Hadoop 2.x on ubuntu

http://codesfusion.blogspot.com/2013/10/setup-hadoop-2x-220-on-ubuntu.html
http://codesfusion.blogspot.com/2013/11/hadoop-2x-core-hdfs-and-yarn-components.html
http://hadoop.apache.org/docs/stable/hadoop-project-dist/hadoop-common/ClusterSetup.html#Web_Interfaces

  Almost the same thing as 1.x, but need to set some environment variables... use start-all.sh/stop-all.sh is fine

$cd ~
$vi .bashrc

paste following to the end of the file

#Hadoop variables
export JAVA_HOME=/usr/lib/jvm/jdk/
export HADOOP_INSTALL=/usr/local/hadoop
export PATH=$PATH:$HADOOP_INSTALL/bin
export PATH=$PATH:$HADOOP_INSTALL/sbin
export HADOOP_MAPRED_HOME=$HADOOP_INSTALL
export HADOOP_COMMON_HOME=$HADOOP_INSTALL
export HADOOP_HDFS_HOME=$HADOOP_INSTALL
export YARN_HOME=$HADOOP_INSTALL
###end of paste

$ cd /usr/local/hadoop/etc/hadoop
$ vi hadoop-env.sh

#modify JAVA_HOME
export JAVA_HOME=/usr/lib/jvm/jdk/

# run grep example...