[jira] [Created] (AMBARI-13134) Stack advisor's recommendation should support both homogeneous and heterogenous nodes

["Vijay Srinivasaraghavan (JIRA)" <ji...@apache.org>]

Vijay Srinivasaraghavan created AMBARI-13134:
------------------------------------------------

             Summary: Stack advisor's recommendation should support both homogeneous and heterogenous nodes
                 Key: AMBARI-13134
                 URL: https://issues.apache.org/jira/browse/AMBARI-13134
             Project: Ambari
          Issue Type: Improvement
          Components: ambari-server, blueprints
    Affects Versions: trunk
            Reporter: Vijay Srinivasaraghavan
            Assignee: Srimanth Gunturi


Stack advisor provides service component placement recommendations for any given set oif hosts and services with the assumption that all the hosts are  homogeneous (same configuration - cpu/memory). This limits the possibility of assigning hosts that are capable of being master to associate master service components. 

By passing the host-group information with some hints specifying which distinction between master and slave nodes, the stack advisor component could place the appropriate master service components with the associated master hosts.

Stack advisor could parse the host group name ("masters" vs "slaves") and identifies if the hosts could be treated as master or slave. In the absence of the "hint", all the hosts will be assumed to be homogeneous (default/current implementation)   

"name":"masters-host-group1"
"name":"alsves-host-group1"
/api/v1/stacks/HDP/versions/2.3/recommendations
{
   "hosts":[
      "host1",
      "host2"
   ],
   "services":[
      "HDFS",
      "YARN",
      "MAPREDUCE2",
      "ZOOKEEPER"
   ],
   "recommendations":{
      "blueprint":{
         "host_groups":[
            {
               "name":"masters-host-group1",
               "components":[
               ]
            },
            {
               "name":"slave-host-group1",
               "components":[
               ]
            }
         ]
      },
      "blueprint_cluster_binding":{
         "host_groups":[
            {
               "name":"masters-host-group1",
               "hosts":[
                  {
                     "fqdn":"host1"
                  }
               ]
            },
            {
               "name":"slaves-host-group1",
               "hosts":[
                  {
                     "fqdn":"host2"
                  }
               ]
            }
         ]
      }
   },
   "recommend":"host_groups"
}



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