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changes.mady.by.user Ishan Chattopadhyaya

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changes.mady.by.user Ishan Chattopadhyaya

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  • All nodes join live_nodes, as is the case today
  • ZK structure for roles:
    • /roles
        - overseer
             - solr1:8983 (ephemeral nodes)
             - solr2:8983 ( .. )
        - <rolename>
             - <nodename>solr1_8983
               {"roles": "data", "overseer"]
       - solr2_8983
             

Other notes

  • Every time a node starts up with specified roles, the node assumes it is the correct role for that node and publishes those roles in ZK after successful startup.
  • If a node is started with a -Dsolr.node.roles parameter that doesn't have a data role, but it already has data hosting replicas on it, the startup fails with an error (and a hint indicating how to move replicas away from this replica).
  • If a coordinator node is started with "data" role also, it fails to startup with a message indicating a node cannot both be coordinator and data node.

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