dgraph-io/badger

BadgerDB

BadgerDB is an embeddable, persistent and fast key-value (KV) database written in pure Go. It is the underlying database for Dgraph, a fast, distributed graph database. It's meant to be a performant alternative to non-Go-based key-value stores like RocksDB.

Project Status

Badger is stable and is being used to serve data sets worth hundreds of terabytes. Badger supports concurrent ACID transactions with serializable snapshot isolation (SSI) guarantees. A Jepsen-style bank test runs nightly for 8h, with --race flag and ensures the maintenance of transactional guarantees. Badger has also been tested to work with filesystem level anomalies, to ensure persistence and consistency. Badger is being used by a number of projects which includes Dgraph, Jaeger Tracing, UsenetExpress, and many more.

The list of projects using Badger can be found here.

Please consult the Changelog for more detailed information on releases.

Note: Badger is built with go 1.23 and we refrain from bumping this version to minimize downstream effects of those using Badger in applications built with older versions of Go.

Table of Contents

• BadgerDB
  • Project Status
  • Table of Contents
  • Getting Started
    • Installing
      • Installing Badger Command Line Tool
      • Choosing a version
  • Badger Documentation
  • Resources
    • Blog Posts
  • Design
    • Comparisons
    • Benchmarks
  • Projects Using Badger
  • Contributing
  • Contact

Getting Started

Installing

To start using Badger, install Go 1.23 or above. Badger v3 and above needs go modules. From your project, run the following command

go get github.com/dgraph-io/badger/v4

This will retrieve the library.

Installing Badger Command Line Tool

Badger provides a CLI tool which can perform certain operations like offline backup/restore. To install the Badger CLI, retrieve the repository and checkout the desired version. Then run

cd badger
go install .

This will install the badger command line utility into your $GOBIN path.

Badger Documentation

Badger Documentation is available at https://badger.dgraph.io

Resources

Blog Posts

1. Introducing Badger: A fast key-value store written natively in Go
2. Make Badger crash resilient with ALICE
3. Badger vs LMDB vs BoltDB: Benchmarking key-value databases in Go
4. Concurrent ACID Transactions in Badger

Design

Badger was written with these design goals in mind:

• Write a key-value database in pure Go.
• Use latest research to build the fastest KV database for data sets spanning terabytes.
• Optimize for SSDs.

Badger’s design is based on a paper titled WiscKey: Separating Keys from Values in SSD-conscious Storage.

Comparisons

¹ The WISCKEY paper (on which Badger is based) saw big wins with separating values from keys, significantly reducing the write amplification compared to a typical LSM tree.

² RocksDB is an SSD optimized version of LevelDB, which was designed specifically for rotating disks. As such RocksDB's design isn't aimed at SSDs.

³ SSI: Serializable Snapshot Isolation. For more details, see the blog post Concurrent ACID Transactions in Badger

⁴ Badger provides direct access to value versions via its Iterator API. Users can also specify how many versions to keep per key via Options.

Benchmarks

We have run comprehensive benchmarks against RocksDB, Bolt and LMDB. The benchmarking code, and the detailed logs for the benchmarks can be found in the badger-bench repo. More explanation, including graphs can be found the blog posts (linked above).

Projects Using Badger

Below is a list of known projects that use Badger:

• Dgraph - Distributed graph database.
• Jaeger - Distributed tracing platform.
• go-ipfs - Go client for the InterPlanetary File System (IPFS), a new hypermedia distribution protocol.
• Riot - An open-source, distributed search engine.
• emitter - Scalable, low latency, distributed pub/sub broker with message storage, uses MQTT, gossip and badger.
• OctoSQL - Query tool that allows you to join, analyse and transform data from multiple databases using SQL.
• Dkron - Distributed, fault tolerant job scheduling system.
• smallstep/certificates - Step-ca is an online certificate authority for secure, automated certificate management.
• Sandglass - distributed, horizontally scalable, persistent, time sorted message queue.
• TalariaDB - Grab's Distributed, low latency time-series database.
• Sloop - Salesforce's Kubernetes History Visualization Project.
• Usenet Express - Serving over 300TB of data with Badger.
• gorush - A push notification server written in Go.
• 0-stor - Single device object store.
• Dispatch Protocol - Blockchain protocol for distributed application data analytics.
• GarageMQ - AMQP server written in Go.
• RedixDB - A real-time persistent key-value store with the same redis protocol.
• BBVA - Raft backend implementation using BadgerDB for Hashicorp raft.
• Fantom - aBFT Consensus platform for distributed applications.
• decred - An open, progressive, and self-funding cryptocurrency with a system of community-based governance integrated into its blockchain.
• OpenNetSys - Create useful dApps in any software language.
• HoneyTrap - An extensible and opensource system for running, monitoring and managing honeypots.
• Insolar - Enterprise-ready blockchain platform.
• IoTeX - The next generation of the decentralized network for IoT powered by scalability- and privacy-centric blockchains.
• go-sessions - The sessions manager for Go net/http and fasthttp.
• Babble - BFT Consensus platform for distributed applications.
• Tormenta - Embedded object-persistence layer / simple JSON database for Go projects.
• BadgerHold - An embeddable NoSQL store for querying Go types built on Badger
• Goblero - Pure Go embedded persistent job queue backed by BadgerDB
• Surfline - Serving global wave and weather forecast data with Badger.
• Cete - Simple and highly available distributed key-value store built on Badger. Makes it easy bringing up a cluster of Badger with Raft consensus algorithm by hashicorp/raft.
• Volument - A new take on website analytics backed by Badger.
• KVdb - Hosted key-value store and serverless platform built on top of Badger.
• Terminotes - Self hosted notes storage and search server - storage powered by BadgerDB
• Pyroscope - Open source continuous profiling platform built with BadgerDB
• Veri - A distributed feature store optimized for Search and Recommendation tasks.
• bIter - A library and Iterator interface for working with the badger.Iterator, simplifying from-to, and prefix mechanics.
• ld - (Lean Database) A very simple gRPC-only key-value database, exposing BadgerDB with key-range scanning semantics.
• Souin - A RFC compliant HTTP cache with lot of other features based on Badger for the storage. Compatible with all existing reverse-proxies.
• Xuperchain - A highly flexible blockchain architecture with great transaction performance.
• m2 - A simple http key/value store based on the raft protocol.
• chaindb - A blockchain storage layer used by Gossamer, a Go client for the Polkadot Network.
• vxdb - Simple schema-less Key-Value NoSQL database with simplest API interface.
• Opacity - Backend implementation for the Opacity storage project
• Vephar - A minimal key/value store using hashicorp-raft for cluster coordination and Badger for data storage.
• gowarcserver - Open-source server for warc files. Can be used in conjunction with pywb
• flow-go - A fast, secure, and developer-friendly blockchain built to support the next generation of games, apps and the digital assets that power them.
• Wrgl - A data version control system that works like Git but specialized to store and diff CSV.
• Loggie - A lightweight, cloud-native data transfer agent and aggregator.
• raft-badger - raft-badger implements LogStore and StableStore Interface of hashcorp/raft. it is used to store raft log and metadata of hashcorp/raft.
• DVID - A dataservice for branched versioning of a variety of data types. Originally created for large-scale brain reconstructions in Connectomics.
• KVS - A library for making it easy to persist, load and query full structs into BadgerDB, using an ownership hierarchy model.
• LLS - LLS is an efficient URL Shortener that can be used to shorten links and track link usage. Support for BadgerDB and MongoDB. Improved performance by more than 30% when using BadgerDB
• lakeFS - lakeFS is an open-source data version control that transforms your object storage to Git-like repositories. lakeFS uses BadgerDB for its underlying local metadata KV store implementation
• Goptivum - Goptivum is a better frontend and API for the Vulcan Optivum schedule program
• ActionManager - A dynamic entity manager based on rjsf schema and badger db
• MightyMap - Mightymap: Conveys both robustness and high capability, fitting for a powerful concurrent map.
• FlowG - A low-code log processing facility
• Bluefin - Bluefin is a TUNA Proof of Work miner for the Fortuna smart contract on the Cardano blockchain
• cDNSd - A Cardano blockchain backed DNS server daemon
• Dingo - A Cardano blockchain data node

If you are using Badger in a project please send a pull request to add it to the list.

Platform Compatibility

Badger uses OS-specific implementations for directory locking and fsync operations. On POSIX-compliant systems (Linux, macOS, BSD), these work as expected.

For non-POSIX platforms, be aware of potential limitations:

If you encounter issues on these platforms, review the corresponding dir_*.go source file for implementation details.

Contributing

If you're interested in contributing to Badger see CONTRIBUTING.

Contact

• Please use Github issues for filing bugs.
• Please use Discussions for questions, discussions, and feature requests.