ZooKeeper alternatives? (cluster coordination service) [closed]

Answer 1

Just discovered Accord (C) and OpenReplica/ConCoord (Python) which may be interesting solutions

[EDIT] The Hashicorp crew, of Vagrant and Packer fame, are cooking "a decentralized solution for service discovery and orchestration" called Serf.

[EDIT2] Hashicorp strikes again ! They just released Consul, built on top of Serf. The pitch: "a solution for service discovery and configuration, completely distributed, highly available, scalable to thousands of nodes and services across multiple datacenters".

Answer 2

OpenReplica from my research group is a highly available FOSS coordination service for data centers. It can be used for implementing locking, fail over, leader election, group membership and other coordination services. It differs from ZooKeeper in two critical ways:

• It uses an object-oriented API. This makes it much easier to write coordination services. Synchronization code for OpenReplica looks exactly like its textbook counterpart; there is no need to master a file and upcall-based API like in ZooKeeper and Chubby.

• It enables dynamic membership updates to the replica set. There is no need for static configuration files. The system is integrated into DNS (authoritative, slave for OpenReplica, or Amazon Route 53).

We actively support the system, do not hesitate to let us know if you have further questions.

Answer 3

It seems Corosync is also like ZooKeeper.

Answer 4

There's a very promising alternative to ZooKeeper called etcd (github.com/coreos/etcd), written by CoreOS team. Unlike Doozerd, etcd is being actively developed.

Answer 5

There are different tools that optimize for different engineering trade-offs.

• ZooKeeper Scales marginally for reads; writes with many observers can be slow. It is proven and has a sizable community.
• Accord Seems interesting for write-intensive uses, however typical use-cases already have domain-specific solutions (i.e., logging, telemetry).

The others are somewhat interesting but generally unproven. Don't get this wrong if intended for production usage.

Answer 6

I'd found this comparison of Zookeeper, etcd and Doozer: http://devo.ps/blog/zookeeper-vs-doozer-vs-etcd/

Serf (serfdom.io) is also a nice solution as it is simple! But you must consider, SERF is just a cluster-manager which enables you to send custom events to all cluster nodes. Thats nice, but you have to write your own shell scripts (aka events). See this example: "https://www.digitalocean.com/community/articles/how-to-set-up-a-serf-cluster-on-several-ubuntu-vps"

The advantage is, you're getting a very simple cluster-manager and you're able to combine this with your favorite configuration, deployment or continuous integration tool.