|Initial release||2 April 2019|
7.20.0 / 12 April 2019
|Type||Special file system|
fs123 is a scalable, high-performance, caching, network filesystem. . The work surrounding the project has been submitted for presentation at the Open Source Summit North America 2019 in the file systems track. 
A simple web protocol with just 6 request types leverages the entire HTTP ecosystem (load balancers, proxies, redirects, etc.) and makes it easy to implement and debug custom file servers.
fs123 provides consistency guarantees with path-specific, configurable timeouts, which enables aggressive in-kernel, local-disk, and shared HTTP-proxy caching of positive and negative accesses. It accelerates PATH or PYTHONPATH searches, and is WAN/cloud-friendly. These properties allow implementing a software garden  of composable modules in a high performance way.
The client and server are written in C++. Each is a single user-space binary that does not require root privileges. The client uses the FUSE low-level API, and can work through network outages (or even offline) once the on-disk cache is primed. The libevent-based server easily delivers data at 40Gbps.
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