1. WheelFS Jeremy Stribling, Frans Kaashoek, Jinyang Li, Robert Morris
MIT CSAIL and New York University

2. I Want to Publish an SOSP Paper
But I don’t want to do a lot of work
Idea: New cooperative Web cache!

3. Exploit a Network File System
Apache
Caching
Proxy
Apache
Caching
Proxy
Apache
Caching
Proxy
Apache
Caching
Proxy
foo.html
Network File Server
(/mnt/awesome-cdn/cache)

4. It Is Too Good to Be True Tries to mask failures with long timeouts
Strict consistency prevents use of cached data under failures
My naïve SOSP strategy might not work

5. So What Are My Options? Give up dream and just not graduate
Submit random paper [Rooter, WMSCI ’05]
Build an FS that would work for real apps
Apache can use old copies of data
And can always fall back to the origin
Why not tell the FS?

6. WheelFS: Storage for Wide-area Apps
File system API
Semantic cues give apps control of behavior under failures
 Make Apache distributed with 1 line change

7. Cooperative Web Cache on WheelFS
Apache
Caching
Proxy
Apache
Caching
Proxy
Apache
Caching
Proxy
Apache
Caching
Proxy
WheelFS
WheelFS
WheelFS
WheelFS
/wfs/cache/
.maxtime=500
/.bestversion
/.lax
/$URL
Use newest version you can find quickly
Allow multiple versions of a directory to be updated
Time out operations after T milliseconds

8. I’m Running Out of Time, So:
A compact but powerful set of cues
Useful to other applications, including:
PlanetLab measurement studies
Parallel Grid computations
Distribute make
See you at the next big conference!