Proxy Responses by FPGA-Based Switch for MapReduce Stragglers

Koya MITSUZUKA  Michihiro KOIBUCHI  Hideharu AMANO  Hiroki MATSUTANI  

IEICE TRANSACTIONS on Information and Systems   Vol.E101-D   No.9   pp.2258-2268
Publication Date: 2018/09/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2017EDP7287
Type of Manuscript: PAPER
Category: Computer System
FPGA,  MapReduce,  straggler,  

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In parallel processing applications, a few worker nodes called “stragglers”, which execute their tasks significantly slower than other tasks, increase the execution time of the job. In this paper, we propose a network switch based straggler handling system to mitigate the burden of the compute nodes. We also propose how to offload detecting stragglers and computing their results in the network switch with no additional communications between worker nodes. We introduce some approximate techniques for the proxy computation and response at the switch; thus our switch is called “ApproxSW.” As a result of a simulation experiment, the proposed approximation based on task similarity achieves the best accuracy in terms of quality of generated Map outputs. We also analyze how to suppress unnecessary proxy computation by the ApproxSW. We implement ApproxSW on NetFPGA-SUME board that has four 10Gbit Ethernet (10GbE) interfaces and a Virtex-7 FPGA. Experimental results shows that the ApproxSW functions do not degrade the original 10GbE switch performance.