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Added a section about load balancing.

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niklas 2011-04-12 12:38:33 +02:00
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@ -1059,6 +1059,63 @@ As mentioned in the purpose section there are two different types of scalability
The GGS should be able to scale well in both categories. The GGS should be able to scale well in both categories.
\end_layout \end_layout
\begin_layout Subsection
Load balancing
\end_layout
\begin_layout Standard
The need for load balancing varies between different kind of systems.
Small systems that only use one or a couple of servers can cope with a
simple implementation of it, while in large systems it is critical to have
extensive and well working load balancing.
The need also depends on what kind of server structure that the system
works on.
A static structure where the number of servers are predefined or a dynamic
structure where the number varies.
\end_layout
\begin_layout Standard
Load balancing and scaling is difficult in different scenarios.
When running in a separate server park, there are a set number of servers
available, this means that an even distribution on all servers is preferable.
When running the GGS in a cloud, such as Amazon EC2, it is possible to
add an almost infinite number of servers as execution goes on.
In this cloud setting, it may be more important to evenly distribute load
on newly added servers.
\end_layout
\begin_layout Standard
Two methods of balancing load (increasing structure):
\end_layout
\begin_layout Itemize
Fill up the capacity of one server completely, and then move over to the
next server
\end_layout
\begin_layout Itemize
Evenly distribute all clients to all servers from the beginning, when load
becomes too high on all of them, then comes a new problem:
\end_layout
\begin_deeper
\begin_layout Itemize
How do we distribute load on these new servers?
\end_layout
\end_deeper
\begin_layout Standard
Load balancing is a key component to achieve scalability in network systems.
The GGS is a good example of a system that needs to be scalable, to attain
this load balancing is necessary.
Optimization of the load balancing for a system is an important task to
provide a stable and fast load balancer.
There are certain persistence problems that can occur with load balancing,
if a player moves from a server to another data loss may occur.
This is an important aspect to consider when the load balancer is designed
and implemented.
\end_layout
\begin_layout Standard \begin_layout Standard
\begin_inset Note Note \begin_inset Note Note
status open status open