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HADOOP INSTALL SERIES: 1. Install Java

2014-06-18 72 Dailymotion

Hadoop is written in Java, so you will need a recent Java Development Kit (JDK) installed <br />on the Ubuntu host. Perform the following steps to check the prerequisites: <br /> <br />1. First, check what's already available by opening up a terminal and typing <br />the following: <br />$ javac <br />$ java -version <br /> <br />2. If either of these commands gives a no such file or directory or similar <br />error, or if the latter mentions "Open JDK", it's likely you need to download the full <br />JDK. Grab this from the Oracle download page at http://www.oracle.com/ <br />technetwork/java/javase/downloads/index.html; you should get the <br />latest release. <br /> <br />3. Once Java is installed, add the JDK/bin directory to your path and set the <br />JAVA_HOME environment variable with commands such as the following, <br />modified for your specific Java version: <br /> <br />$ export JAVA_HOME=/usr/local/java/jdk <br />$ export PATH=$JAVA_HOME:$JAVA_HOME/bin:$PATH

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