Hadoop and tdp-cluster vars distinction

[gonzaloetjo]

Certain variables declared inhadoop.yml are used by other services thanks to the plugin resolve.py. Same thing ocures with vars declared in tdp-cluster.

The decision remains to be done as to which variables should be on tdp_default_vars/hadoop.yml or in tdp_default_vars/tdp_cluster.yml.

A specific example would be java_home currently declared in hadoop vars.

My take:

• Variables tdirectly dependent on the hadoop version used -> tdp_default_vars/hadoop.yml
• Variables related to the specific deployment, and independent of Hadoop version -> tdp_default_vars/tdp_cluster.yml

If agreed they should be distributed accordingly.