apache/ratis

Health v2 · maintenance only

Flags: no_releases

Adoption not part of the score

1474 stars · 453 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Apache Ratis is a highly customizable Java library implementing the Raft consensus protocol for managing replicated logs and state. It offers pluggable transport (gRPC, Netty, Hadoop RPC), state machine, Raft log, and metrics layers, plus a LogService recipe for distributed log management.

Use cases

• replicate application state across multiple Java instances
• build a highly available replicated log for my system
• implement a custom state machine with consensus
• add fault-tolerant data replication to a Java service
• build a distributed log service
• understand and experiment with the Raft consensus algorithm
• replace ZooKeeper-style coordination with an embeddable library

When to choose

• you need Raft consensus embedded in a Java/JVM application
• you want pluggable transport, log, state machine, and metrics layers
• you need high-throughput data replication rather than a standalone coordination server
• you want an Apache-licensed, actively maintained consensus library

When to avoid

• you need a standalone, out-of-the-box coordination server like ZooKeeper or Consul
• your stack is not on the JVM
• you only need simple leader election without a replicated log
• you need a consensus protocol other than Raft

Facets

library · maturity stable

rpc serialization monitoring concurrency microservices developer-tools databases jvm cross-platform raft consensus replicated-log state-machine-replication grpc apache

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