# Always be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-date Adversary

T. Götte, V.R. Vijayalakshmi, C. Scheideler, in: Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19), IEEE, n.d.

Conference Paper | Accepted | English
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Abstract
We investigate the maintenance of overlay networks under massive churn, i.e. nodes joining and leaving the network. We assume an adversary that may churn a constant fraction $\alpha n$ of nodes over the course of $\mathcal{O}(\log n)$ rounds. In particular, the adversary has an almost up-to-date information of the network topology as it can observe an only slightly outdated topology that is at least $2$ rounds old. Other than that, we only have the provably minimal restriction that new nodes can only join the network via nodes that have taken part in the network for at least one round. Our contributions are as follows: First, we show that it is impossible to maintain a connected topology if adversary has up-to-date information about the nodes' connections. Further, we show that our restriction concerning the join is also necessary. As our main result present an algorithm that constructs a new overlay- completely independent of all previous overlays - every $2$ rounds. Furthermore, each node sends and receives only $\mathcal{O}(\log^3 n)$ messages each round. As part of our solution we propose the Linearized DeBruijn Swarm (LDS), a highly churn resistant overlay, which will be maintained by the algorithm. However, our approaches can be transferred to a variety of classical P2P Topologies where nodes are mapped into the $[0,1)$-interval.
Publishing Year
Proceedings Title
Proceedings of the 2019 IEEE 33rd International Parallel and Distributed Processing Symposium (IPDPS '19)
Conference
2019 IEEE 33rd International Parallel and Distributed Processing Symposium (IPDPS '19)
Conference Location
Rio de Janeiro, Brazil
Conference Date
20.05.19 – 24.05.19
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### Cite this

Götte T, Vijayalakshmi VR, Scheideler C. Always be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-date Adversary. In: Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19). IEEE.
Götte, T., Vijayalakshmi, V. R., & Scheideler, C. (n.d.). Always be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-date Adversary. In Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19). Rio de Janeiro, Brazil: IEEE.
@inproceedings{Götte_Vijayalakshmi_Scheideler, title={Always be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-date Adversary}, booktitle={Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19)}, publisher={IEEE}, author={Götte, Thorsten and Vijayalakshmi, Vipin Ravindran and Scheideler, Christian} }
Götte, Thorsten, Vipin Ravindran Vijayalakshmi, and Christian Scheideler. “Always Be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-Date Adversary.” In Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19). IEEE, n.d.
T. Götte, V. R. Vijayalakshmi, and C. Scheideler, “Always be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-date Adversary,” in Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19), Rio de Janeiro, Brazil.
Götte, Thorsten, et al. “Always Be Two Steps Ahead of Your Enemy - Maintaining a Routable Overlay under Massive Churn with an Almost Up-to-Date Adversary.” Proceedings of the 2019 IEEE 33rd International Parallel  and Distributed Processing Symposium (IPDPS ’19), IEEE.
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