Bolt is a C++ acceleration library providing composable, extensible and performant data processing toolkit. It is designed to provide generic and unified interfaces which can be pluggable into “any framework” running on “any hardware” to consume “any data source”.

Initially derived from Velox project, Bolt is created by ByteDance to embrace and unify the contributions from the community. It has been validated on Spark/Flink/Presto/ElasticSearch framework running on x64&ARM CPU/DPU/GPU accessing Parquet/ORC/Text/CSV/Lance file format managed under Hive/Paimon table to provide enterprise-grade cost optimization, results consistency and feature parity

Why Bolt?

“Open Source-First” Philosophy

“Contributions may come in many forms, and all of them are valuable”. The governance model of Bolt community will be in line with the Apache Way and “Community over Code” spirit. While we are working out the detailed governance model on a tree-tier structure of Contributor / Maintainers / Project Management Committee(PMC), we are committed to treating the open source repository as the source of truth, including but not limited to

• Public CI pipelines
• Clear dependency management as code
• Equal code review opportunity for manintainers
• Transparent design discussion

This will ensure the smooth & credible experience for code contribution

Embrace the Analytical Ecosystem

Bolt focuses on the physical execution layer of DBMS while providing first-class and high performance support for popular frameworks and storage formats.

Frameworks:

• Apache Gluten for Spark
• RFC for PrestoDB
• OpenSearch for ElasticSearch
• Flink (Coming Soon)
• …

Storage Formats:

• Parquet
• ORC
• TXT
• CSV
• Paimon
• Lance (Coming Soon)
• …

Enterprise-Grade Performance, Result Consistency & Feature parity

Bolt is designed as a seamless acceleration layer that requires minimum code changes to the existing user jobs. Results/Performance comparison against original frameworks is performed on regular basis to capture regression & corner cases. Key features including

• Adaptive Task Parallelism
• Native Memory Management & Dynamic offheap threshold
• Operator Fusion
• JIT for hotspot expression
• Native Shuffle Support
• …

Getting Started

Get the Bolt Source

git clone https://github.com/bytedance/bolt.git
cd bolt

Setup Develop Env

We provide scripts to help developers configure the environment and install dependencies.

scripts/setup-dev-env.sh

Bolt uses Conan as its dependency management tool, which is an open source and multi-platform package manager.

This script exports conan recipes to local cache. For the first time, dependencies will be built from source and installed into local cache. You can setup your own conan server to accelerate building.

Building Bolt

Building Bolt for Presto

Run make in the root directory to compile the sources. For development, use make debug to build a non-optimized debug version, or make release to build an optimized version. Use make unittest to build and run tests.

make release

# In main branch, by default, BUILD_VERSION is main.
make release BUILD_VERSION=main

Building Bolt for Gluten

Before you begin, please ensure that the following software is present in your environment: JDK (currently only JDK 11 and JDK 17 are supported), Maven, and curl.

First, you need to compile Bolt, and then export Bolt as a library.

cd bolt
make release_spark
make export_release

Then you can compile Gluten that supports Bolt.

git clone -b add_bolt_backend https://github.com/WangGuangxin/gluten.git
cd gluten
make arrow
make release
make jar

Building Bolt for other system

You can use the make release && make export_release command to compile and export Bolt, and then use conan to reference Bolt. Below is a conanfile example that references Bolt as a third-party dependency.

# Take gluten for example:
class GluenConan(ConanFile):
  def requirements(self):
    bolt_version="main"
    self.requires(f"bolt/{bolt_version}", transitive_headers=True, transitive_libs=True)

Contributing

Check our contributing guide to learn about how to contribute to the project.

Community

• Please join our Slack channel and ask in #dev.

License

Bolt is licensed under the Apache 2.0 License. A copy of the license can be found here.