himanshug commented on issue #6698: do not watch unwanted tier's data node in 
HttpServerInventoryView
URL: https://github.com/apache/incubator-druid/pull/6698#issuecomment-486843576
 
 
   @jihoonson historicals don't announce to either coordinator/broker. 
coordinator/broker watch that information. so broker needs to stop getting(or 
discarding) the stuff it doesn't need. 
   
   a bit more detail....
   in case of "zookeeper":  historicals publish information about segments 
served in specific zookeeper nodes. coordinator/broker watch those paths.
   
   in case of "http" , coordinator/broker send http request to get what 
segments are served by historical. historical does not need to announce 
segments anywhere in this case.
   By default historicals are always announcing in zookeeper so that users can 
seamlessly change between zookeeper or http at broker/coordinator . If someone 
is using http at all coordinators/brokers, they can change historical config ( 
druid.announcer.skipSegmentAnnouncementOnZk=false) so that it doesn't announce 
segments in zookeeper anymore. That property is undocumented currently because 
of the non-production-ready official status of http stuff.

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