What's an SMT server?

How do I manage server side database in open fire server for 1 million users for my application like whats app?

• I need your advice... See we are working on the application similar as the Whatsapp. We almost completed it in android... We are using open fire server (http://en.wikipedia.org/wiki/Openfire) to manage the database. Open fire is the open source for this.. Now we need to manage 1 million users in the open fire server for this application so it is possible? And if yes then how? See below given image: Here each connection manager handles 5000 users so I want to ask you that if I create 200 connection managers to handle 1 million users... So it is like 200connection manager * 5000users = 1million user so is it possible? Do you have any idea about this? Here i also mention our query: How many open fire server How many databases How many storage servers How many connection manage server And how may licenses for 1 million user

• Answer:

  WhatsApp is a proprietary service using a number of technologies, so it's really hard to tell how they built it to scale so well. I'm not sure how Open Fire works in this context, but there are some lessons you can still learn from some of the informations available on the web about WhatsApp. For example, from a quick look at http://en.wikipedia.org/wiki/WhatsApp#Technical we learn that they have deployed a customised version of XMMP, a notorious Internet Messaging protocol (previously used by Google Talk, for example). So the question becomes "how to build a scalable XMMP service?" in general and using such answer you can then try and adapt the solution to the specifics of Open Fire, which is pretty standard XMMP. That said, a lean approach to this could be to use cloud computing and buy some allocation on Amazon Web Services or other provider to begin with and assess the usage. However, if you have your own server cloud this can be basically the same, but you will need to have resources to make sure that the uptime is constant. Also, a good search on stackoverflow comes with interesting results about specific issues implementing XMMP, for example http://stackoverflow.com/questions/5453029/pros-and-cons-of-xmpp-servers