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QUESTION - Fault Tolerance
(a) Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a failure typically takes four hours to fix. What is the availability of the replicated service?
(b) In the gossip architecture, why does a replica manager need to keep both a ‘replica' timestamp and a ‘value' timestamp?
(c) Explain the difference between linearizability and sequential consistency, and why the latter is more practical to implement, in general.
(d) Explain why allowing backups to process read operations leads to sequentially consistent rather than linearizable executions in a passive replication system.
Explain the persistent class maps to one relational table In most of cases, persistent class maps to one relational table (keeping aside inheritance issue, for the moment). In
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Dear Sir/ Madam I have some remaining test questions need to be answered, from yesterday''s test bank can I get a solution please? Regards John
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