Open source Java implementation for Raft consensus protocol.

Clone this repo:
  1. e9755a6 RATIS-2204. Avoid downloads from repository.apache.org (#1187) by Doroszlai, Attila · 8 hours ago master
  2. a4826e2 RATIS-2185. Improve gRPC log messages debugability. (#1186) by Tsz-Wo Nicholas Sze · 10 days ago
  3. 3efec8d RATIS-2201. Bump ratis-thirdparty from 1.0.6 to 1.0.7 (#1185) by Potato · 14 days ago
  4. ccbe9a6 RATIS-2194. FileLock didn't unlock properly (#1183) by Chung En Lee · 2 weeks ago
  5. 04396ca RATIS-2191. Add ResourceLeakDetector to Netty tests (#1180) by Ivan Andika · 3 weeks ago

Apache Ratis

Apache Ratis is a Java library that implements the Raft protocol [1], where an extended version of the Raft paper is available at https://raft.github.io/raft.pdf. The paper introduces Raft and states its motivations in following words:

Raft is a consensus algorithm for managing a replicated log. It produces a result equivalent to (multi-)Paxos, and it is as efficient as Paxos, but its structure is different from Paxos; this makes Raft more understandable than Paxos and also provides a better foundation for building practical systems.

Ratis aims to make Raft available as a java library that can be used by any system that needs to use a replicated log. It provides pluggability for state machine implementations to manage replicated states. It also provides pluggability for Raft log, rpc implementations and metric implementations to make it easy for integration with other projects. Another important goal is to support high throughput data ingest so that it can be used for more general data replication use cases.

Reference

  1. Diego Ongaro and John Ousterhout, In Search of an Understandable Consensus Algorithm, 2014 USENIX Annual Technical Conference (USENIX ATC 14) (Philadelphia, PA), USENIX Association, 2014, pp. 305-319.