Introduction
A raft-based java library for building high-available, high-durable, strong-consistent commitlog, which could act as the persistent layer for distributed storage system, i.e. messaging, streaming, kv, db, etc.
Dledger has added many new features that are not described in the original paper. It has been proven to be a true production ready product.
Features
- Leader election
- Preferred leader election
- Pre-vote protocol
- High performance, high reliable storage support
- Parallel log replication between leader and followers
- Asynchronous replication
- State machine
- Multi-Raft
- High tolerance of symmetric network partition
- High tolerance of asymmetric network partition
- Jepsen verification with fault injection
New features waiting to be added
- Snapshot (working in progress)
- Dynamic membership & configuration change
- SSL/TLS support
Quick Start
Prerequisite
-
64bit JDK 1.8+
-
Maven 3.2.x
How to Build
mvn clean install -DskipTests
Run Command Line
- Get Command Usage
java -jar command/target/DLedger.jar
- Start DLedger Server
nohup java -jar command/target/DLedger.jar server &
- Append Data to DLedger
java -jar command/target/DLedger.jar append -d "Hello World"
- Get Data from DLedger
java -jar command/target/DLedger.jar get -i 0
Contributing
We always welcome new contributions, whether for trivial cleanups, big new features. We are always interested in adding new contributors. What we look for are series of contributions, good taste and ongoing interest in the project. If you are interested in becoming a committer, please let one of the existing committers know and they can help you walk through the process.
License
Apache License, Version 2.0 Copyright (C) Apache Software Foundation
