[chord] Etna source

[Alex Tumanov]

Thanks a lot for your reply Athicha! I wanted to explore the possibility of using DHTs to provide a highly available service in the form of a set of stateful daemons in the backend that either link to a DHT library or talk to a co-located DHT-daemon. For all individual daemons to be able to process client requests simultaneously, the state stored on a DHT must be updated in an atomic fashion. I do not believe that you get this atomicity feature out of the box with Dhash/Chord stack(please do correct me if I'm wrong), and my hope is that the implementation of Etna on top of Dhash/Chord would address that. How would I use it, by the way, is there Etna-specific API exported to the client apps?

Incidentally, has there been any commercial adoption of either Dhash/Chord or Etna or both? The link you provided is interesting, but I was not able to find exactly in what fashion they are using the atomic DHT update algorithm? Would it, perhaps, be possible to get links to publications, or better yet, source code/documentation where this is discussed in more detail? Are there any other atomic mutable DHT implementations out there?

Thanks,
Alex.

----- Original Message ----
From: Athicha Muthitacharoen <athicha at csail.mit.edu>
To: Alex Tumanov <atumanov at yahoo.com>
Cc: chord at pdos.csail.mit.edu
Sent: Monday, January 21, 2008 11:35:09 AM
Subject: Re: [chord] Etna source


Hi Alex,

Thanks for your interest in Etna.  May I ask to which applications
you would like to apply atomic mutable DHT algorithms?  One project 
that is looking to apply the algorithm is the KnowARC project, 
http://www.knowarc.eu.

We have stopped Etna's development, and so it no longer works 
with the current Chord/DHash repository.  I've attached an older 
snapshot of the Chord/DHash repository with the code for Etna 
(which is in the sfsnet/dhc subdirectory).  Hope you find useful.

Athicha

Alex Tumanov [atumanov at yahoo.com] wrote:
>Greetings,
>
>I was searching for mutable DHT solutions/open source implementations
 out there and came across a CSAIL paper on Etna:
>http://publications.csail.mit.edu/tmp/MIT-CSAIL-TR-2005-044.pdf 
>The authors point to http://pdos.csail.mit.edu/chord/ for Etna's
 source, but I couldn't find it there. The listed page is home to Chord/Dhash
 only, as far as I could see. Could you please point me in the right
 direction or let me know where/how I can get the source for Etna? Also,
 since this publication dates back to 2005, it is quite possible that
 CSAIL or other research labs have come up with enhanced, more robust, or
 otherwise better implementations of atomic update mutable DHT's. If you
 know of any such projects please do let me know as well.
>
>Thanks in advance!
>Alex.
>
>
>
>
>    
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