Hadoop 1.2.1 Installation Note 02:java installation

• Use FTP or online wget to obtain the JDK installation package, placed in the newly created/usr/java directory, unzip the installation

[email protected] java]$ sudo tar-zxvf jdk-7u65-linux-x64.gz

• Configuring Java parameters in the/etc/profile

# JAVA Environment Export Java_home=/usr/java/jdk1.7.0_65export classpath=.: $CLASSPATH: $JAVA _home/lib: $JAVA _home/ Jre/libexport path= $PATH: $JAVA _home/bin: $JAVA _home/jre/bin

• Update Profile Validation Java version

[Email protected] java]$ source/etc/profile [[email protected] java]$ java-version java version "1.7.0_45" OpenJDK Runt IME Environment (rhel-2.4.3.3.el6-x86_64 u45-b15) OpenJDK 64-bit Server VM (build 24.45-b08, Mixed mode)

Also install Java in slaves, configure Etc/profile and update, check the version is correct

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