煦汃旦玄伊奈斥卞妏尹月井手仄木卅中失伙打伉朮丞

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The document discusses EpiChord, an enhancement of the Chord distributed hash table. It presents EpiChord's lookup algorithm and its division of the address space to reduce routing table sizes while maintaining low diameter. Bloom filters are also summarized, including how they represent sets using bit vectors and can check for set membership with possible false positives. Techniques like vector clocks for maintaining causality in distributed systems are also briefly covered.

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B. Leong et al. http://www.comp.nus.edu.sg/~bleong/slides/icon-epichord-slides.pdf

Address Space

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B. Leong et al. http://www.comp.nus.edu.sg/~bleong/slides/icon-epichord-slides.pdf

Mapping Keys to Nodes

1-6
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57
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B. Leong et al. http://www.comp.nus.edu.sg/~bleong/slides/icon-epichord-slides.pdf

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B. Leong et al. http://www.comp.nus.edu.sg/~bleong/slides/icon-epichord-slides.pdf

EpiChord Lookup Algorithm

B. Leong et al. http://www.comp.nus.edu.sg/~bleong/slides/icon-epichord-slides.pdf
EpiChord

Division of Address Space

?

J. Xu et al., On the Fundamental Tradeoffs between Routing Table Size and Network Diameter in Peer-to-Peer Networks

Lookup

(Dynamo?)

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S. Shinohara http://www.slideshare.net/shino/conflict-resolution-in-kai-presentation
VectorClocks

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BASE VectorClocks

S. Shinohara http://www.slideshare.net/shino/conflict-resolution-in-kai-presentation
VectorClocks

※concurrent§ (||)

BASE VectorClocks

T.Yamamuro

(postgresql＊s) 2-phase commit

T.Yamamuro
Sinfonia

2-phase commit＊s optimization

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T.Yamamuro
Sinfonia

mini-transaction primitives

T.Yamamuro
Sinfonia

Sinfonia＊s 2-phase commit
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T.Yamamuro
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Sinfonia 2-phase commit 5

T.Yamamuro
Sinfonia

Evaluation: Scalability

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250
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VectorClocks

Sinfonia
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Bloom

Bloom filter
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Bloom filter
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hi(x)
included
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1
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not included

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ZDD
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{abc, ab, ac, b, }
trie

0 (false)
1 (true)

S. Minato http://www-alg.ist.hokudai.ac.jp/~minato/alg2009-j.html
ZDD

BDD

S. Minato http://www-alg.ist.hokudai.ac.jp/~minato/alg2009-j.html
ZDD

S. Minato http://www-alg.ist.hokudai.ac.jp/~minato/alg2009-j.html
ZDD
BDD
ZDD: Zero-suppressed BDD

S. Minato http://www-alg.ist.hokudai.ac.jp/~minato/alg2009-j.html
ZDD

ZDD

??
??

??
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?? B. Leong et al., ※EpiChord: Parallelizing the Chord lookup algorithm with reactive
routing state management,§ Comput. Commun., vol.29, no.9, pp.1243-1259, 2006.
??
?? Sinfonia
?? M.K. Aguilera et al., ※Sinfonia: a new paradigm for building scalable distributed systems,§
Proc. of SOSP＊07, pp.159-174, 2007.
??
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?? S. Minato, ※Zero-suppressed BDDs for set manipulation in combinatorial problems,§
Proc. of DAC＊93, pp. 272-277, 1993.

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