Working With Hadoop: localhost: Error: JAVA_HOME is not set

Question

I\'m working with Ubuntu 12.04 LTS.

I\'m going through the hadoop quickstart manual to make a pseudo-distributed operation. It seems simple and straightforward (eas

Answer 1

extract from etc/hadoop/hadoop-env.sh

The only required environment variable is JAVA_HOME. All others are optional. When running a distributed configuration it is best to set JAVA_HOME in this file, so that it is correctly defined on remote nodes.

This means its better and advised to set JAVA_HOME here.. even though the existing definition reads the JAVA_HOME variable. Perhaps its not getting the value of JAVA_HOME from previously set value... standard apache manual does not tell this :( :(