zhjchv0317I think Jack Moffit, always replica handbags excellent, is being hard on Alex Payne and the Twitter gang. He is criticising Twitter for restricting access to the firehose - the XMPP stream of events - "tweets" in Twitter parlance. Jack alludes to a strategic reason for this, as in - twitter 'own' the data and therefor should own the derivative value obtained from analysing or reorganising the data.
"I don’t know the exact timeReplica Louis Vuitton that they started pruning the list of consumers of the firehose, but to me it seemed like this starting happening after Summize was acquired or around that time. The logical conclusion from this is that Twitter does not want more interesting things being built on top of its data."I'm guessing the reason is not just that, although we do know that Twitter will be announcing a business plan a few quarters out. The other reason might be scale.
Scale? It's received wisdomdesigner handbags that heavy HTTP polling is stupid and wrong, whereas push is both more efficient and more optimal. The problem is there isn't much science or shared field experience on what it means to have a public XMPP data and notification endpoint with a lot of subscribers. When I say a lot, I mean 250,000 to 1M clients holding open connections to your server.
Issues I've seen are that load Replica Watchesbalancing becomes a problem, db access costs dominate login times for clients, and XMPP server clustering isn't as far along as I'd thought it was. Scaling XMPP does not appear to be a commodity problem the way HTTP scaling is - you are back down to looking at whether/if the servers are using epoll/nio;
whether load balancing should be done by clients
My suspicion is that services Omega replica Watchespushing out notifications to a number if subscribers (Sn) where that number is large is not yet a panacea to web poll scaling issues because there is latent asymmetry in the costs of pushing out events to increasing numbers despite it being more peformant and less latent for smaller values of Sn.
And that service providers will needSwiss replica Watches to look carefully at graph theory, flooding and gossip/propogation models to get pub/sub notifications to meet web scale delivery - and at that point we'll be half-way to either a peer to peer model, or usenet - take your pick It's like being back in 2000 and wistfully reading Dan Kegel's c10k page.
