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CentOS 6 に Hadoop をインストールしてみる

ESXi 上で CentOS 6.5 x86_64 を使用

Java インストール

今回は jre を RPM でインストールする(jdk の方がいいのか?)
Linux x64 RPMをダウンロード

RPM インストール

 # wget -4 -P /usr/local/src/ [RPM_URL]
 # mv /usr/local/src/[RPM_URL] /usr/local/src/jre-7-linux-x64.rpm
 # rpm -ivh /usr/local/src/jre-7u65-linux-x64.rpm

環境変数設定(/etc/profile に追記)

export JAVA_HOME=/usr/java/default
export PATH=$PATH:$JAVA_HOME/bin

Hadoop インストール

SSH を鍵認証に変更しておく(/etc/ssh/sshd_config)

PasswordAuthentication no
 # /etc/init.d/sshd restart

hadoop ユーザー作成

 # groupadd hadoop
 # useradd -d /home/hadoop -g hadoop -m hadoop
 # passwd hadoop

公開鍵設定

 # mkdir /home/hadoop/.ssh
 # chmod 700 /home/hadoop/.ssh
 # ssh-keygen -t rsa -P '' -f /home/hadoop/.ssh/id_rsa
 # cp /home/hadoop/.ssh/id_rsa.pub /home/hadoop/.ssh/authorized_keys
 # chmod 600 /home/hadoop/.ssh/*
 # chown -R hadoop. /home/hadoop/.ssh

パスワードを聞かれずにログイン出来るか確認(hadoop ユーザーで)
shell-session
$ ssh localhost
$
$ exit

Hadoop をダウンロード

現在、2 系の RPM が無いため hadoop-2.4.1.tar.gz を使用する
console
# wget -4 -P /usr/local/src/ [Hadoop URL]

Hadoop 設置(今回は /usr/local/ に置く)
shell-session
# tar zxvf /usr/local/src/hadoop-2.4.1.tar.gz
# chown -R hadoop. /usr/local/src/hadoop-2.4.1
# mv /usr/local/src/hadoop-2.4.1 /usr/local/hadoop

環境変数設定(/etc/profile に追記)

export HADOOP_HOME=/usr/local/hadoop
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib"
export PATH=$PATH:$HADOOP_HOME/bin

Hadoop 設定

/usr/local/hadoop/etc/hadoop/core-site.xml
xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://[HOST]:9000</value>
</property>
</configuration>

/usr/local/hadoop/etc/hadoop/hadoop-env.sh(何故か JAVA_HOME を認識しないので、追記)
vim
export JAVA_HOME=/usr/java/default

/usr/local/hadoop/etc/hadoop/hdfs-site.xml
xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>

/usr/local/hadoop/etc/hadoop/mapred-site.xml
shell-session
# cp /usr/local/hadoop/etc/hadoop/mapred-site.xml.tmplate /usr/local/hadoop/etc/hadoop/mapred-site.xml

xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>[HOST]:9001</value>
</property>
</configuration>

/usr/local/hadoop/etc/hadoop/masters 作成
vim
localhost

/usr/local/hadoop/etc/hadoop/slaves 作成
vim
localhost

sh ファイルのパーミッション変更
shell-session
# chmod +x /usr/local/hadoop/etc/hadoop/*.sh

/etc/hosts に追記(ホスト名は example.com とする)
vim
[IP] example example.com localdomain

hadoop ユーザーで実行

HDFSのフォーマット
shell-session
$ hadoop namenode -format

Hadoopの起動
shell-session
/usr/local/hadoop/sbin/start-all.sh

Webコンソールで確認

http://[HOST]:50070 にアクセスし、表示されれば完了

追記(何かエラー出てる)

jdk に変えて、とりあえず動かしてみたら
text
WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
WARN conf.Configuration: file:/tmp/hadoop-hadoop/mapred/staging/hadoop429899473/.staging/job_local429899473_0001/job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.
WARN conf.Configuration: file:/tmp/hadoop-hadoop/mapred/staging/hadoop429899473/.staging/job_local429899473_0001/job.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.
WARN conf.Configuration: file:/tmp/hadoop-hadoop/mapred/local/localRunner/hadoop/job_local429899473_0001/job_local429899473_0001.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.retry.interval; Ignoring.
WARN conf.Configuration: file:/tmp/hadoop-hadoop/mapred/local/localRunner/hadoop/job_local429899473_0001/job_local429899473_0001.xml:an attempt to override final parameter: mapreduce.job.end-notification.max.attempts; Ignoring.

こんなの出るし、解析結果 0 バイトで空だし・・・
どうしようか・・・

さらに追記

サンプルを動かしてみる

hadoop ユーザーで以下を実行
shell-session
$ hadoop jar /usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.4.1.jar wordcount /input output.wordcount
$ hadoop fs -cat /user/hadoop/output.wordcount

おー、サンプル動いた!
input に置いたテキストから単語出現回数が表示された

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