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Java Ͱ࠷଎ͷ ϋογϡΞϧΰϦζϜΛٻΊͯ 2015-08-10 JJUG Night seminar @komiya_atsushi

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͓·ͩΕ ʢ͓લ୭Αʁʣ

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KOMIYA Atsushi @komiya_atsushi

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No content

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bit.ly/WeLoveSmartNews

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ຊ೔ͷτϐοΫ: ϋογϡΞϧΰϦζϜ (ؔ਺)

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ϋογϡؔ਺ʁ

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ϋογϡؔ਺ʁ ͋ͬɺ͜ΕਐݚθϛͰ+%,ͷ ιʔεͰΈͨ΍ͭͩʂʂ

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ϋογϡؔ਺ʁ KBWBVUJM)BTI.BQ Λ࢖͏ͱ͖ʹ͓ੈ࿩ʹ ͳͬͯΔΞϨͰ͢

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ϋογϡؔ਺ͷར༻༻్ • ΞϧΰϦζϜ / σʔλߏ଄ • ϋογϡςʔϒϧ • ϒϧʔϜϑΟϧλ • Count-Min sketch • ػցֶश • Locality sensitive hashing • Feature hashing • ηΩϡϦςΟ • ϝοηʔδμΠδΣετ / ϝοηʔδೝূූ߸

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ϋογϡؔ਺ͷར༻༻్ • ΞϧΰϦζϜ / σʔλߏ଄ • ϋογϡςʔϒϧ • ϒϧʔϜϑΟϧλ • Count-Min sketch • ػցֶश • Locality sensitive hashing • Feature hashing • ηΩϡϦςΟ • ϝοηʔδμΠδΣετ / ϝοηʔδೝূූ߸ )BTI.BQҎ֎Ͱ΋ සൟʹ͓ੈ࿩ʹͳͬͯ·͢

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ϋογϡΞϧΰϦζϜʹٻΊΔػೳɾੑೳ • ػೳ • Մม௕ͷ௕͞ͷσʔλʹରͯ͠ɺϋογϡ஋ΛܭࢉͰ͖Δ • γʔυΛ༩͑Δ͜ͱͰɺϋογϡؔ਺ͷόϦΤʔγϣϯΛ࡞ Δ͜ͱ͕Ͱ͖Δ • ಉ͡ϋογϡΞϧΰϦζϜʹಉ͡σʔλΛ༩͑ͯ΋ɺ
 γʔυ͕ҟͳΔͳΒ͹ϋογϡ஋΋ҟͳΔ • ੑೳ • ଎͍ • িಥ͠ʹ͍͘

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ϋογϡΞϧΰϦζϜʹٻΊΔػೳɾੑೳ • ػೳ • Մม௕ͷ௕͞ͷσʔλʹରͯ͠ɺϋογϡ஋ΛܭࢉͰ͖Δ • γʔυΛ༩͑Δ͜ͱͰɺϋογϡؔ਺ͷόϦΤʔγϣϯΛ࡞ Δ͜ͱ͕Ͱ͖Δ • ಉ͡ϋογϡΞϧΰϦζϜʹಉ͡σʔλΛ༩͑ͯ΋ɺ
 γʔυ͕ҟͳΔͳΒ͹ϋογϡ஋΋ҟͳΔ • ੑೳ • ଎͍ • িಥ͠ʹ͍͘ ଎͍ʹਖ਼ٛ

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※҉߸ֶతϋογϡؔ਺ • ϝοηʔδμΠδΣετ΍ϝοηʔδೝূූ ߸ͷੜ੒ʹར༻Ͱ͖Δϋογϡؔ਺ • ී௨ͷϋογϡؔ਺ͷಛੑʹՃ͑ɺڧিಥ ଱ੑ΍ऑিಥ଱ੑͳͲͷಛੑΛ΋ͭඞཁ͕ ͋Δ • ྫɿMD5 ΍ SHA-xx γϦʔζͳͲ

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※҉߸ֶతϋογϡؔ਺ • ϝοηʔδμΠδΣετ΍ϝοηʔδೝূූ ߸ͷੜ੒ʹར༻Ͱ͖Δϋογϡؔ਺ • ී௨ͷϋογϡؔ਺ͷಛੑʹՃ͑ɺڧিಥ ଱ੑ΍ऑিಥ଱ੑͳͲͷಛੑΛ΋ͭඞཁ͕ ͋Δ • ྫɿMD5 ΍ SHA-xx γϦʔζͳͲ ҉߸ֶతϋογϡؔ਺͸ ຊ೔͸औΓѻ͍·ͤΜ ʢ஗͍ͷͰʣ

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ຊ೔औΓ্͛Δ ϋογϡΞϧΰϦζϜ

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5BCMFGSPNIUUQTHJUIVCDPN$ZBOYY)BTI

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5BCMFGSPNIUUQTHJUIVCDPN$ZBOYY)BTI 2VBMJUZ͕े෼ͳ ͜ͷͭΛऔΓ্͛·͢

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MurmurHash series • 2008 ೥ʙ • ༷ʑͳϓϩμΫτͰ৭ʑͳ༻్Ͱ࢖ΘΕ͍ͯΔ • Nginx, Hadoop, Cassandra, Solr… • from https://en.wikipedia.org/wiki/ MurmurHash#Implementations • Current version: MurmurHash3 • ࠷େ 128 bit ͷϋογϡ஋Λܭࢉ͢Δ͜ͱ͕Ͱ͖Δ

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CityHash • 2011 ೥ʙ • Google ۘ੡ͷϋογϡΞϧΰϦζϜ • http://google-opensource.blogspot.jp/2011/04/introducing- cityhash.html • “inspired by (தུ) MurmurHash” • ࠷େ 128 bit ͷϋογϡ஋Λܭࢉ͢Δ͜ͱ͕Ͱ͖Δ • ϦϦʔεϊʔτʹ͸ʮMurmurHash3 ΑΓ଎͍ʯతͳ͜ͱ͕ॻ͔Ε͍ͯΔ ͕… • https://code.google.com/p/cityhash/source/browse/trunk/README

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xxHash • 2012 ೥ʙ • Extremely fast ͳѹॖΞϧΰϦζϜ LZ4 Λ։ൃ͍ͯ͠Δํ (Yann Collet @ Facebook Paris) ͷɺ͜Ε·ͨ extremely fast ͳϋογϡΞϧΰϦζϜ • C ࣮૷Ͱ͸ MurmurHash3 ͦͷଞΛ཈͑ͯ #1 ͷ଎౓Β͍͠ • ࠷େ 64 bit ͷϋογϡ஋Λܭࢉ͢Δ͜ͱ͕Ͱ͖Δ • ར༻࣮੷͸·ͩଟ͘ͳ͛͞ • Presto ͷϋογϡΞϧΰϦζϜ͕ MurmurHash3 ͔Β xxHash ʹࠩ͠ ସ͑ΒΕΔͳͲɺ࠾༻͸ঃʑʹ޿͕͖͍ͬͯͯΔʁ • https://github.com/facebook/presto/commit/ 87cb4f2ba8a57a3edb6e4d5a89658b6a3191b3e7

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֤छϋογϡΞϧΰϦζϜͷ Java ࣮૷

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Java ͰͷϋογϡΞϧΰϦζϜ࣮૷ • ࠷ۙͷϋογϡΞϧΰϦζϜ͸ CPU ͷ໋ྩΛҙࣝͯ͠ઃܭ͞Εͨ΋ͷ ͕ଟ͍ • JVM ্Ͱಈ͘ Java ͸ɺͦͷઃܭͷԸܙΛड͚ΒΕΔͱ͸ݶΒͳ͍ • ಉ͡ϋογϡΞϧΰϦζϜͰ΋ɺ࣮૷ํ๏ʹΑͬͯ଎౓͕ࠩੜ͡Δ • Pure Java ࣮૷ • sun.misc.Unsafe ࣮૷ • Private API ͱ͸ͳΜͩͬͨͷ͔… • JNI ܦ༝ͷ native ࣮૷

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Guava • ‘com.google.guava:guava:18.0’ • Google Core Libraries for Java • ศརͳػೳ͕͍Ζ͍Ζೖ͍ͬͯΔ • ϋογϡΞϧΰϦζϜͷ࣮૷͸ MurmurHash3 ͷΈ • ೖྗɾग़ྗΠϯλϑΣʔεͱ΋ʹॆ࣮͍ͯ͠Δ

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Zero-allocation hashing (OpenHFT) • ‘net.openhft:zero-­‐allocation-­‐hashing:0.3’ • HFT (ߴස౓औҾ) ͳձࣾʁͷϓϩμΫτ • ϋογϡΞϧΰϦζϜͷ࣮૷ʹಛԽ • MurmurHash3, CityHash, xxHash ͷ࣮૷͕ఏڙ͞Ε͍ͯΔ • Google guava ͱಉ͡Α͏ʹΠϯλϑΣʔε͕ͦͦ͜͜ॆ࣮͠ ͍ͯΔ • sun.misc.Unsafe API Λར༻͍ͯ͠Δ

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lz4-java • ‘net.jpountz.lz4:lz4:1.3.0’ • LZ4 ͷ Java ϙʔςΟϯά • ͚ͩͲɺ΋Εͳ͘ xxHash ͷ Java ࣮૷΋
 ͍ͭͯ͘Δ • Pure Java / sun.misc.Unsafe / Native Ͱͷ
 ֤࣮૷Λఏڙ͍ͯ͠Δ

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ೖྗΠϯλϑΣʔεͷൺֱ (VBWB 0QFO)'5 M[KBWB CZUF<> ̋ ̋ ̋ #ZUF#V⒎FS ̋ 4USJOH ̋ ̋ MPOH ̋ ̋ JOU ̋ ̋ 4USFBNJOH ̋ ̋ CZUF<> PUIFST 0CKFDU 0UIFSQSJNJUJWFT BSSBZ

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ೖྗΠϯλϑΣʔεͷൺֱ (VBWB 0QFO)'5 M[KBWB CZUF<> ̋ ̋ ̋ #ZUF#V⒎FS ̋ 4USJOH ̋ ̋ MPOH ̋ ̋ JOU ̋ ̋ 4USFBNJOH ̋ ̋ CZUF<> PUIFST 0CKFDU 0UIFSQSJNJUJWFT BSSBZ ೖྗ*'ͷ๛෋͞͸ ;FSPBMMPDBUJPO IBTIJOH͕ѹ౗త

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ೖྗΠϯλϑΣʔεͷൺֱ (VBWB 0QFO)'5 M[KBWB CZUF<> ̋ ̋ ̋ #ZUF#V⒎FS ̋ 4USJOH ̋ ̋ MPOH ̋ ̋ JOU ̋ ̋ 4USFBNJOH ̋ ̋ CZUF<> PUIFST 0CKFDU 0UIFSQSJNJUJWFT BSSBZ

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ग़ྗΠϯλϑΣʔεͷൺֱ (VBWB 0QFO)'5 M[KBWB CZUF<> ̋ MPOH ̋ ̋ ̋ JOU ̋ 4USJOH ̋

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ग़ྗΠϯλϑΣʔεͷൺֱ (VBWB 0QFO)'5 M[KBWB CZUF<> ̋ MPOH ̋ ̋ ̋ JOU ̋ 4USJOH ̋ ग़ྗ*'͸ (VBWB͕ ༏Ε͍ͯΔ

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ϕϯνϚʔΫ

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ೖྗσʔλ • byte ഑ྻ • 8 byte, 1024 byte, 64K byte ͷ 3 ύλʔϯ • long (ϓϦϛςΟϒ) • String • 64K จࣈ

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ϋογϡΞϧΰϦζϜ • ͍ͣΕͷϋογϡΞϧΰϦζϜ΋γʔυ͸ݻఆ • MurmurHash • 128 bit ൛Λར༻ • CityHash • 64 bit ൛Λར༻ • xxHash • 64 bit ൛Λར༻

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bit.ly/jjug-2015-hash-bench

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ϕϯνϚʔΫ݁Ռ (byte array)

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Byte array (8 bytes)

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Byte array (8 bytes) /BUJWF͸Φʔόʔϔουେ͖Ί ͳͷ͔ɺ୹͍σʔλΛͨ͘͞Μ ॲཧ͢Δͷ͕ۤखͬΆ͍

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Byte array (8 bytes)

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Byte array (1024 bytes)

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Byte array (64K bytes)

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Byte array (64K bytes) 6OTBGF͸଎͍

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Byte array (64K bytes) /BUJWF΋େ͖͍σʔλʹରͯ͠͸଎͍

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Byte array (64K bytes) YY)BTI$JUZ)BTI .VSNVS)BTI

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ϕϯνϚʔΫ݁Ռ (primitive long)

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Primitive long

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ϕϯνϚʔΫ݁Ռ (string)

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String

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·ͱΊ

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ࠓ೔͸͜Ε͚֮ͩ͑ͯؼ͍ͬͯͩ͘͞ • 2015೥8݄࣌఺Ͱ࠷଎ͷϋογϡΞϧΰϦζϜ • xxHash • 2015೥8݄࣌఺Ͱ࠷଎ͷ Java ࣮૷ • OpenHFT ͷ Zero-allocation hashing

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࣮ࡍ͸έʔεόΠέʔε • 128 bit ͷϋογϡ஋͕ཉ͍͠ • Guava • 64 bit Ͱ͍͍ͷͰɺ࠷଎ͷ MurmurHash ͕ཉ͍͠ • Zero-allocation hashing • ετϦʔϜతʹϋογϡ஋Λܭࢉ͍ͨ͠ • lz4-java or Guava

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ࠔͬͨΒͱΓ͋͑ͣɺ xxHash Zero-allocation hashing

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Thank you & Happy hashing!!

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