[jira] [Created] (AMBARI-20561) Need mechanism to add one of a set of services as required in metainfo.xml file.

["Christopher Jackson (JIRA)" <ji...@apache.org>]

Christopher Jackson created AMBARI-20561:
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             Summary: Need mechanism to add one of a set of services as required in metainfo.xml file. 
                 Key: AMBARI-20561
                 URL: https://issues.apache.org/jira/browse/AMBARI-20561
             Project: Ambari
          Issue Type: Story
            Reporter: Christopher Jackson


It appears that HDP 2.6 will support both Spark1 and Spark2. It will allow these services
to be installed side by side and an environment variable will determine which is used when a process
that needs spark is run.

Services have a metainfo.xml file which they can list other services which are required for
their service to function properly. If a service required Spark (any version) how would they
define this in the metainfo.xml file? For instance I wouldn’t want the following as it would
imply that both Spark 1.x and Spark 2.x had to be installed:
{code}
<requiredServices>
  <service>SPARK</service>
  <service>SPARK2</service>
</requiredServices>
{code}

I also wouldn’t want to list only one or the other because this service supports both versions.

There should be some sort of mechanism to 



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