Content-Oblivious Leader Election on Rings

Fabian Frei; Ran Gelles; Ahmed Ghazy; Alexandre Nolin

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arXiv · 2405.03646

Content-Oblivious Leader Election on Rings

Fabian Frei·Ran Gelles·Ahmed Ghazy·Alexandre Nolin

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Abstract

In content-oblivious computation, n nodes wish to compute a given task over an asynchronous network that suffers from an extremely harsh type of noise, which corrupts the content of all messages across all channels. In a recent work, Censor-Hillel, Cohen, Gelles, and Sela (Distributed Computing, 2023) showed how to perform arbitrary computations in a content-oblivious way in 2-edge connected networks but only if the network has a distinguished node (called root) to initiate the computation. Our goal is to remove this assumption, which was conjectured to be necessary. Achieving this goal essentially reduces to performing a content-oblivious leader election since an elected leader can then serve as the root required to perform arbitrary content-oblivious computations. We focus on ring networks, which are the simplest 2-edge connected graphs. On oriented rings, we obtain a leader election algorithm with message complexity O(n*ID_max), where ID_max is the maximal assigned ID. As it turns out, this dependency on $ID_max$ is inherent: we show a lower bound of Omega(n*log(ID_max/n)) messages for content-oblivious leader election algorithms. We also extend our results to non-oriented rings, where nodes cannot tell which channel leads to which neighbor. In this case, however, the algorithm does not terminate but only reaches quiescence.

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Fabian Frei, Ran Gelles, Ahmed Ghazy, Alexandre Nolin. 2024-05-06. Content-Oblivious Leader Election on Rings. https://arxiv.org/abs/2405.03646

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