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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.
What is the difference among an implicit and an explicit conceptual model?
1. Testing that employs a test data selection method designed to obtain test data capable of demonstrating the absence of a set of pre-specified faults, typically, frequently happe
What are the umbrella activities of a software process? Software project tracking and control. Risk management. Software Quality Assurance. Formal Technical Reviews.
What is a data object? Data object is a collection of attributes that act as an aspect, characteristic, quality, or descriptor of the object.
Define software process. Software process is explained as the structured set of activities that are needed to develop the software system.
QUESTION (a) Explain why making some replica managers read-only may improve the performance of a gossip system. (b) In the gossip architecture, why does a replica manager ne
What are the Problems in comes in SRS There are numerous features which make requirements analysis difficult. These are explained below: 1. Complete requirements are diffic
What is Requirements Definition Description Output of requirements of engineering process is Requirements Definition Description (RDD). Requirements engineering can be defined
Question: (a) Shneiderman's eight golden rules for dialogue design are (1) strive for consistency, (2) enable frequent users to use shortcuts, (3) give informative feedback,
assignment
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