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rewriten 2.4 Availability

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Jeena Paradies 2011-04-04 16:44:27 +02:00
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@ -746,27 +746,37 @@ Availability
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
One important factor of a server is the availability, a server that you One important factor of any server is the availability.
can not connect to is a bad server. A server to which you are unable to connect to is a useless server.
Erlang has several features to increase the availability, for example hot Other then within telecomunication, their uptime is of about 99,99%, the
code replacement. game developer community hasn't approched this problem very genuinely yet
It is also critical to have a good design, we want to separate each part so there is much room for improvement.
of the server and thus avoiding that the whole server will crash.
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
\begin_inset Note Note There are several good papers on how to migrate whole virtual machines between
status open nodes to replicate them but for the GGS a different approche has been chosen.
Instead of just duplicating a virtual machine, the programming language
\begin_layout Plain Layout Erlang has been used which offers several features to increase the availability.
Players are unsatisfied with the service of WoW Telecoms have the same problem Some of them are
of having to migrate users from one node to another, this is called handover. \emph on
\end_layout hot code replacement
\emph default
\end_inset , where code can be updated while the application is running and without
the need to restart it, the
\emph on
supervisor structure
\emph default
provided by
\emph on
OTP
\emph default
and the inter node and process communication via
\emph on
messages
\emph default
instead of shared memory.
We will discuss each of them later on.
\end_layout \end_layout
\begin_layout Section \begin_layout Section