The Impact of RDMA on Agreement

Marcos K. Aguilera, Naama Ben-David, Rachid Guerraoui, Virendra Marathe, Igor Zablotchi
2019 Proceedings of the 2019 ACM Symposium on Principles of Distributed Computing - PODC '19  
Remote Direct Memory Access (RDMA) is becoming widely available in data centers. This technology allows a process to directly read and write the memory of a remote host, with a mechanism to control access permissions. In this paper, we study the fundamental power of these capabilities. We consider the well-known problem of achieving consensus despite failures, and find that RDMA can improve the inherent trade-off in distributed computing between failure resilience and performance. Specifically,
more » ... we show that RDMA allows algorithms that simultaneously achieve high resilience and high performance, while traditional algorithms had to choose one or another. With Byzantine failures, we give an algorithm that only requires n ≥ 2f P + 1 processes (where f P is the maximum number of faulty processes) and decides in two (network) delays in common executions. With crash failures, we give an algorithm that only requires n ≥ f P + 1 processes and also decides in two delays. Both algorithms tolerate a minority of memory failures inherent to RDMA, and they provide safety in asynchronous systems and liveness with standard additional assumptions.
doi:10.1145/3293611.3331601 dblp:conf/podc/AguileraBGMZ19 fatcat:ijm6ini3lrahpgzvorlodnk6e4