INSTALL

To compile  Hadoop Mapreduce next following, do the following:

Step 1) Download Hadoop Common

svn checkout http://svn.apache.org/repos/asf/hadoop/common/branches/yahoo-merge/
ant veryclean mvn-install 

Step 2) Download Hadoop HDFS 

svn checkout http://svn.apache.org/repos/asf/hadoop/hdfs/branches/HDFS-1052/
ant veryclean mvn-install -Dresolvers=internal 

Step 3) Go to the root directory of hadoop mapreduce

Step 4) Run 

mvn clean install assembly:assembly
ant veryclean jar jar-test  -Dresolvers=internal 

In case you want to skip the tests run:

mvn clean install assembly:assembly -Dmaven.test.skip.exec=true
ant veryclean jar jar-test  -Dresolvers=internal 

You will see a tarball in
ls target/hadoop-mapreduce-1.0-SNAPSHOT-bin.tar.gz  

Step 5) Untar the tarball in a clean and different directory.
say HADOOP_YARN_INSTALL

To run Hadoop Mapreduce next applications :

Step 6) cd $HADOOP_YARN_INSTALL

Step 7) export the following variables:

HADOOP_MAPRED_HOME=
HADOOP_COMMON_HOME=
HADOOP_HDFS_HOME=
YARN_HOME=directory where you untarred yarn
HADOOP_CONF_DIR=
YARN_CONF_DIR=$HADOOP_CONF_DIR

Step 8) bin/yarn-daemon.sh start resourcemanager

Step 9) bin/yarn-daemon.sh start nodemanager

Step 10) Create the following symlinks in hadoop-common/lib 

ln -s $HADOOP_YARN_INSTALL/modules/hadoop-mapreduce-client-app-1.0-SNAPSHOT.jar .	
ln -s $HADOOP_YARN_INSTALL/modules/yarn-api-1.0-SNAPSHOT.jar .
ln -s $HADOOP_YARN_INSTALL/modules/hadoop-mapreduce-client-common-1.0-SNAPSHOT.jar .	
ln -s $HADOOP_YARN_INSTALL/modules/yarn-common-1.0-SNAPSHOT.jar .
ln -s $HADOOP_YARN_INSTALL/modules/hadoop-mapreduce-client-core-1.0-SNAPSHOT.jar .	
ln -s $HADOOP_YARN_INSTALL/modules/yarn-server-common-1.0-SNAPSHOT.jar .
ln -s $HADOOP_YARN_INSTALL/lib/protobuf-java-2.4.0a.jar .

Step 11) You are all set, an example on how to run a job is:

$HADOOP_COMMON_HOME/bin/hadoop jar $HADOOP_MAPRED_HOME/build/hadoop-mapred-examples-0.22.0-SNAPSHOT.jar randomwriter -Dmapreduce.job.user.name=$USER -Dmapreduce.randomwriter.bytespermap=10000 -Ddfs.blocksize=536870912 -Ddfs.block.size=536870912 -libjars $HADOOP_YARN_INSTALL/hadoop-mapreduce-1.0-SNAPSHOT/modules/hadoop-mapreduce-client-jobclient-1.0-SNAPSHOT.jar output