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First step of “Chord”
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Yoshiaki Yoshida
September 23, 2016
Technology
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First step of “Chord”
First step of “Chord”
Yoshiaki Yoshida
September 23, 2016
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Transcript
First step of “Chord” 2016-09-23 ࣾษڧձ @kakakakakku
Cloud Computing Concepts, Part 1 by
࠷ۙ Coursera Ͱ ཤमͯ͠ΔߨٛͰֶΜͩ “Chord” ΛβοΫϦͱհ͠·͢
What is “Chord” ?
None
(ƅшƅ) ŴƅŜŖƃ ?
εέʔϥϏϦςΟͷ͋Δ P2P ୳ࡧΞϧΰϦζϜʢҙ༁ʣ → ൃද2001
[Related Algorithms] Tapestry Pastry Kademlia ʘ ࠓհ͠ͳ͍͚Ͳଞʹ͋Δ ʗ
[Related Implementation] Cassandra Dynamo Riak Voldemort ʘ ϛυϧΣΞΛΠϝʔδ͢Δͱۙײ༙͘ ʗ
ʘ Dynamo ͷจ·ͨผͷػձʹհ͠·͢ ʗ
P2P Λྨ͢Δͱ...
Unstructured Overlay Structured Overlay Chord Napster / Gnutella
Goal of “Chord”
େྔͷΩʔΛͲ͏ࢄͤ͞Δ ? େྔͷΩʔΛͲ͏ޮతʹ୳ࡧͤ͞Δ ? ϊʔυͷ૿ݮʹͲ͏ରԠ͢Δ ?
“Chord” = Consistent Hashing + Finger Table
(ƅшƅ) Űō?
Consistent Hashing ղઆ
None
ҰݴͰද͢ͱ Ωʔͷ࠶ஔͷӨڹΛݮͨ͠ ޮతͳϋογϡ๏ʢҙ༁ʣ
Bad Example ʘ ࠷ॳʹμϝͳྫΛݟͯΈ·͠ΐ͏ ʗ
3 Nodes 4 Keys ΩϨΠʹ ࢄͨ͠ ??? ୯७ʹ mod ͰΩʔΛϊʔυʹஔ͢Δͱ...
͠1 ނোͨ͠߹ ΦϨϯδҎ֎ શͯͷΩʔΛ࠶ஔ ͢Δඞཁ͕͋Δ
Consistent Hashing ొ
ϊʔυͱΩʔΛϋογϡԽͯ͠ ԾϦϯά্ʹஔ͢Δ ※ԾͷҙຯࠓճׂѪ͠·͢...
֤Ωʔ͔Βݟͯ ࣌ܭճΓʹ1൪ۙͨ͠ϊʔυʹ ΩʔΛஔ͢Δͱ͍͏ߟ͑ํ ʢͦͷϊʔυ Successor ͱݺͿʣ
Ϧϯάۭؒ ஔ ஔ ஔ
Ϧϯάۭؒ ނোͰ࠶ஔ͕ඞཁͳΩʔ ʹݮ͞ΕΔ ஔ ࠶ஔ ஔ
Αͬͯ ϊʔυՃʗނোʢҙਤతͳݮগʣ ʹରͯ͠ ہॴతͳӨڹʹ͑ΒΕΔ
Finger Table ղઆ
Chord ͷಛతͳΈ ! ҰݴͰද͢ͱγϣʔτΧοτతͳ ?
Bad Example ʘ ࠷ॳʹμϝͳྫΛݟͯΈ·͠ΐ͏ ʗ
୳ࡧ͢Δͱ͖ʹ key ͕͋Δ ୳ࡧΛϦΫΤετ ͢Δϊʔυ
ϊʔυΛॱ൪ʹḷͬͯ͠·͏ͱ ઢܗ୳ࡧʹͳͬͯ͠·͏… ʘ Oh, No! ʗ
Finger Table ొ
ҙͷϊʔυʹରͯ͠ ࢦؔతʹ୳ࡧՄೳͳ ϩέʔγϣϯʢҙ༁ʣΛఆΊͯ ଟஈ֊ʹ୳ࡧͤ͞Δ
͜ͷྫͩͱ m=3 ͰޮՌ͕ແͦ͞͏ʹݟ͑Δ͚Ͳ... Finger Table
ઢܗ୳ࡧΛճආͰ͖ΔͨΊ ۭؒͷεέʔϦϯάʹରͯ͠ ୳ࡧ࣌ؒେ͖͘ࠨӈ͞Εͳ͘ͳΔ ʘ Good! ʗ
“Chord” = Consistent Hashing + Finger Table ʘ βοΫϦͱཧղͯ͠Β͑ͨ ?
ʗ
࣮ࡍͷ “Chord” Ͱ ϊʔυΛ SHA-1(ip, port) Ͱஔͯ͠ ΩʔΛ SHA-1(key) Ͱஔ͢Δ
※SHA-1 ͳΒ 160 bit ͷۭؒͰදݱͰ͖Δ
·ͱΊ
ʑͬͯΔٕज़ ੈքதͷεΰΠਓ͕ͨͪߟ͑ͨ ΞϧΰϦζϜʹࢧ͑ΒΕ͍ͯΔʂ
ٕज़Λͨͩ͏͚ͩͰͳ͘ ཁૉٕज़Λཧղ͢Δ͜ͱॏཁʂ
To be continued …