Andrew Onischuk created AMBARI-14739:
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             Summary: Capture package requirements that are optional and config 
dependent
                 Key: AMBARI-14739
                 URL: https://issues.apache.org/jira/browse/AMBARI-14739
             Project: Ambari
          Issue Type: Bug
            Reporter: Andrew Onischuk
            Assignee: Andrew Onischuk
             Fix For: 2.4.0
         Attachments: AMBARI-14739.patch

We need a general solution. A change to the stack definition to capture
package requirements that are optional and config dependent. Something in the
line of:

  * additional package - pkg_a
  * install if params.install_pkg_a is true
  * install_pkg_a is true if (some custom service specific condition is true)
  * both install() and start() commands need to check if install_pkg_a is true 
and then install the package (or remove from excluded package)
  * by default all additional packages are exluded





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