Abstract
The condition based approach consists in identifying sets of input vectors, called conditions, for which it is possible to design a protocol solving a distributed computing problem despite failures. In a recent work we have applied the condition based approach to the interactive consistency (IC) problem (the agreement problem where the processes have to agree on the vector of proposed values), and provided a characterization of the conditions that allow us to solve it in presence of up to f c process crashes and f e erroneous proposals. We have shown that these conditions correspond exactly to error correcting codes, where the errors can be erasures or modified values. Here, we investigate this set of conditions from a complexity perspective, and show that it actually consists of a hierarchy of classes of conditions, \(\mathcal{E}^{[\delta]}_{f_c,f_e}\), where δ is the degree of the condition (0 ≤ δ ≤ f c ), each class being contained in the previous one (intuitively, the value f c -δ represents the “difficulty” of a class).
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Mostefaoui, A., Rajsbaum, S., Raynal, M., Roy, M. (2003). A Hierarchy of Conditions for Asynchronous Interactive Consistency. In: Malyshkin, V.E. (eds) Parallel Computing Technologies. PaCT 2003. Lecture Notes in Computer Science, vol 2763. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45145-7_11
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DOI: https://doi.org/10.1007/978-3-540-45145-7_11
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