Tuesday, June 16, 2009

Opera Unite: Technology Fail

Today's big tech news is the announcement of also-ran browser company Opera and their Unite service.

The Promise of P2P
The concept sounds interesting enough: Give every client a built-in publishing mechanism so that users don't have to rely on intermediary services. The supposed advantages are plenty: Increased network resilience, lower content distribution costs, infinite horizontal scaling, democratisation of communication, etc.

For example: Micro blogging on your own edge service instead of on a centralised service like Twitter. Your followers receive updates directly from your computer. No more fail whale taking out the entire world's micro blogging.

Wrong Technology
Conceptually that sounds great but Opera chose to implement it using HTTP. They "solved" the problems of NAT/firewall piercing, and keeping content available when your computer goes offline, by building a massive proxy server for the whole world to use. Forgetting the privacy and security concerns, or even the cost of scaling that service, I just can't get over how stupid it is to have a centralised proxy when you're building a decentralised network. Sounds like all they had was a hammer and thought this problem was a nail.

Better Solution
At risk of just choosing a different hammer, I would suggest XMPP as a solution to the P2P problem. Its mix of a distributed federation of servers and out-of-band P2P connections solve a lot of the scaling problems that traditional client-server models have. XMPP comes with a lot of protocol infrastructure already in place which has been thought over and implemented by really smart people. Technologies like Pub-Sub, MUC and Jingle to accomodate many types of applications. Content addressing and discovering is provided already. Authentication, encryption and compression come out of the box. Content can be cached on the XMPP server or distributed through a pub-sub/muc service which has its own history storage.

So come on Opera... join the XMPP revolution! Let's build the real time web on technology that works.

Thursday, June 11, 2009

For Sale - Home Theatre - Location Mumbai

I'm selling my entire home theatre system as I'm leaving Mumbai and sadly cannot carry this with me. All components are in top condition and purchased about 7 months ago, with less than an hour a day of usage. Image and audio quality are as good as new. The new price was about Rs 1,00,000. I'm looking for Rs 70,000 for the entire system but will listen to any reasonable offer. Projector and screen must be sold together. Buyer can collect from Andheri West, Mumbai. Respond quickly: +91 9930358460 / cbas@pandion.be

Specs:

Sold! Logitech Z-5500
5.1 speakers, 505W RMS total power incl. 187W 10" subwoofer, optical and analog inputs, Dolby/DTS decoder, remote control, speaker cables, spare fuses for the amp
Compatible with computer, gaming console, MP3 player, mobile phone, BluRay/DVD player, TV set top box, ...
Incl. manuals, invoice and receipt from Ezone in Oberoi Mall
Target price: Rs 12,000


Sharp XV-Z3100
720p "HD Ready" projector, Japanese brand
Native resolution 1280x720 pixels
1000 ANSI lumens
6500:1 contrast ratio
Remote control
Input from VGA, HDMI, component, composite, S-video
Compatible with computer, gaming console, BluRay/DVD player, TV set top box, ...
Incl. manuals, invoice and receipt for 3 year local warranty in Singapore (Sim Lim Square)

Projection screen
8x6 feet (4:3 ratio, 120" diagonal)
8x4.5 feet (16:9 ratio, 110" diagonal)
High gain material
Spring mechanism with auto lock
Wall mount hooks included, ceiling mount also possible

VGA cable
15m length, noise-free image at HD resolutions

Target price: Rs 58,000 (projector+screen+cable)