Latency Optimization of Distributed Key-value Store Based on RDMA

Abstract

Abstract: Distributed key-value store is widely used in industry， and methods to improve the performance of data transfer in distributed key-value store has drawn great interests in the study of distributed systems and parallel computing. RDMA （Remote Memory Direct Access） is a popular network technology in high-performance computing. Making use of its low latency and high bandwidth features can lead to enormous improvement of the performance of distributed key-value store. MPI offers routines to perform remote memory access （RMA）， also known as one-sided communication， which can benefit from RDMA technology. In this paper， we propose leverageing MPI one-sided communication refactors key-value operations and redesigns the communication model according to the features of one-sided communication. To solve the data inconsistency problem brought by RMA， we modify the storage structure of key-value pair and schedule the communication strategy. We evaluate the improvement by comparing the latency of RMA based key-value operations and TCP/IP based key-value operations when transferring key-value pairs of different lengths and get positive result.

Key words: distributed key-value store, RDMA, one-sided communication

WANG Zhe, WANG Yu-mei, WU Ya-fei, ZANG Yi-hua. Latency Optimization of Distributed Key-value Store Based on RDMA[J]. Computer and Modernization, 2023, 0(02): 24-27.

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