Speaking of SOB, we're working on getting the code to our "dci (Digital City) module" ready for release to the Open source community. This module contains the following items which folks may find interesting:

* SOB - Dossy described this below. Basically it's what we use at AOL to "forward cache" content.
* Network Poll - Provides a simple mechanism to create member facing polls.
* Network Tally - Allows one to aggregate counts for keys. We've used this in the past to track things like user views of a particular venue. * Network Comment Boards - Allows one to easily create and add comment boards to your application. * Network NV (network variables) - Similar to nsv, but allows updates to be distributed to many clients. Allows you to update variables on a single NV writer, and have those changes broadcast out to many front-end readers. * Network Eval - Allows you to send Tcl scripts to be evaluated to many other servers.

Those are the really big things. They've been at use at AOL since the early Digital City days, and although relatively simplistic in their design - most assume single-writer for instance, they have shown themselves to be quite robust.

Stay tuned for the release of the "nsdci" module! ;-)

- n

On 2006.07.03, John Buckman <[EMAIL PROTECTED]> wrote:
In my experience, many  applications that use SQL actually only need
key-lookup capability [...]

Which is why, at AOL, a large part of the web publishing architecture
utilizes Small Object Broker (SOB), which can be set up in a distributed
(master-slave style) network based service with client-side read
caching with flush-on-write.  This lets you simply scale your key-based
query infrastructure horizontally.

Initially, I think some of the "conventional wisdom" at the
high-scalability end runs counter to what the majority of web developers
have discovered and learned because almost any reasonable solution will
work "in the small" which is where most web projects live.  In those
problem sets, tools and solutions which have a shallower learning curve
and offer more functionality "out of the box" yield faster development
times and empower developers to be productive with a smaller skill set.
However, there's a line (I couldn't yet tell you exactly where it is),
that once you cross it, the characteristics of the problem set changes
and the optimal (and sometimes only) solutions become very specialized.
It's at this end of the spectrum where AOLserver truly shines, but it's
a very small set.

John, it's fantastic to see you're actively looking at and working with
AOLserver.  From the list archives, it looks like your first message
came through around 15 Apr 2006.  I'm hoping that your interest in
AOLserver might mean that the upcoming version of Lyris may replace
tclhttpd with AOLserver?  Or are you working with AOLserver for
something different (i.e., Magnatune)?

-- Dossy

AOLserver - http://www.aolserver.com/

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