https://github.com/apache/pulsar/issues/13717
----- ## Motivation Since all the pieces that composed the proposal in PIP-45 were finally merged and are currently ready for 2.10 release, it is now possible to add other metadata backends that can be used to support a BookKeeper + Pulsar cluster. One of the popular systems that is most commonly used as an alternative of ZooKeeper is Etcd, thus it makes sense to have this as the first non-zookeeper implementation. ## Goal Provide an Etcd implementation for the `MetadataStore` API. This will allow users to deploy Pulsar clusters using Etcd service for the metadata and it will not require the presence of ZooKeeper. ## Implementation * Use the existing JEtcd Java client library for Etcd * Extends the `AbstractBatchedMetadataStore` class, in order to reuse the transparent batching logic that will be shared with the ZooKeeper implementation. Work in progress: https://github.com/apache/pulsar/pull/13225 -- Matteo Merli <matteo.me...@gmail.com>
