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Distributed Algorithms by Nancy A. Lynch

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Chapter 7 More Consensus Problems

The past two chapters have been devoted to consensus problems—Chapter 5 to the coordinated attack problem and Chapter 6 to the agreement problem. In this chapter, we finish our study of synchronous distributed consensus by considering three other consensus problems: the k-agreement problem, the approximate agreement problem, and the distributed database commit problem. As in Chapter 6, we consider process failures only.

7.1 k-Agreement

The first problem we consider is the k-agreement problem, where k is some nonnegative integer. The k-agreement problem is a natural generalization of the ordinary agreement problem considered in Chapter 6. But now, instead of requiring that all processes decide on exactly the ...

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