==============================
A way to install Giraph/Hadoop
===============================

Prepare a (virtual) machine with Ubuntu 16.04.2 LTS installed.

Then, follow the instructions below (type or copy&paste the commands in bash).

* Installing OpenSSH server
sudo apt-get install openssh-server

* Installing public keys for SSH
ssh-keygen
# repeat hitting the Enter key

cat ~/.ssh/id_ras.pub > ~/.ssh/authorized_keys

* Installing Java 8 (Oracle)
sudo add-apt-repository ppa:webupd8team/java
sudo apt-get update
sudo apt-get install oracle-java8-installer

* Installing Hadoop 1.2.1 (pseudo distributed env. with localhost only)
cd
wget http://ftp.riken.jp/net/apache/hadoop/common/hadoop-1.2.1/hadoop-1.2.1.tar.gz
tar xvzf hadoop-1.2.1.tar.gz 
cd hadoop-1.2.1

cat << EOF > conf/core-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>$HOME/hdfs16/</value>
</property>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:54310</value>
</property>
</configuration>
EOF

cat << EOF > conf/hdfs-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>dfs.replication</name> 
<value>1</value> 
</property>
</configuration>
EOF

cat << EOF > conf/mapred-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>mapred.child.java.opts</name> 
<value>-Xmx8000m</value>
</property>
<property>
<name>mapred.job.tracker</name> 
<value>localhost:54311</value>
</property>
<property>
<name>mapred.tasktracker.map.tasks.maximum</name>
<value>4</value>
</property>
<property>
<name>mapred.map.tasks</name>
<value>4</value>
</property>
<property>
<name>mapreduce.job.counters.limit</name>
<value>5000000</value>
</property>
</configuration>
EOF

sed -i -e 's|.*JAVA_HOME=.*|export JAVA_HOME=/usr/lib/jvm/java-8-oracle/|' conf/hadoop-env.sh

bin/hadoop namenode -format

wget http://www.gutenberg.org/cache/epub/132/pg132.txt

bin/start-all.sh
bin/hadoop dfs -copyFromLocal pg132.txt /user/hduser/input/pg132.txt
bin/hadoop dfs -ls /user/hduser/input
bin/hadoop dfs -cat /user/hduser/input/pg132.txt

bin/hadoop jar hadoop-examples-1.2.1.jar wordcount /user/hduser/input/pg132.txt /user/hduser/output/wordcount

bin/hadoop dfs -cat /user/hduser/output/wordcount/p* | less

# If you can see a table of counts of words, it works well. 

* Instaling Giraph 1.2.0

sudo apt-get install git
sudo apt-get install maven

echo "export JAVA_HOME=/usr/lib/jvm/java-8-oracle/" >> ~/.bashrc
echo "export GIRAPH_HOME=~/giraph-1.2.0/" >> ~/.bashrc
exit

# open a new terminal, and continue

cd
wget http://ftp.jaist.ac.jp/pub/apache/giraph/giraph-1.2.0/giraph-dist-1.2.0-src.tar.bz2
tar xfvj giraph-dist-1.2.0-src.tar.bz2 
cd giraph-1.2.0
mvn package -DskipTests

cat << EOF > tiny_graph.txt
[0,0,[[1,1],[3,3]]]
[1,0,[[0,1],[2,2],[3,1]]]
[2,0,[[1,2],[4,4]]]
[3,0,[[0,3],[1,1],[4,4]]]
[4,0,[[3,4],[2,4]]]
EOF

~/hadoop-1.2.1/bin/hadoop dfs -copyFromLocal tiny_graph.txt /user/hduser/input/tiny_graph.txt
~/hadoop-1.2.1/bin/hadoop dfs -ls /user/hduser/input

~/hadoop-1.2.1/bin/hadoop jar $GIRAPH_HOME/giraph-examples/target/giraph-examples-1.2.0-for-hadoop-1.2.1-jar-with-dependencies.jar org.apache.giraph.GiraphRunner org.apache.giraph.examples.SimpleShortestPathsComputation -vif org.apache.giraph.io.formats.JsonLongDoubleFloatDoubleVertexInputFormat -vip /user/hduser/input/tiny_graph.txt -vof org.apache.giraph.io.formats.IdWithValueTextOutputFormat -op /user/hduser/output/shortestpaths -w 1


~/hadoop-1.2.1/bin/hadoop dfs -cat /user/hduser/output/shortestpaths/*

# If you can see the output like below (the shortest length for every vertex), it works well. 
#
# 0       1.0
# 1       0.0
# 2       2.0
# 3       1.0
# 4       5.0