Billie Rinaldi created SLIDER-1100:
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             Summary: Support unique component names
                 Key: SLIDER-1100
                 URL: https://issues.apache.org/jira/browse/SLIDER-1100
             Project: Slider
          Issue Type: Sub-task
            Reporter: Billie Rinaldi
            Assignee: Billie Rinaldi
             Fix For: Slider 0.91


I'd like to be able to specify a set of uniquely named components in a group as 
follows:
{noformat}
    "ROLE": {
      "unique.names": "true",
      "yarn.role.priority": "1",
      "yarn.component.instances": 3,
      "yarn.memory": "512",
      "yarn.vcores": "2"
    }
{noformat}

This ROLE would be a component specified in the metainfo, resources, and 
appConfig.  When Slider sees the "unique.names" property set to true, it will 
create uniquely named components ROLE1, ROLE2, ROLE3, up to the number of 
instances specified.  Each component will have a unique priority as well, 
allowing them to be distinguished from each other and strictly placed if 
desired.

This would allow the user to issue a flex command such as "slider flex 
clusterName --component ROLE 1" to change the number of instances; in this 
case, Slider would set ROLE2 and ROLE3 to zero desired instances, and leave 
ROLE1 at one desired instance.  Uniquely named components would only have 0 or 
1 desired instances.  If the user flexed to a larger number of instances, 
Slider would create new component names as needed (e.g. ROLE4).



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