I'm looking to develop a chat similar to Facebook's chat feature.
Using Comet would require more memory to maintain the connection.
There seems to be a latency issue when using Ajax polling if requests are sent every 3-4 seconds.
Considering that latency isn't a major concern, would Ajax Polling be the better option in this scenario?
Aside from latency, another issue arises with using COMET (long-polling). This method "saves" your traffic by continuously checking for updates on the server. However, this means that some of the calls made could be unnecessary and a waste of resources, especially if there are no changes occurring. With COMET, only one call is generally needed to receive an update from the server with a 100% success rate.
@Vasil: "you can maintain millions of active connections"
Check out this issue
And regarding the misconception that NIO is superior to IO.
The article on iobound demonstrates that IO actually performs better than NIO and indeed, IO reaches its memory limit before NIO (incidentally, the author did not attempt to decrease the stack memory with a lower value).
In situations where latency is not a concern, AJAX may be the preferable option over Comet. Comet can face challenges when it comes to managing multiple connections between the same client and server unless handled with extreme caution. (Reference)
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