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.
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