Danezis, George;
Kokoris-Kogias, Lefteris;
Sonnino, Alberto;
Spiegelman, Alexander;
(2022)
Narwhal and Tusk: A DAG-based Mempool and Efficient BFT Consensus.
In:
EuroSys '22: Proceedings of the Seventeenth European Conference on Computer Systems.
(pp. pp. 34-50).
Association for Computing Machinery: Rennes, France.
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Abstract
We propose separating the task of reliable transaction dissemination from transaction ordering, to enable high-performance Byzantine fault-tolerant quorum-based consensus. We design and evaluate a mempool protocol, Narwhal, specializing in high-throughput reliable dissemination and storage of causal histories of transactions. Narwhal tolerates an asynchronous network and maintains high performance despite failures. Narwhal is designed to easily scale-out using multiple workers at each validator, and we demonstrate that there is no foreseeable limit to the throughput we can achieve. Composing Narwhal with a partially synchronous consensus protocol (Narwhal-HotStuff) yields significantly better throughput even in the presence of faults or intermittent loss of liveness due to asynchrony. However, loss of liveness can result in higher latency. To achieve overall good performance when faults occur we design Tusk, a zero-message overhead asynchronous consensus protocol, to work with Narwhal. We demonstrate its high performance under a variety of configurations and faults. As a summary of results, on a WAN, Narwhal-Hotstuff achieves over 130,000 tx/sec at less than 2-sec latency compared with 1,800 tx/sec at 1-sec latency for Hotstuff. Additional workers increase throughput linearly to 600,000 tx/sec without any latency increase. Tusk achieves 160,000 tx/sec with about 3 seconds latency. Under faults, both protocols maintain high throughput, but Narwhal-HotStuff suffers from increased latency.
| Type: | Proceedings paper |
|---|---|
| Title: | Narwhal and Tusk: A DAG-based Mempool and Efficient BFT Consensus |
| Event: | 17th European Conference on Computer Systems (EuroSys) |
| Location: | Rennes, FRANCE |
| Dates: | 5 Apr 2022 - 8 Apr 2022 |
| ISBN-13: | 9781450391627 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1145/3492321.3519594 |
| Publisher version: | https://doi.org/10.1145/3492321.3519594 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | BYZANTINE AGREEMENT, Byzantine Fault Tolerant, Computer Science, Computer Science, Hardware & Architecture, Computer Science, Information Systems, Computer Science, Software Engineering, Computer Science, Theory & Methods, Consensus protocol, Science & Technology, Technology |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Computer Science |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10172331 |
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