RaftKeeper is a high-performance distributed consensus service.

It is fully compatible with Zookeeper and can be accessed through the Zookeeper client. It implements most of the functions of Zookeeper (except: Container node, TTL node, quota etc.) and provides some additional functions, such as more monitoring indicators, manual Leader switching and so on.

RaftKeeper provides same consistency guarantee:

1. Responses must be returned in order in one session.
2. All committed write requests must be handled in order, across all sessions.

RaftKeeper stores its data in memory, while also offering robust data persistence through a combination of snapshots and operation logs. To enhance system efficiency, the execution framework leverages a pipelined and batch processing approach, significantly boosting overall throughput. Crafted in C++, the system has undergone extensive low-level optimization to deliver superior performance, ensuring that it operates at peak efficiency.

The main features of RaftKeeper are its performance and query stability.

1. The TPS is more than 2x higher than Zookeeper
2. TP99 is smoother than Zookeeper

See benchmark for details.

RaftKeeper is derived from ClickHouse and take NuRaft as Raft implementation. We really appreciate the excellent work of the ClickHouse and NuRaft teams.

How to start?

1. Build RaftKeeper

Build on Ubuntu

Requirement: Ubuntu 20.04+, Clang 17+, Cmake 3.20+

# install tools
sudo apt-get install cmake llvm-17
 
# clone project
git clone https://github.com/JDRaftKeeper/RaftKeeper.git
git submodule sync && git submodule update --init --recursive
 
# build project
export CC=`which clang-17` CXX=`which clang++-17`
cd RaftKeeper && /bin/bash build.sh

# build for ClickHouse usage (for ClickHouse client is slightly incompatible with zookeeper)
cd RaftKeeper && /bin/bash build.sh 'clickhouse'

# now you can find built files in director 'build/'

Now RaftKeeper support build on Linux and Mac OX both x86 and arm64, details see how-to-build

2. Deploy RaftKeeper

To deploy a RaftKeeper cluster you can see how-to-deploy.

3. Access RaftKeeper

You can use ZooKeeper's shell client zkCli.sh to access to RaftKeeper, or you can use Java, python or C ZooKeeper clients to access it. The following is a zkCli.sh demo

./zkCli.sh -server localhost:8101

Also, RaftKeeper supports Zookeeper's 4lw command. 4lw command provide the ability to monitor and manage RaftKeeper, details see how-to-monitor-and-manage

How to migrate from Zookeeper?

RaftKeeper provides a tool to translate Zookeeper data to RaftKeeper format. So you can simply move the translated data into RaftKeeper, detail is in how-to-migrate-from-zookeeper.