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JuiceFS is an open-source POSIX file system built on top of Redis and object storage (e.g. Amazon S3), designed and optimized for cloud native environment. By using the widely adopted Redis and S3 as the persistent storage, JuiceFS serves as a stateless middleware to enable many applications to share data easily.
The highlighted features are:
In addition, there are some other features:
Architecture | Getting Started | Administration | POSIX Compatibility | Performance Benchmark | Supported Object Storage | Status | Roadmap | Reporting Issues | Contributing | Community | Usage Tracking | License | Credits | FAQ
JuiceFS relies on Redis to store file system metadata. Redis is a fast, open-source, in-memory key-value data store and very suitable for storing the metadata. All the data will store into object storage through JuiceFS client.
The storage format of one file in JuiceFS consists of three levels. The first level called "Chunk". Each chunk has fixed size, currently it is 64MiB and cannot be changed. The second level called "Slice". The slice size is variable. A chunk may have multiple slices. The third level called "Block". Like chunk, its size is fixed. By default one block is 4MiB and you could modify it when formatting a volume (see following section). At last, the block will be compressed and encrypted (optional) store into object storage.
You can download precompiled binaries from releases page.
You need first installing Go 1.14+ and GCC 5.4+, then run following commands:
$ git clone https://github.com/juicedata/juicefs.git $ cd juicefs $ make
For users in China, it's recommended to set
GOPROXY to speed up compilation, e.g. Goproxy China.
A Redis server (>= 2.8) is needed for metadata, please follow Redis Quick Start.
macFUSE is also needed for macOS.
The last one you need is object storage. There are many options for object storage, local disk is the easiest one to get started.
Assume you have a Redis server running locally, we can create a volume called
test using it to store metadata:
$ ./juicefs format localhost test
It will create a volume with default settings. If there Redis server is not running locally, the address could be specified using URL, for example,
redis://username:password@host:6379/1, the password can also be specified by environment variable
REDIS_PASSWORD to hide it from command line options.
Note: After Redis 6.0.0,
AUTH command was extended with two arguments, i.e. username and password. If you use Redis < 6.0.0, just omit the username parameter in the URL, e.g.
As JuiceFS relies on object storage to store data, you can specify a object storage using
--secret-key. By default, it uses a local directory to serve as an object store, for all the options, please see
./juicefs format -h.
For the details about how to setup different object storage, please read the guide.
Once a volume is formatted, you can mount it to a directory, which is called mount point.
$ ./juicefs mount -d localhost ~/jfs
After that you can access the volume just like a local directory.
To get all options, just run
./juicefs mount -h.
If you wanna mount JuiceFS automatically at boot, please read the guide.
There is a command reference to see all options of the subcommand.
Using JuiceFS on Kubernetes is so easy, have a try.
If you wanna use JuiceFS in Hadoop, check Hadoop Java SDK.
JuiceFS passed all of the 8813 tests in 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
Besides the things covered by pjdfstest, JuiceFS provides:
JuiceFS provides a subcommand to run a few basic benchmarks to understand how it works in your environment:
$ ./juicefs bench /jfs Written a big file (1024.00 MiB): (113.67 MiB/s) Read a big file (1024.00 MiB): (127.12 MiB/s) Written 100 small files (102.40 KiB): 151.7 files/s, 6.6 ms for each file Read 100 small files (102.40 KiB): 692.1 files/s, 1.4 ms for each file Stated 100 files: 584.2 files/s, 1.7 ms for each file FUSE operation: 19333, avg: 0.3 ms Update meta: 436, avg: 1.4 ms Put object: 356, avg: 4.8 ms Get object first byte: 308, avg: 0.2 ms Delete object: 356, avg: 0.2 ms Used: 23.4s, CPU: 69.1%, MEM: 147.0 MiB
It shows JuiceFS can provide 10X more throughput than the other two, read more details.
It shows JuiceFS can provide significantly more metadata IOPS than the other two, read more details.
There is a virtual file called
.accesslog in the root of JuiceFS to show all the operations and the time they takes, for example:
$ cat /jfs/.accesslog 2021.01.15 08:26:11.003330 [uid:0,gid:0,pid:4403] write (17669,8666,4993160): OK <0.000010> 2021.01.15 08:26:11.003473 [uid:0,gid:0,pid:4403] write (17675,198,997439): OK <0.000014> 2021.01.15 08:26:11.003616 [uid:0,gid:0,pid:4403] write (17666,390,951582): OK <0.000006>
The last number on each line is the time (in seconds) current operation takes. You can use this directly to debug and analyze performance issues, or try
./juicefs profile /jfs to monitor real time statistics. Please run
./juicefs profile -h or refer to here to learn more about this subcommand.
For the detailed list, see this document.
It's considered as beta quality, the storage format is not stabilized yet. It's not recommended to deploy it into production environment. Please test it with your use cases and give us feedback.
Thank you for your contribution! Please refer to the CONTRIBUTING.md for more information.
JuiceFS by default collects anonymous usage data. It only collects core metrics (e.g. version number), no user or any sensitive data will be collected. You could review related code here.
These data help us understand how the community is using this project. You could disable reporting easily by command line option
$ ./juicefs mount --no-usage-report
JuiceFS is open-sourced under GNU AGPL v3.0, see LICENSE.
JuiceFS already supported many object storage, please check the list first. If this object storage is compatible with S3, you could treat it as S3. Otherwise, try reporting issue.
The simple answer is no. JuiceFS uses transaction to guarantee the atomicity of metadata operations, which is not well supported in cluster mode. Sentinal or other HA solution for Redis are needed.
See "Redis Best Practices" for more information.
See "Comparison with Others" for more information.
For more FAQs, please see the full list.