View source for Building Hadoop CDH3

== Get The Source ==
* Cloudera Distribution of Hadoop (CDH3) - Download CDH3 from [http://www.cloudera.com Cloudera]. The source can be found in a [https://ccp.cloudera.com/display/SUPPORT/CDH3+Downloadable+Tarballs Tarball format].
== Software Prerequisites ==
The following software must be installed:
* Maven - on Ubuntu  this can be achieved by running:
 sudo apt-get install maven2
* zlib - on Ubuntu this can be achieved by running:
 sudo apt-get install zlib1g zlib1g-dev
* You need g++. on Ubuntu this can be achieved by running:
 sudo apt-get install g++
* Java 5 and 6. 
* You need Forrest, download a release from [http://forrest.apache.org/mirrors.cgi#how here]
* You need Xerces-C 2.8.x  
** Download it from [http://xerces.apache.org/xerces-c/download.cgi here] (3.1.x WILL NOT WORK!)
** Build/Install instructions [http://xerces.apache.org/xerces-c/build-2.html here]
** You can also download a binary distribution of Xerces-C. 
== Building ==
In order to build, run the following (after updating the variables with locations relevant for your machine):
 export JAVA_6_HOME_32=/usr/lib/jvm/java-6-sun
 export JAVA_5_HOME_32=/usr/lib/jvm/java-5-sun
 export CFLAGS=-m32
 export CXXFLAGS=-m32
 
 export JAVA_6_HOME=${JAVA_6_HOME_32}
 export JAVA_5_HOME=${JAVA_5_HOME_32}
 export XERCES_HOME=/home/cantor/hadoop-workspace/hadoop-libs/xerces-c_2_8_0-x86-linux-gcc_3_4/xerces-c
 export ECLIPSE_HOME=/usr/lib/eclipse
 export FORREST_HOME=/home/cantor/hadoop-workspace/hadoop-libs/apache-forrest-0.8
 ant -Dversion=cdh3.dev0 -Dcompile.native=true -Dcompile.c++=true -Dlibhdfs=1 -Dlibrecordio=true -Dxercescroot=${XERCES_HOME} -Declipse.home=${ECLIPSE_HOME} 
 -Dforrest.home=${FORREST_HOME} -Djava5.home=${JAVA_5_HOME} clean api-report tar test test-c++-libhdfs

The bash script is available here: https://www.cs.huji.ac.il/project/lawa/downloadables/cdh3-buildscript.sh