Time to play with HA ejabberd setup now.
It was said number of daily active user will be less than 1M, and IM is just a feature of the mobile product, and believe that people will spend less then 2 hours on it everyday, also people will use the App mainly during traffic hours. So it’s 2M hours span to 7~9am and 6~8pm, 4 hours. I would like to assume it is evenly distributed, this makes the concurrent online user … 500K, Not a big number, and since it is just a non-key feature, so activities will be limited.
So I think I’d go with a full replicated ejabberd cluster, “full” means I’m going to replicate everything – password, roster, offline message. I will check the stats of the production environment to see how the resource utilization is going, and tune the allocation whenever necessary. Continue reading »