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Small change to 3.5.2

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Niklas Landin 2011-05-12 22:47:42 +02:00
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report.lyx
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@ -6060,8 +6060,9 @@ In Erlang, there is a simple version of supervisors.
No state of the processes being supervised is inspected. No state of the processes being supervised is inspected.
There is, however a specification of how the supervised processes should There is, however a specification of how the supervised processes should
behave, but on a higher level. behave, but on a higher level.
The specification describes things such as how many times in a given interval a child process may crash, which processes need restarting when The specification describes things such as how many times in a given interval
crashes occur, etc. a child process may crash, which processes need restarting when crashes
occur, etc.
\end_layout \end_layout
@ -6119,8 +6120,8 @@ reference "fig:The-supervisor-structure"
\begin_layout Standard \begin_layout Standard
A choice has been made to let faulty processes crash very easily when they A choice has been made to let faulty processes crash very easily when they
receive bad data, or something unexpected happens. receive bad data, or something unexpected happens.
The alternative to crashing would have been to try to fix this faulty The alternative to crashing would have been to try to fix this faulty data,
data, or to foresee the unexpected events. or to foresee the unexpected events.
This was not chosen since it is so simple to monitor and restart processes, This was not chosen since it is so simple to monitor and restart processes,
and so difficult to try to mend broken states. and so difficult to try to mend broken states.
This approach is something widely deployed in the Erlang world, and developers This approach is something widely deployed in the Erlang world, and developers
@ -6143,14 +6144,13 @@ Redundancy
\end_layout \end_layout
\begin_layout Standard \begin_layout Standard
The modules in the GGS are built to be capable of redundant operation. The modules in the GGS are built to be capable of redundant operations.
By adding a backup process to sensitive processes, the state can be kept By adding a backup process to sensitive processes, the state can be kept
in the event of a crash. in the event of a crash.
The coordinator of the GGS prototype has this backup feature built in. The coordinator of the GGS prototype has this backup feature built in.
The coordinator passes state along to the backup process which keeps the The coordinator passes state along to the backup process which keeps the
data safe. data safe.
In the event of a crash, the coordinator recovers the state from the backup If a crash occurs, the coordinator recovers the state from the backup process.
process.
Figure Figure
\begin_inset CommandInset ref \begin_inset CommandInset ref
LatexCommand ref LatexCommand ref