[tahoe-dev] Fwd: LAFS performance

Zooko O'Whielacronx zooko at zooko.com
Fri Jul 16 18:29:10 UTC 2010

---------- Forwarded message ----------
From: Nikita Borisov <nikita at illinois.edu>
Date: Tue, Jul 6, 2010 at 1:04 PM
Subject: LAFS performance
To: zooko <zooko at zooko.com>


I'm working on a project building decentralized social networks, and
I'm trying to think about how to design a storage layer for it.  We
took a brief look at Tahoe-LAFS, but one concern I have about the
implementation is that, to read a single file, you have to pick up a
bunch of pieces that are scattered around the world on different
nodes, and that seems like it would significantly impact performance.
I didn't see any measurements in the papers I read on the website,
have you guys run up against this / looked into potential solutions?
Do you have any studies of caching or load balancing in Tahoe?

Also, have you looked at the problem of denial-of-service attacks
where I try to erase your files by overwriting the data at the right
location in the hash table?  You won't be able to create anything
authentic, but it still seems like a problem.  Is that what the Verify
caps are for?

- Nikita
Nikita Borisov - http://hatswitch.org/~nikita/
Assistant Professor, Electrical and Computer Engineering
Tel: (217) 903-4401, Office: 460 CSL

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