Build instructions for Tajo

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Requirements:

* Unix System
* JDK 1.8 or higher
* Maven 3.0 or higher
* Internet connection for first build (to fetch all Maven and Tajo dependencies)

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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           (Algebraic expressions)
         - tajo-catalog           (Catalog and its plugins)
         - tajo-common            (Common modules)
         - tajo-core              (Core module)
         - tajo-core-tests        (Tests for core module and query execution)
         - tajo-client            (Client API and its implementation)
         - tajo-client-example    (Client API examples)
         - tajo-dist              (Tajo distribution assembler)
         - tajo-docs              (User documentation)
         - tajo-jdbc              (Tajo JDBC Driver)
         - tajo-maven-plugin      (Maven Plugin)
         - tajo-metrics           (Metrics)
         - tajo-plan              (Plan representation)
         - tajo-pullserver        (Pullserver for intermediate)
         - tajo-rpc               (Rpc)
         - tajo-sql-parser        (SQL parser)
         - tajo-storage           (Storage and its plugins)

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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=2.7.1)
    * Currently, 2.3.0 or higher are supported.
  * Use -Dhbase.version to build with the specific hbase version (-Dhbase.version=0.98.7-hadoop2)
    * Currently, 0.98.x-hadoop2 or higher are tested.

 Tests options:
  * Use -DskipTests to skip tests when running the following Maven goals:
    'package',  'install', 'deploy' or 'verify'
  * -Dtest=<TESTCLASSNAME>,<TESTCLASSNAME#METHODNAME>,....
  * -Dtest.exclude=<TESTCLASSNAME>
  * -Dtest.exclude.pattern=**/<TESTCLASSNAME1>.java,**/<TESTCLASSNAME2>.java
  * For more information, refer to https://cwiki.apache.org/confluence/display/TAJO/Unit+Tests.

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Building distributions:

Create binary distribution

  $ mvn clean install -Pdist -DskipTests -Dtar -Dhadoop.version=2.X.X

You should substitute 2.X.X with your Hadoop version.

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