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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.
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Indexing: The CDS/ISIS package indexes all fields selected for indexing into a single file. This file is known as 'inverted file'. There are indexing techniques for building i
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Software project planning entails what activities?
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Regression testing It is the re-execution of some subset of tests that have already been conducted to make sure the changes that have not been propagated unintended side effect
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Productivity Productivity refers to metrics and calculates of output from production processes, per unit of input. Productivity P may be conceived of as a metrics of the techni
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