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Comment: znode representation

...

  • All nodes join live_nodes, as is the case today
  • ZK structure for roles:
      • /node_roles
        • overseer
          • preferred 
            • nodes
              •  solr1_8983 (ephemeral node) 
              •  solr2_8983 (ephemeral node)
          • disallowed
            • nodes
              •  solr3_8983 (ephemeral node)
        • data
          • on 
            • nodes
              •  solr4_8983 (ephemeral node) 
              •  solr5_8983 (ephemeral node) 
          • off
            • nodes 
              •  solr6_8983 (ephemeral node) 
              •  solr7_8983 (ephemeral node) 
              ...
        • coordinator (example of a future role)
          • on
            • nodes
              • solrcoord1_8983 (ephemeral node)...

Roles During Application Lifecycle:

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