Apache Ratis (Incubating)

Clone this repo:
  1. 284db7f RATIS-767. DirectByteBuffers leaked by BufferedWriteChannel in SegmentRaftLog. Contributed by Mukul Kumar Singh. by Mukul Kumar Singh · 5 days ago master
  2. 79d6004 RATIS-765. ClientProtoUtils#toRaftClientReplyProto should handle AlreadyClosedException. Contributed by Hanisha Koneru by Tsz Wo Nicholas Sze · 6 days ago
  3. 1402eb8 RATIS-768. LogUtils#infoOrTrace prints exception trace at both levels. Contributed by Attila Doroszlai by Tsz Wo Nicholas Sze · 6 days ago
  4. 3f7d416 RATIS-771. Rat check failure due to a unwanted tmp file. Contributed by Attila Doroszlai by Tsz Wo Nicholas Sze · 6 days ago
  5. 22ceab2 RATIS-729. Add an assertion in ClientProtoUtils#toRaftClientReplyProto. Contributed by Hanisha Koneru by Tsz Wo Nicholas Sze · 13 days 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, and rpc 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.