NDLI: One Phase Commit: A Low Overhead Atomic Commitment Protocol for Scalable Metadata Services

Content Provider	IEEE Xplore Digital Library
Author	Congiu, G. Grawinkel, M. Narasimhamurthy, S. Brinkmann, A.
Copyright Year	2012
Abstract	As the number of client machines in high end computing clusters increases, the file system cannot keep up with the resulting volume of requests, using a centralized metadata server. This problem will be even more prominent with the advent of the exascale computing age. In this context, the centralized metadata server represents a bottleneck for the scaling of the file system performance as well as a single point of failure. To overcome this problem, file systems are evolving from centralized metadata services to distributed metadata services. The metadata distribution raises a number of additional problems that must be taken into account. In this paper we will focus on the problem of managing distributed namespace operations such as CREATE, DELETE and RENAME. Distributed namespace operations are a side effect of metadata distribution across the cluster of metadata servers. Available protocols for handling distributed namespace operations such as the two phase commitment protocol are expensive since they require the exchange of a large number of messages between metadata servers as well as synchronous writes to stable storage to log vital information. Moreover, such protocols adopt locking schemes to protect the resource during the operation, which force multiple operations on the same directory to be serialized. This severely impacts the performance of high performance computing applications in typical scenarios such as high rate of file create operations. We propose a one phase commit protocol that is tailored to the use for typical inter-metadata messages. We rely on a fast, highly available shared storage for metadata in order to minimize writes, messages, coordination overhead and recovery time in case of failing metadata servers. We present a formal description of the new protocol, a theoretical analysis of its capabilities, a proof of correctness and the evaluation of the protocol in a simulated environment that renders the protocol to be fast and reliable. In simulations the protocol achieved more than 50% better performance compared with the two phase commitment protocol.
Starting Page	16
Ending Page	24
File Size	296557
Page Count	9
File Format	PDF
ISBN	9781467328937
e-ISBN	9780769548449
DOI	10.1109/ClusterW.2012.16
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-09-24
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Protocols Exascale computing System performance Distributed databases Computer architecture Distributed namespace Computer crashes Computing clusters Servers Distributed metadata Optimization
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
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
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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