Apache Tajo

Tajo is a relational and distributed data warehouse system for Hadoop. Tajo is designed for low-latency and scalable ad-hoc queries, online aggregation and ETL on large-data sets by leveraging advanced database techniques. It supports SQL standards. It has its own query engine which allows direct control of distributed execution and data flow. As a result, Tajo has a variety of query evaluation strategies and more optimization opportunities. In addition, Tajo will have a native columnar execution and and its optimizer.

Build instructions for Tajo

Requirements:

• Unix System
• JDK 1.6 or higher
• Maven 3.0 or higher
• Protocol Buffers 2.5.0
• Internet connection for first build (to fetch all Maven and Tajo dependencies)

Maven main modules:

tajo (Main Tajo project)

     - tajo-project           (Parent POM for all Tajo Maven modules. )  
                              (All plugins & dependencies versions are defined here.)  
     - tajo-algebra  
     - tajo-catalog  
     - tajo-client  
     - tajo-common  
     - tajo-core  
     - tajo-docs  
     - tajo-jdbc  
     - tajo-project  
     - tajo-rpc  
     - tajo-storage  
     - tajo-dist              (Tajo distribution assembler)  

Maven build goals:

• Clean : mvn clean
• Compile : mvn compile
• Run tests : mvn test
• Run integrating tests : mvn verify
• Create JAR : mvn package
• Run findbugs : mvn compile findbugs:findbugs
• Install JAR in M2 cache : mvn install
• Build distribution : mvn package [-Pdist][-Dtar]

Build options:

• Use -Dtar to create a TAR with the distribution (using -Pdist)
• Use -Dhadoop.version to build with the specific hadoop version (-Dhadoop.version=2.3.0)

Tests options:

• Use -DskipTests to skip tests when running the following Maven goals: ‘package’, ‘install’, ‘deploy’ or ‘verify’
• -Dtest=,<TESTCLASSNAME#METHODNAME>,....
• -Dtest.exclude=
• -Dtest.exclude.pattern=**/.java,**/.java

Building distributions:

Create binary distribution

$ mvn package -Pdist -DskipTests -Dtar