clintropolis commented on issue #7201: Coordinator documentation is stale
URL: 
https://github.com/apache/incubator-druid/issues/7201#issuecomment-470287410
 
 
   Yes, you are right, loading and dropping decisions are done with the 
`BalancerStrategy` so that the load rules and the balancer do not make 
contradictory decisions. I believe `DiskNormalizedCostBalancerStrategy` would 
achieve what the current document is describing, but I think 
`CostBalancerStrategy` or `CachingCostBalancerStrategy` don't care so much 
about disk i think and just prefer to spread out the timeline for maximum 
fanout.
   
   You are also correct about http segment loading, where the coordinator 
maintains a list of segments to load and drop (`HttpLoadQueuePeon`), and talks 
to the historical directly over http (`SegmentListerResource` on historical 
side) to give it a batch of load or drop operations to do.

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