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One service discovery backend to rule them all. The idea behind this was to seamlessly use tools and frameworks that heavily rely on zookeeper, for example, finagle, kafka, and keep/support/maintain just one key-value store. This could facilitate the migration to the nextgen service discovery/distributed configuration services like etcd or consul.

One of these two backends are available:

  • etcd
  • consul

Unsupported ZooKeeper features (ordered by priority):

  • [ ] Reliable zxid (X-Consul-Index & X-Etcd-Index)
  • [ ] Watches
  • [ ] Ephemeral Nodes
  • [ ] Sequence Nodes
  • [ ] ACLs
  • [ ] Auth
  • [ ] Process requests in batch (Multi)
  • [ ] Reliable Stats (?)

Listing of supported requests with some notes:

etcd consul
CREATE :white_check_mark: <sup>1</sup> :white_check_mark:
DELETE :white_check_mark: :white_check_mark:
EXISTS :white_check_mark: :white_check_mark:
GETDATA :white_check_mark: :white_check_mark:
SETDATA :white_check_mark: :white_check_mark:
GETACL :construction: :construction:
SETACL :construction: :construction:
GETCHILDREN :white_check_mark: :white_check_mark:
SYNC :white_check_mark: <sup23</sup> :white_check_mark: <sup>2</sup>
PING :white_check_mark: :white_check_mark:
GETCHILDREN2 :white_check_mark: :white_check_mark:
CHECK :white_check_mark: :white_check_mark:
MULTI :construction: :construction:
CREATE2 :white_check_mark:<sup>1</sup> :white_check_mark:
CLOSE :white_check_mark: :white_check_mark:
SETAUTH :construction: :construction:
SETWATCHES :construction: :construction:

<sup>1</sup> Unable to create a node with a key/path equal to an existing directory. (etcd will support this in v3 api: #1855)

<sup>2</sup> There is no similar etcd/consul request. For now, it does not proceed.

Using parkeeper is as easy as this:

docker run -p 2181:2181 -backend-url etcd://
docker run -p 2181:2181 -backend-url consul://

This project is in its early stages, use at your own risk. And of course, any feedback is appreciated as well as issues!

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