JuiceFS 是一个完全插件式的分布式文件系统。

Davies Liu 3e49ab6af5 sync: fix parallel list with dir (#3738) 18 hours ago
.github a82833aee4 CI: fix misc test. (#3730) 1 day ago
cmd 3e49ab6af5 sync: fix parallel list with dir (#3738) 18 hours ago
deploy 4ddef108e4 Gateway: update image tag of CSI Driver to v0.15.1 (#2355) 10 months ago
docs 49b9a3a1b4 docs: add guide for dir stats (#3721) 2 days ago
fstests 3247c6b889 support redis cluster (#1696) 1 year ago
hack 4e5ede5660 deps: upgrade docker cross build image's golang version to 1.18 (#2468) 9 months ago
integration e6065a41ba imporve gateway test (#3187) 4 months ago
pkg 3e49ab6af5 sync: fix parallel list with dir (#3738) 18 hours ago
rfcs ebeada96c6 count space and inodes usage for each directory (#3257) 3 months ago
sdk cbeafb7bc8 sdk/java: limit generated uid/gid to int32 for sql engines (#3680) 1 week ago
.autocorrectrc 5f329b1194 Docs: lint and check broken link (#3139) 5 months ago
.gitignore 5f329b1194 Docs: lint and check broken link (#3139) 5 months ago
.golangci.yml 873d8f27df golangci-lint skip test file (#1267) 1 year ago
.goreleaser.yml 9661d43f59 skip auto update brew tap in goreleaser (#2286) 11 months ago
.markdownlint-cli2.jsonc 8a19f5254b hadoop: support put node list file in JuiceFS for Blocklocation usage (#3425) 1 month ago
.pre-commit-config.yaml e2fabcc1c6 consolidate content regarding profile & stats (#3392) 2 months ago
ADOPTERS.md 7a70662c87 Docs: add "Integrations" doc and update "Adopters" doc (#2426) 10 months ago
ADOPTERS_CN.md 7a70662c87 Docs: add "Integrations" doc and update "Adopters" doc (#2426) 10 months ago
CODE_OF_CONDUCT.md 3e6f2b567c update (#1561) 1 year ago
CONTRIBUTING.md 223b2e1f09 doc: improve contributing guide doc (#2406) 10 months ago
LICENSE 9c7f58b298 Change License to Apache 2.0 (#1282) 1 year ago
Makefile 5efca5f730 CI: split unit test (#3512) 1 month ago
README.md f1f0148165 docs: further explain chunk / slice relationship (#3649) 1 week ago
README_CN.md f1f0148165 docs: further explain chunk / slice relationship (#3649) 1 week ago
check-changed.sh 90e98ff48d skip travis ci on .github directory change (#1924) 1 year ago
go.mod 5dfa60a0c5 cmds: add category for flags of format/config/sync (#3697) 4 days ago
go.sum 5dfa60a0c5 cmds: add category for flags of format/config/sync (#3697) 4 days ago
main.go 8df1d8f9be use ./cmd as a package (#1994) 1 year ago
package-lock.json 0e2fef86e2 build(deps): bump webpack from 5.75.0 to 5.76.2 (#3346) 2 months ago
package.json 5f329b1194 Docs: lint and check broken link (#3139) 5 months ago

README.md

JuiceFS Logo

GitHub Workflow Status GitHub Workflow Status Go Report English doc Join Slack

JuiceFS is a high-performance POSIX file system released under Apache License 2.0, particularly designed for the cloud-native environment. The data, stored via JuiceFS, will be persisted in object storage (e.g. Amazon S3), and the corresponding metadata can be persisted in various database engines such as Redis, MySQL, and TiKV based on the scenarios and requirements.

With JuiceFS, massive cloud storage can be directly connected to big data, machine learning, artificial intelligence, and various application platforms in production environments. Without modifying code, the massive cloud storage can be used as efficiently as local storage.

📖 Document: Quick Start Guide

Highlighted Features

  1. Fully POSIX-compatible: Use as a local file system, seamlessly docking with existing applications without breaking business workflow.
  2. Fully Hadoop-compatible: JuiceFS' Hadoop Java SDK is compatible with Hadoop 2.x and Hadoop 3.x as well as a variety of components in the Hadoop ecosystems.
  3. S3-compatible: JuiceFS' S3 Gateway provides an S3-compatible interface.
  4. Cloud Native: A Kubernetes CSI Driver is provided for easily using JuiceFS in Kubernetes.
  5. Shareable: JuiceFS is a shared file storage that can be read and written by thousands of clients.
  6. Strong Consistency: The confirmed modification will be immediately visible on all the servers mounted with the same file system.
  7. Outstanding Performance: The latency can be as low as a few milliseconds, and the throughput can be expanded nearly unlimitedly (depending on the size of the object storage). Test results
  8. Data Encryption: Supports data encryption in transit and at rest (please refer to the guide for more information).
  9. Global File Locks: JuiceFS supports both BSD locks (flock) and POSIX record locks (fcntl).
  10. Data Compression: JuiceFS supports LZ4 or Zstandard to compress all your data.

Architecture | Getting Started | Advanced Topics | POSIX Compatibility | Performance Benchmark | Supported Object Storage | Who is using | Roadmap | Reporting Issues | Contributing | Community | Usage Tracking | License | Credits | FAQ


Architecture

JuiceFS consists of three parts:

  1. JuiceFS Client: Coordinates object storage and metadata storage engine as well as implementation of file system interfaces such as POSIX, Hadoop, Kubernetes, and S3 gateway.
  2. Data Storage: Stores data, with supports of a variety of data storage media, e.g., local disk, public or private cloud object storage, and HDFS.
  3. Metadata Engine: Stores the corresponding metadata that contains information of file name, file size, permission group, creation and modification time and directory structure, etc., with supports of different metadata engines, e.g., Redis, MySQL, SQLite and TiKV.

JuiceFS Architecture

JuiceFS can store the metadata of file system on Redis, which is a fast, open-source, in-memory key-value data storage, particularly suitable for storing metadata; meanwhile, all the data will be stored in object storage through JuiceFS client. Learn more

Each file stored in JuiceFS is split into "Chunk" s at a fixed size with the default upper limit of 64 MiB. Each Chunk is composed of one or more "Slice"(s), and the length of the slice varies depending on how the file is written. Each slice is composed of size-fixed "Block" s, which are 4 MiB by default. These blocks will be stored in object storage in the end; at the same time, the metadata information of the file and its Chunks, Slices, and Blocks will be stored in metadata engines via JuiceFS. Learn more

How JuiceFS stores your files

When using JuiceFS, files will eventually be split into Chunks, Slices and Blocks and stored in object storage. Therefore, the source files stored in JuiceFS cannot be found in the file browser of the object storage platform; instead, there are only a chunks directory and a bunch of digitally numbered directories and files in the bucket. Don't panic! This is just the secret of the high-performance operation of JuiceFS!

Getting Started

Before you begin, make sure you have:

  1. Redis database for metadata storage
  2. Object storage for storing data blocks
  3. JuiceFS Client downloaded and installed

Please refer to Quick Start Guide to start using JuiceFS right away!

Command Reference

Check out all the command line options in command reference.

Containers

JuiceFS can be used as a persistent volume for Docker and Podman, please check here for details.

Kubernetes

It is also very easy to use JuiceFS on Kubernetes. Please find more information here.

Hadoop Java SDK

If you wanna use JuiceFS in Hadoop, check Hadoop Java SDK.

Advanced Topics

Please refer to JuiceFS Document Center for more information.

POSIX Compatibility

JuiceFS has passed all of the compatibility tests (8813 in total) in the latest pjdfstest .

All tests successful.

Test Summary Report
-------------------
/root/soft/pjdfstest/tests/chown/00.t          (Wstat: 0 Tests: 1323 Failed: 0)
  TODO passed:   693, 697, 708-709, 714-715, 729, 733
Files=235, Tests=8813, 233 wallclock secs ( 2.77 usr  0.38 sys +  2.57 cusr  3.93 csys =  9.65 CPU)
Result: PASS

Aside from the POSIX features covered by pjdfstest, JuiceFS also provides:

  • Close-to-open consistency. Once a file is written and closed, it is guaranteed to view the written data in the following open and read. Within the same mount point, all the written data can be read immediately.
  • Rename and all other metadata operations are atomic, which are guaranteed by Redis transaction.
  • Opened files remain accessible after unlink from same mount point.
  • Mmap (tested with FSx).
  • Fallocate with punch hole support.
  • Extended attributes (xattr).
  • BSD locks (flock).
  • POSIX record locks (fcntl).

Performance Benchmark

Basic benchmark

JuiceFS provides a subcommand that can run a few basic benchmarks to help you understand how it works in your environment:

JuiceFS Bench

Throughput

A sequential read/write benchmark has also been performed on JuiceFS, EFS and S3FS by fio.

Sequential Read Write Benchmark

Above result figure shows that JuiceFS can provide 10X more throughput than the other two (see more details).

Metadata IOPS

A simple mdtest benchmark has been performed on JuiceFS, EFS and S3FS by mdtest.

Metadata Benchmark

The result shows that JuiceFS can provide significantly more metadata IOPS than the other two (see more details).

Analyze performance

See Real-Time Performance Monitoring if you encountered performance issues.

Supported Object Storage

  • Amazon S3
  • Google Cloud Storage
  • Azure Blob Storage
  • Alibaba Cloud Object Storage Service (OSS)
  • Tencent Cloud Object Storage (COS)
  • Qiniu Cloud Object Storage (Kodo)
  • QingStor Object Storage
  • Ceph RGW
  • MinIO
  • Local disk
  • Redis
  • ...

JuiceFS supports almost all object storage services. Learn more.

Who is using

JuiceFS is production ready and used by thousands of machines in production. A list of users has been assembled and documented here. In addition JuiceFS has several collaborative projects that integrate with other open source projects, which we have documented here. If you are also using JuiceFS, please feel free to let us know, and you are welcome to share your specific experience with everyone.

The storage format is stable, will be supported by all future releases.

Roadmap

  • Support FoundationDB as metadata engine
  • Directory quotas
  • User and group quotas
  • Snapshot
  • Write once read many (WORM)

Reporting Issues

We use GitHub Issues to track community reported issues. You can also contact the community for any questions.

Contributing

Thank you for your contribution! Please refer to the JuiceFS Contributing Guide for more information.

Community

Welcome to join the Discussions and the Slack channel to connect with JuiceFS team members and other users.

Usage Tracking

JuiceFS collects anonymous usage data by default to help us better understand how the community is using JuiceFS. Only core metrics (e.g. version number) will be reported, and user data and any other sensitive data will not be included. The related code can be viewed here.

You could also disable reporting easily by command line option --no-usage-report:

juicefs mount --no-usage-report

License

JuiceFS is open-sourced under Apache License 2.0, see LICENSE.

Credits

The design of JuiceFS was inspired by Google File System, HDFS and MooseFS. Thanks for their great work!

FAQ

Why doesn't JuiceFS support XXX object storage?

JuiceFS supports many object storage. Please check out this list first. If the object storage you want to use is compatible with S3, you could treat it as S3. Otherwise, try reporting issue.

Can I use Redis Cluster as metadata engine?

Yes. Since v1.0.0 Beta3 JuiceFS supports the use of Redis Cluster as the metadata engine, but it should be noted that Redis Cluster requires that the keys of all operations in a transaction must be in the same hash slot, so a JuiceFS file system can only use one hash slot.

See "Redis Best Practices" for more information.

What's the difference between JuiceFS and XXX?

See "Comparison with Others" for more information.

For more FAQs, please see the full list.

Stargazers over time

Star History Chart