressive query optimization techniques for reoptimizing running |
| queries in order to avoid the worst query plans. |
