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About: consistent hashing
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Harukasan
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February 27, 2017
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About: consistent hashing
Harukasan
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February 27, 2017
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Transcript
ӋԍӏӑӞԍӠӧӜӏӾʂҍ҅ѥ҈ ӬӆӏӮװɒױґҭѭѷҵ
ѵѵ҉ѥѧӧӜӏԍӇҊґ
ΌҐӄـҴΌҐӦـӡҍðҬƾ҈ҁѥ Ҋѥѧī
ֿ ׀ ׁ ׅ ׆ ׇ ֿ־ ֿ ׀ ׁ
ׂ ׃ ׄ ӄـ Ӧـӡ
ֿ ׀ ׁ ׅ ׆ ׇ ֿ־ ֿ ׀ ׁ
ׂ ׃ ׄ ˅ˤҍґѵѧҌ҆҈ҝѹѥ Ӧـӡ
ѵҮѮ҉ѯҭҊ ؆!ҐӏӼـӟҺԍӇ ؆ӄӼӜӏӾҐåࢄشࠓ´҆҈ҭҥ҅ ؆Ҍҍѭѣҭҥ҅ҴҌҵѭͮѥײѺҍåð ……ҊѭҠѣѥүѥүҊ¸ê
˕ӏԍӯԃҌȠʂ פӺӐӾԅʂץ
ֿ ׀ ׁ ֿ ׀ ׁ %3 = 1 %3
= 2 %3 = 0 ׂ %3 = 1 ӺӐӾԅʂ ӦـӡҐ²ҴҊҭ ׃ ׄ %3 = 2 %3 = 0
ӺӐӾԅʂ ؆ÅҬѮχѵҫҌѱ҈ͮѷѿѧ ؆ӏԍӯԃ ؆ӦـӡҴϟՃѻҭҊѯҍŖő
ӺӐӾԅʂ ֿ ׀ ׁ ֿ ׀ ׁ %3 = 1
%3 = 2 %3 = 0 ׂ %3 = 1 ׃ ׄ %3 = 2 %3 = 0
ӺӐӾԅʂ ׂ ֿ ׀ ׁ ֿ ׀ ׁ %3 =
1 %3 = 2 %3 = 0 ׂ %3 = 1 ׃ ׄ %3 = 2 %3 = 0
ֿ ׀ ׁ ֿ ׀ ׁ %4 = 1 %4
= 2 %4 = 3 ׂ %4 = 0 ӺӐӾԅʂ ׂ ׃ ׄ %4 = 1 %4 = 2 ӦـӡҴϟՃѻҭҊѯҍŖő ׀¦߱ѻқ҈҉ȳѯȈѩѮˠੜ
פӺӐӾԅʂץґ ࣮ΆѮ؆୯҂ѮӦـӡҐϟՃ؏আѮŖő
ӋԍӏӑӞԍӠӧӜӏӾʂ • @_LE@YJFYF[@Q،TSZLZ[FS[ @ZKLSJ@SE@SETR YFFZLZ[YLC\[FE@DKLSJYT[TDTQZITYFQLF_LSJ T[ WT[ZTS[KF"TYQE"LEF"FC،ׇׇֿׅׯ • ࣮ΆҊѹ҈ґFRD@DKFEҐҁңҐF[@R@ѮȵĚ K[[WZזזJL[K\CאDTRזזPF[@R@
• SJLSaW@DKFY@IILDFY_FYҤ࠾ˉ
ӋԍӏӑӞԍӠӧӜӏӾʂ ؆ӧӜӏӾВґɠҍåƖѻҭґѼ ؆ӧӜӏӾВҴԂԍӇ ҍѹ҈࣮Ά
ֿ ׀ ׁ ӋԍӏӑӞԍӠӧӜӏӾʂ ӦـӡӄـҐѿҮҀҮҴęѺӧӜӏӾ̌БҍࣹӨ @ZK @ZK @ZK ׯ ׯ
ׯ ӧӜӏӾ̌Б
ֿ ׀ ׁ @ZK @ZK @ZK ׯ ׯ ׯ ӧӜӏӾ̌Б
ֿ ׀ ׁ ׂ ׃ ׄ @ZK @ZK @ZK @ZK @ZK @ZK ׯ ׯ ׯ ׯ ׯ ׯ ӋԍӏӑӞԍӠӧӜӏӾʂ ӦـӡӄـҐѿҮҀҮҴęѺӧӜӏӾ̌БҍࣹӨ
ֿ @ZK ׯ ֿ ׀ ׁ @ZK @ZK @ZK ׯ
ׯ ׯ ۙѥÃҴબ ֿ ׀ ׁ ׂ ׃ ׄ @ZK @ZK @ZK @ZK @ZK @ZK ׯ ׯ ׯ ׯ ׯ ׯ ֿ˕ ҐÃҴҊҭ ؼ ӧӜӏӾ̌Б ӋԍӏӑӞԍӠӧӜӏӾʂ ӦـӡӄـҐѿҮҀҮҴęѺӧӜӏӾ̌БҍࣹӨ
ӋԍӏӑӞԍӠӧӜӏӾʂ ؆ӧӜӏӾВґɠҍåƖѻҭґѼ ؕҌҐ҉ÅҫҌѥ ؆ȳѯȈҰҭҐґӧӜӏӾ̌БҐ϶҂ѳҐґѼ ؕҌҐ҉ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ
ֿ ׀ ׁ ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ @ZK @ZK @ZK ׯ ׯ ׯ
ӧӜӏӾ̌Б ֿ ׀ ׁ ׂ ׃ ׄ @ZK @ZK @ZK @ZK @ZK @ZK ׯ ׯ ׯ ׯ ׯ ׯ
ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ ӧӜӏӾ̌Б ֿ ׀ ׁ ׂ ׃ ׄ @ZK @ZK
@ZK @ZK @ZK @ZK ׯ ׯ ׯ ׯ ׯ ׯ ֿ ׀ ׁ @ZK @ZK @ZK ׯ ׯ ׯ ׂ @ZK ׯ ׂҴϟՃ
ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ ӧӜӏӾ̌Б ֿ ׀ ׁ ׂ ׃ ׄ @ZK @ZK
@ZK @ZK @ZK @ZK ׯ ׯ ׯ ׯ ׯ ׯ ֿ ׀ ׁ @ZK @ZK @ZK ׯ ׯ ׯ ۙѥÃҴબ ׂ @ZK ׯ ȳѯȈҰ҆ҁҐґׄ҂ѳ
ӋԍӏӑӞԍӠӧӜӏӾʂ ؆ÅҫҌѥ ؆ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ
ӧӜӏӾ̌Б ֿ @ZK ׯ ˅ˤҍґ ؟ֿذ׀
˅ˤҍґ ӧӜӏӾ̌Б ֿ ׀ @ZK @ZK ׯ ׯ ׀ҴϟՃѻҭҊ ؟ֿذ׀׃־أ
ӧӜӏӾ̌Б ֿ ׀ @ZK @ZK ׯ ׯ ׁ @ZK ׯ
˅ˤҍґ ؟׀ذׁ׀׃أ ׁҴϟՃѻҭҊ
ӧӜӏӾ̌Б ֿ ׀ @ZK @ZK ׯ ׯ ׁ @ZK ׯ
ׂ @ZK ׯ ˅ˤҍґ ؟ׁذׂ׀׃أ ׂҴϟՃѻҭҊ
ӋԍӏӑӞԍӠӧӜӏӾʂ ؆ÅҫҌѥ ؆ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ
ӋԍӏӑӞԍӠӧӜӏӾʂҐ࣮Ά F[@R@ҐńĘׯ
# ϋογϡؔ32bit unsigned intͷϋογϡΛฦ͢ # CRC32, MD5ͷ্Ґ32bitͳͲͰ࣮ func hash(key string)
uint32 { ... } # ϊʔυͷϋογϡΛܭࢉ for _, node := range nodes { # ͻͱͭͷϊʔυຖʹ160ݸͷϋογϡΛܭࢉ for i := 0; i < 160; i++ { k := fmt.Sprintf(“%s-%d”, node, i) # ϊʔυ໊ͱϋογϡͷϖΞΛՃ continuum.add(node, hash(k)) } } # ϋογϡͰιʔτ͓ͯ͘͠ sort.Sort(continuum) ֿאӦـӡӶӜӯҐܭࢉ
ֿאӦـӡӶӜӯҐܭࢉ ӧӜӏӾ̌Б ֿ @ZK ׯ ֿ҅ҐӦـӡҍରѹ ΌҐӧӜӏӾҴܭࢉ ذӧӜӏӾܭࢉҍҩҭÅҬҴЕɦ ؕ׀־־¿ѱҫѥ҉ůŲׯ
# ϋογϡͰιʔτ͓͚ͯ͠ೋ୳ࡧͰ୳ࡧͰ͖Δ func search(key string) string { v := hash(key)
i, j := 0, n for i < j { h := i + (j-i)/2 if (continuum.values[i] > v) { i = h + 1 } else { j = h } } return continuum.nodes[i] } ׀אӧӜӏӾҐ୳ࡧ
׀אӧӜӏӾҐ୳ࡧ ӧӜӏӾ̌Б _ @ZK ׯ ֿ ׀ ׁ @ZK @ZK
@ZK ׯ ׯ ׯ ׂ @ZK ׯ å୳ࡧ҉˕ۙѥӧӜӏӾҴʹŲ
ҠҊң ӋԍӏӑӞԍӠӧӜӏӾʂׯ ؆ÅҫҌѥ ؕӧӜӏӾВҊѹ҈ґ׃ ¯ׁ׀CL[ׁ׀ !؆ֿ̙ ؆ϟՃѹҁҊѯҐӘӹـӐѮƀҌѥ ؆࣮ΆҤӏԍӯԃ