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This PR adds an extension for implementing the first version of task tiering as proposed in
https://groups.google.com/d/msg/druid-development/1I3CmxlOipM/e3-SpWqG170J
This is still a work in progress but I wanted to make sure it was available if people want to see where its going.
It depends on some changes to baseline druid, which I will try to keep track of here:
Move resource managemnt to be the responsibility of the TaskRunner #1953 - Moving resource control to the task runnerUse Worker instead of ZkWorker whenever possible #2249 - moving ZkWorker to a Worker wherever possible.Add hashCode and equals to DruidNode #2248 - DruidNode hashCode and equalsI'll flesh out the master comment some more as the PR gets closer to being ready to merge.