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Riak 2.0 における全く新しい体験 スケールアウトする全文検索
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Basho Japan KK
November 11, 2014
Technology
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Riak 2.0 における全く新しい体験 スケールアウトする全文検索
DB Tech Showcase 2014 東京の発表スライド
Basho Japan KK
November 11, 2014
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Transcript
Riak 2.0ʹ͓͚Δ શ͘৽͍͠ମݧ εέʔϧΞτ͢Δશจݕࡧ Basho Japan ্ 2014/11/11
ࣗݾհ •ࢄγεςϜྺ6 •Bashoδϟύϯͷํ ͔Βདྷ·ͨ͠ •Riak CSͷ։ൃ •ͦͷଞຊͷ͜ͱ
લͷηογϣϯͰ …
෮श •Riak APͷσʔλϕʔεɺ݁Ռ߹ੑ •Riak 2.0Ͱ༷ʑͳػೳՃ •৽͍͠ݕࡧΤϯδϯͱͯ͠SolrΛόϯυϧ •͍ͨͩ͠উखRiakͦͷ··
σʔλϕʔεͷݕࡧ • DBࠐܕ • groongaͳͲ • “LIKE” • Pros •
߹ੑΛҡ͍࣋͢͠ • Cons • ີ݁߹ʹͳΔ • ֎෦࿈ܞܕ • Solr • Elasticsearch • Pros • ૄ݁߹ʹͰ͖Δ • Cons • ߹ੑΛҡ࣋͠ʹ͍͘
DBͱΠϯσοΫεͷ߹ੑ • DBͷσʔλຊମͱɺΠϯσοΫεΛ࣌ʹ҆શʹߋ ৽͢ΔͨΊʹτϥϯβΫγϣϯ͕ඞཁ • ີ݁߹ͷγεςϜͰ͋ΕϩοΫͳͲΛͬͯ߹ੑ Λอো͍͢͠
ૄ݁߹ʹ͢ΔϝϦοτ • ಉ͡ݕࡧΤϯδϯͰ͍ΖΜͳDBʹରԠͰ͖Δ • ӡ༻ϊϋπʔϧɺ։ൃΛूதͰ͖Δ • όʔδϣϯ߹ͷ੍͕؇͞ΕΔ • ยํ͕ނো͍ͯͯ͠͏ยํಈ࡞Ͱ͖Δ •
֦ு͘͢͠ͳΔ
྆ํͱ ͍͍ͱ͜ͲΓ͍ͨ͠
Yokozuna
as Riak Search 2.0 = + σʔλͷӬଓԽ Ϋϥελͷཧ γϯϓϧͳૢ࡞ RVFSZ
JOEFYJOH
Riak Search 2.0 • RiakʹSolrΛόϯυϧ • RiakͷKVΛߋ৽͢Δͱσʔλ͕ࣗಈతʹΠϯσο ΫεԽ͞ΕΔ • SolrͷϓϥάΠϯεΩʔϚɺΫΤϦΛͦͷ··
͏͜ͱ͕Ͱ͖Δ • ԽɺϊʔυՃআRiakͷ୲
ૄ݁߹ʁີ݁߹ʁ • ύοέʔδಉࠝ • ϓϩηεͱͯ͠ૄ݁߹ • ΠϯσοΫεͱσʔλؒ݁Ռ߹ੑΛอো • ΠϯσοΫεͷԽ݁Ռ߹ੑΛอো
Solrͱૄ݁߹ • Riak ϓϩηε͕ Solr ͷϓϩηεΛ fork ͢Δ • ཧɺࢹશͯRiak͕ߦ͏
• ผϓϩηεɺϝϞϦۭؒผ
εέʔϧΞτ
RingͱΠϯσοΫε • Consistent HashingΛ ͬͯΠϯσοΫεΩʔ ͱಉ༷ਫฏࢄ • Valueͱಉ͡ϊʔυʹΠϯ σοΫε͕อଘ͞ΕΔ node1
node2 node3 node4
ΠϯσοΫεԽͷྲྀΕ • Riakͷߋ৽ͱҰ৺ಉମʢdocument-based indexingʣ • ΠϯσοΫεԽʹࣦഊ͢ΔͱPUT͕ࣦഊ
ݕࡧΫΤϦͷॲཧ • Riakͷ2iMapReduceͱಉछͷΫΤϦ͕Δ • 3͓͖ͭͷ vnode ʹΞΫηε͢ΔͷͰɺॏෳͳ͍ ू
߹ੑͷ ͱҟৗܥ ߹ੑҡ࣋ͷͨΊʹߋ৽ϩάΛอ࣋ͯ͠ ϦΧόϦ͢Δͱ͍͏ํ๏ͰɺՄ༻ੑͱ அੑΛ୲อͰ͖ͳ͍ɻRiakͰଞͷ ํ๏Ͱσʔλͷ߹ੑΛҡ࣋͢Δɻ
Α͋͘Δҟৗܥ #1 •ϊʔυނোͰෳΛ3ͭ࡞Εͳ͍ •෮چͯ͠ɺ2ͭͷ··ʹͳͬͯ͠·͏
Α͋͘Δҟৗܥ #1 • ෮چͨ͋͠ͱʹRead Repair͢Δ • GETͨ͠ͱ͖ʹɺσʔλʹ͕ܽؕ͋ͬͨΒ RiakଆͰPUT͢͠ v2 v2
not found v2
Read Repair͕ ݺΕͳ͍ͱ σʔλ͕Βͳ͍ʁ YES
ΫϥΠΞϯτ͔Β GET͕ݺΕͳ͍ͱ σʔλ͕Βͳ͍ʁ NO
AAE (Active Anti Entropy) https://www.flickr.com/photos/51pct/7507525118/
Active Anti Entropy • APࢦͷDBͷσʔλྼԽΛ͙ ͨΊͷόοΫάϥϯυॲཧ • Merkle-TreeΛͬͯύʔςΟγϣ ϯຖͷʮνΣοΫαϜʯΛܭࢉ •
ࠩΛݟ͚ͭͨΒͦ͜ΛRead Repair͢Δ hash(vnode=0, pid=0) hash(vnode=1, pid=0) hash(vnode=2, pid=0)
Α͋͘Δҟৗܥ #2 • Solr͕ΠϯσοΫεԽ͢Δલʹམͪͨ • Key, Valueอଘ͞Ε͕ͨΠϯσοΫεͳ͍
Read Repair͕ ݺΕΕΠϯσο Ϋε͕म෮͞ΕΔʁ NO
AAE (Active Anti Entropy) https://www.flickr.com/photos/51pct/7507525118/
YZ Active Anti Entropy • ݕࡧΠϯσοΫεʹ͍ͭͯ Merkle TreeΛ࡞ • ύʔςΟγϣϯຖʹKey-Valueͷ
Treeͱൺֱ͠ɺ͕ࠩ͋ΕΠϯ σοΫεΛमਖ਼ hash(vnode=0, pid=0, kv) hash(vnode=0, pid=0, yz)
Α͋͘Δҟৗܥ #2 •Searchઐ༻AAE͕ಈ࡞͍ͯ͠Δ •ΠϯσοΫεͱσʔλͷෆ߹Λݟ͚ͭͯ म෮͢Δ AAE
Α͋͘Δҟৗܥ #3 • ωοτϫʔΫ͕Ε͍ͯͨͱ͖ʹ྆ଆͰߋ৽͕ى ͖ͨʢSplit Brainʣ • Hinted HandoffʹΑΓͲͪΒॻ͖ࠐΈޭ
Α͋͘Δҟৗܥ #3 • ෮چ࣌ʹHandoffͰฦ͞Εɺ྆ํͷΛอ࣋ • GET·ͨAAEʹΑͬͯRead Repair͞ΕΔ
ҟৗܥ #1, #2, #3 •Ͳͷҟৗɺಛʹۓٸͷରॲඞཁͳ͍ •߹ੑݕࠪͱम෮͕ࣗಈͰߦΘΕΔ •ϧʔνϯϫʔΫͷӡ༻࡞ۀ͕΄ͱΜͲͳ͍
·ͱΊ • σʔλϕʔεͱશจݕࡧͷ • ߹ੑΛͱΔ͔ɺૄ݁߹ΛͱΔ͔ͷ • ৽͍͠Riak Search 2.0 •
ਫฏࢄͯ͠εέʔϧΞτͰ͖Δݕࡧ • ݁Ռ߹ੑΛબͿ͜ͱʹΑΓૄ݁߹ԽͱࢄԽ ʹޭʢ͔͠APܕʹʂʣ • ݁Ռ߹ੑΛબͨ͠ઃܭʹΑΓӡ༻͕؆୯ʹ
Questions?
FAQ •ΦϯϥΠϯͷεΩʔϚมߋʁ •μΠφϛοΫεΩʔϚʁ
outline • σʔλϕʔεʹೖ͍ͬͯΔσʔλΛશจݕࡧ͍ͨ͠→ࢁͷΠϯσοΫε͕Ͱ͖ΔɺFKeyͰ ΠϯσοΫε…ͱ͍͏͚ͩͰ • શจݕࡧΤϯδϯͷछྨ • ֎෦ܕʢ߹ੑΛҡ࣋͠ʹ͍͕͘Ԡ༻͕ޮ͘ɺރΕͨιϑτΣΞϓϥάΠϯ͕ଟ͍ʣ • ΈࠐΈܕʢ߹ੑΛҡ͍͕࣋͢͠ɺϝϯςφϯε͕͍͠ʣ
• Riakͦͷதؒɹόϯυϧͯ͠ΔͷͰָɺ͚ͩͲ࣮ମSolrɺ߹ੑΛࣗಈతʹҡ࣋͢Δ • όϯυϧͷํ๏ɺ߹ੑɺࢄͷํ๏ • ݕࡧΠϯσοΫε͚ͩΛࢄͤ͞Δͷ͍͠ • DBͱΠϯσοΫεͷ߹ɺϨϓϦΧͱϨϓϦΧͷ߹ɺJepsenͷͳ͠