Many times it simply is not possible to satisfy all of your user load with a single server. When this is the case then your only option is to dedicate more than one server to satisfy your user requests, but dedicating more than one server to handle requests presents new challenges.
The primary challenge is how to respond when a server in the group goes down. Typically a server maintains stateful information about its users in a session object. It would be preferable if, when a server goes down, the user “falls over” to another server without being aware that he or she has changed servers. But in order for this to work, the user’s stateful information needs to be maintained in both the original server as well as the server that the user falls over to.
No comments:
Post a Comment