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Bug #13674

Updated by Tom Clegg about 4 years ago

Catch up with change to [[Cluster configuration]]. 

 A hash is more ops-friendly (notably it accommodates storing the whole config natively in consul's kv store using keys like "InstanceTypes/m1.large/price") and aligns with the existing Nodemanager config format. It also makes it more obvious that the instance type name has to be unique. 

 During a transition period programs that read the cluster config file should accommodate both array and hash forms, so ops can migrate their config files without stopping the world. 

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