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Release It!, 2nd Edition by Michael T. Nygard

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Configuration Services

Configuration services like ZooKeeper and etcd are distributed databases that applications can use to coordinate their configuration.[42][43] Configuration in this sense is more than just the static parameters that an instance would keep in .properties files. It does include simple settings such as hostnames, resource pool sizes, and timeouts. But “configuration” also includes the arrangement of instances among themselves. These configuration databases can be used for orchestration, leader election (in the case of a cluster with a master node), or quorum-based consensus.

However, these are built with code and not magic. They are still bound by the constraints of the CAP theorem and sub-light-speed communications. The ...

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