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RedisRaft

⚠️ RedisRaft is still being developed and is not yet ready for any real production use. Please do not use it for any mission critical purpose at this time.

Strongly-Consistent Redis Deployments

RedisRaft is a Redis module that implements the Raft Consensus Algorithm, making it possible to create strongly-consistent clusters of Redis servers.

The Raft algorithm is provided by a standalone Raft library. This is a fork of the original library created by Willem-Hendrik Thiart, which is now actively maintained by Redis Ltd.

Main Features

  • Strong consistency (in the language of CAP, this system prioritizes consistency and partition-tolerance).
  • Support for most Redis data types and commands
  • Dynamic cluster configuration (adding / removing nodes)
  • Snapshots for log compaction
  • Configurable quorum or fast reads

Getting Started

Building

To compile the module, you will need:

  • Build essentials (a compiler, GNU make, etc.)
  • CMake
  • GNU autotools (autoconf, automake, libtool).

To build:

git clone https://github.com/RedisLabs/redisraft.git
cd redisraft
mkdir build && cd build
cmake ..
make

redisraft.so will be created under the project directory.

Creating a RedisRaft Cluster

RedisRaft requires Redis build from the 'unstable' branch. Build Redis first:

git clone https://github.com/redis/redis  
cd redis
make 
make install

To create a three-node cluster, start the first node:

redis-server \
    --port 5001 --dbfilename raft1.rdb \
    --loadmodule <path-to>/redisraft.so \
    --raft.log-filename raftlog1.db \
    --raft.addr localhost:5001

Then initialize the cluster:

redis-cli -p 5001 raft.cluster init

Now start the second node, and run the RAFT.CLUSTER JOIN command to join it to the existing cluster:

redis-server \
    --port 5002 --dbfilename raft2.rdb \
    --loadmodule <path-to>/redisraft.so \
    --raft.log-filename raftlog2.db \
    --raft.addr localhost:5002

redis-cli -p 5002 RAFT.CLUSTER JOIN localhost:5001

Now add the third node in the same way:

redis-server \
    --port 5003 --dbfilename raft3.rdb \
    --loadmodule <path-to>/redisraft.so \
    --raft.log-filename raftlog3.db 
    --raft.addr localhost:5003

redis-cli -p 5003 RAFT.CLUSTER JOIN localhost:5001

To query the cluster state, run the INFO raft command:

redis-cli -p 5001 INFO raft

Now you can start using this RedisRaft cluster. All supported Redis commands will be executed in a strongly-consistent manner using the Raft protocol.

Documentation

Please consult the documentation for more information.

License

RedisRaft is licensed under the Redis Source Available License 2.0 (RSALv2) or the Server Side Public License v1 (SSPLv1).