Env Variables for Applications in CDH5

The applications in CDH are installed by parcels, which is different with the normal package installation.

In CDH5, the installation path is /opt/cloudera/parcels/CDH-5.1.2-1.cdh5.1.2.p0.3/lib/

Just running "echo $HADOOP_HOME" will return empty. 

You can grab all the env variables from Cloudera Manager by the following steps.

1. Select any service, I will use HDFS for an example.

2. Select instances

3. Select a Datanode

4. Select "Processes"

5. Select "Stderr" 

6. This will give you the output of all the various components env variables.