NDLI: Improving metadata management for small files in HDFS

Content Provider	IEEE Xplore Digital Library
Author	Mackey, G. Sehrish, S. Jun Wang
Copyright Year	2009
Description	Author affiliation: School of Electrical Engineering and Computer Science, University of Central Florida, Orlando (Mackey, G.; Sehrish, S.; Jun Wang)
Abstract	Scientific applications are adapting HDFS/MapReduce to perform large scale data analytics. One of the major challenges is that an overabundance of small files is common in these applications, and HDFS manages all its files through a single server, the Namenode. It is anticipated that small files can significantly impact the performance of Namenode. In this work we propose a mechanism to store small files in HDFS efficiently and improve the space utilization for metadata. Our scheme is based on the assumption that each client is assigned a quota in the file system, for both the space and number of files. In our approach, we utilize the compression method ‘harballing', provided by Hadoop, to better utilize the HDFS. We provide for new job functionality to allow for in-job archival of directories and files so that running MapReduce programs may complete without being killed by the JobTracker due to quota policies. This approach leads to better functionality of metadata operations and more efficient usage of the HDFS. Our analysis results show that we can reduce the metadata footprint in main memory by a factor of 42.
Starting Page	1
Ending Page	4
File Size	85743
Page Count	4
File Format	PDF
ISBN	9781424450114
ISSN	15525244
DOI	10.1109/CLUSTR.2009.5289133
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-31
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	File systems Application software Large-scale systems Data analysis File servers Engineering management Computer science Performance analysis Availability Computer architecture
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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