Raft implementation derived from the cornerstone project, which is a very lightweight C++ implementation with minimum dependencies, originally written by Andy Chen.

New features that are not described in the original paper, but required for the real-world use cases in eBay, have been added. We believe those features are useful for others outside eBay as well.

• Core Raft algorithm
  • Log replication & compaction
  • Leader election
  • Snapshot
  • Dynamic membership & configuration change
• Group commit & pipelined write
• User-defined log store & state machine support

• Pre-vote protocol
• Leadership expiration
• Priority-based semi-deterministic leader election
• Read-only member (learner)
• Object-based logical snapshot
• Custom/separate quorum size for commit & leader election
• Asynchronous replication
• SSL/TLS support

• Ubuntu

$ sudo apt-get install cmake openssl libssl-dev libz-dev

• OSX

$ brew install cmake
$ brew install openssl

• Windows
  • Download and install CMake.
  • Currently, we do not support SSL for Windows.

• Linux & OSX

$ ./prepare.sh

• Windows
  • Clone Asio asio-1-12-0 into the project directory.

C:\NuRaft> git clone https://github.com/chriskohlhoff/asio -b asio-1-12-0

• Linux & OSX

$ mkdir build
$ cd build
build$ cmake ../
build$ make

Run unit tests

build$ ./runtests.sh

• Windows:

C:\NuRaft> mkdir build
C:\NuRaft> cd build
C:\NuRaft\build> cmake -G "NMake Makefiles" ..\
C:\NuRaft\build> nmake

You may need to run vcvars script first in your build directory. For example (it depends on how you installed MSVC):

C:\NuRaft\build> c:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64.bat

Follow install instructions. LTS versions(4.2.2, 5.0.0) are verified compatible. Bazelisk is preferred as it helps manage Bazel versions.

bazel build -c opt //:nuraft

If debug version is desirable, run

bazel build -c dbg //:nuraft

bazel test -c dbg //tests/...

Please refer to this document.

Please refer to examples.

Please refer to tests/bench.

Quick Benchmark Results

• Ubuntu (tested on 14.04, 16.04, and 18.04)
• Centos (tested on 7)
• OSX (tested on 10.13 and 10.14)
• Windows (built using MSVC 2019, not thoroughly tested)

We welcome contributions. If you find any bugs, potential flaws and edge cases, improvements, new feature suggestions or discussions, please submit issues or pull requests.

• Jung-Sang Ahn [email protected]
• Gene Zhang [email protected]

Copyright 2017-2019 eBay Inc.

Author/Developer: Jung-Sang Ahn

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

1. URL: https://github.com/datatechnology/cornerstone
   License: https://github.com/datatechnology/cornerstone/blob/master/LICENSE
   Originally licensed under the Apache 2.0 license.

2. URL: https://github.com/stbrumme/crc32
   Original Copyright 2011-2016 Stephan Brumme
   See Original ZLib License: https://github.com/stbrumme/crc32/blob/master/LICENSE

3. URL: https://github.com/greensky00/simple_logger
   License: https://github.com/greensky00/simple_logger/blob/master/LICENSE
   Originally licensed under the MIT license.

4. URL: https://github.com/greensky00/testsuite
   License: https://github.com/greensky00/testsuite/blob/master/LICENSE
   Originally licensed under the MIT license.

5. URL: https://github.com/greensky00/latency-collector
   License: https://github.com/greensky00/latency-collector/blob/master/LICENSE
   Originally licensed under the MIT license.

6. URL: https://github.com/eriwen/lcov-to-cobertura-xml/blob/master/lcov_cobertura/lcov_cobertura.py
   License: https://github.com/eriwen/lcov-to-cobertura-xml/blob/master/LICENSE
   Copyright 2011-2012 Eric Wendelin
   Originally licensed under the Apache 2.0 license.

7. URL: https://github.com/bilke/cmake-modules
   License: https://github.com/bilke/cmake-modules/blob/master/LICENSE_1_0.txt
   Copyright 2012-2017 Lars Bilke
   Originally licensed under the BSD license.