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An Empirical Performance Analysis on Hadoop via Optimizing the Network Heartbeat Period
( Jaehwan Lee ),( June Choi ),( Hongchan Roh ),( Ji Sun Shin ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.11
To support a large-scale Hadoop cluster, Hadoop heartbeat messages are designed to deliver the significant messages, including task scheduling and completion messages, via piggybacking to reduce the number of messages received by the NameNode. Although Hadoop is designed and optimized for high-throughput computing via batch processing, the real-time processing of large amounts of data in Hadoop is increasingly important. This paper evaluates Hadoop’s performance and costs when the heartbeat period is controlled to support latency sensitive applications. Through an empirical study based on Hadoop 2.0 (YARN) [1] architecture, we improve Hadoop’s I/O performance as well as application performance by up to 13 percent compared to the default configuration. We offer a guideline that predicts the performance, costs and limitations of the total system by controlling the heartbeat period using simple equations. We show that Hive performance can be improved by tuning Hadoop’s heartbeat periods through extensive experiments.
FPGA를 이용한 우주전파영상 합성용 디지털 상관기 개발에 관한 연구
염재환(Jaehwan Yeom),정구영(Gooyoung Jeong),노덕규(Dukgyoo Roh),오세진(Sejin Oh),김광동(Kwangdong Kim),이창훈(Changhoon Lee) 대한전자공학회 2006 대한전자공학회 학술대회 Vol.2006 No.11
In this paper, we propose a method of development of 2bit high speed digital correlator for integration of radio astronomical image by using FPGA.