Small change to 3.5.2
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14
report.lyx
14
report.lyx
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@ -6060,8 +6060,9 @@ In Erlang, there is a simple version of supervisors.
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No state of the processes being supervised is inspected.
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There is, however a specification of how the supervised processes should
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behave, but on a higher level.
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The specification describes things such as how many times in a given interval a child process may crash, which processes need restarting when
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crashes occur, etc.
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The specification describes things such as how many times in a given interval
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a child process may crash, which processes need restarting when crashes
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occur, etc.
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\end_layout
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@ -6119,8 +6120,8 @@ reference "fig:The-supervisor-structure"
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\begin_layout Standard
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A choice has been made to let faulty processes crash very easily when they
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receive bad data, or something unexpected happens.
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The alternative to crashing would have been to try to fix this faulty
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data, or to foresee the unexpected events.
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The alternative to crashing would have been to try to fix this faulty data,
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or to foresee the unexpected events.
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This was not chosen since it is so simple to monitor and restart processes,
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and so difficult to try to mend broken states.
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This approach is something widely deployed in the Erlang world, and developers
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@ -6143,14 +6144,13 @@ Redundancy
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\end_layout
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\begin_layout Standard
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The modules in the GGS are built to be capable of redundant operation.
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The modules in the GGS are built to be capable of redundant operations.
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By adding a backup process to sensitive processes, the state can be kept
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in the event of a crash.
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The coordinator of the GGS prototype has this backup feature built in.
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The coordinator passes state along to the backup process which keeps the
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data safe.
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In the event of a crash, the coordinator recovers the state from the backup
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process.
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If a crash occurs, the coordinator recovers the state from the backup process.
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Figure
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\begin_inset CommandInset ref
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LatexCommand ref
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