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Paper Abstract and Keywords
Presentation 2018-03-01 11:10
Impact of Peer Churn on Average File Retrieving Time in Tit-for-Tat-based P2P File Distribution
Yutsuki Kayama, Masahiro Sasabe, Shoji Kasahara (NAIST) NS2017-181
Abstract (in Japanese) (See Japanese page) 
(in English) It has been pointed out that the free rider problem in P2P file distribution can be suppressed by Tit-for-Tat (TFT) strategy, which encourages peers in exchanging pieces, the fragments of original file, each other.
However, the optimality of such TFT-based P2P file distribution has not been fully revealed.
In this paper, we analyze how peer churn, which consists of sudden peer departure and arrival, affects on the average file retrieving time.
Specifically, we focus on situations before and after peer churn and formulate P2P file distribution in these situations as determination problems of optimal piece flow.
Since these problems can be modeled as Integer Linear Programming (ILP), optimal solutions can be obtained by the existing linear solver.
Through numerical experiments, we first show the impact of peer churn on system performance is limited, if the churn scale is one.
We also show that there is a strongly positive correlation between piece rarity of departing peer and system performance of remaining peers.
On the other hand, we show the new arrival peer can smoothly start retrieving pieces compared with the remaining peers.
Finally, we show that the average file retrieving time of the whole system does not almost change, regardless of the scale and timing of peer churn.
Keyword (in Japanese) (See Japanese page) 
(in English) Tit-for-Tat-based P2P file distribution / peer churn / average file retrieving time / / / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 459, NS2017-181, pp. 79-84, March 2018.
Paper # NS2017-181 
Date of Issue 2018-02-22 (NS) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF NS2017-181

Conference Information
Committee NS IN  
Conference Date 2018-03-01 - 2018-03-02 
Place (in Japanese) (See Japanese page) 
Place (in English) Phoenix Seagaia Resort 
Topics (in Japanese) (See Japanese page) 
Topics (in English) General 
Paper Information
Registration To NS 
Conference Code 2018-03-NS-IN 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Impact of Peer Churn on Average File Retrieving Time in Tit-for-Tat-based P2P File Distribution 
Sub Title (in English)  
Keyword(1) Tit-for-Tat-based P2P file distribution  
Keyword(2) peer churn  
Keyword(3) average file retrieving time  
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1st Author's Name Yutsuki Kayama  
1st Author's Affiliation Nara Institute of Science and Technology (NAIST)
2nd Author's Name Masahiro Sasabe  
2nd Author's Affiliation Nara Institute of Science and Technology (NAIST)
3rd Author's Name Shoji Kasahara  
3rd Author's Affiliation Nara Institute of Science and Technology (NAIST)
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Speaker Author-1 
Date Time 2018-03-01 11:10:00 
Presentation Time 20 minutes 
Registration for NS 
Paper # NS2017-181 
Volume (vol) vol.117 
Number (no) no.459 
Page pp.79-84 
#Pages 6 
Date of Issue 2018-02-22 (NS) 

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