KIP-273 — Kafka to support using ETCD beside Zookeeper

Discussion Broker

Proposes making etcd an alternative metadata store to ZooKeeper by abstracting the ZooKeeper client calls behind a pluggable metadata store interface. In Kubernetes and other cloud-native environments, etcd is the native distributed coordination system; requiring ZooKeeper adds operational complexity for operators who want to avoid running a separate ZooKeeper ensemble.

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