Rustでon-diskなB+Treeを作ったときの細かな話

Rust LT Online #3 で発表したスライドです
https://rust.connpass.com/event/209279/

Transcript

1. KOBA789
   RustͰ
   on-diskͳB+TreeΛ
   

   ࡞ͬͨͱ͖ͷ
   ࡉ͔ͳ࿩
   

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2. KOBA789
   ݱࡏਐߦܗͰແ৬
   ‣ 3VTUྺ͸೥͘Β͍
   ‣ ී௨ʹ΢ΣϒαʔόʔΛॻ͍ͨΓ
   ‣ %#.4Λॻ͍ͨΓ
   ‣ ϒϥ΢βͰಈ͘ճ࿏$"%Λॻ͍ͨΓ
   

   8"4.λʔήοτ
   
   ‣ ࣗ࡞ΩʔϘʔυͷ
   

   ϑΝʔϜ΢ΣΞΛॻ͍ͨΓ
   

   ͍ΘΏΔ૊ΈࠐΈ3VTU
   
   ͓͢͢Ίͷ࢓ࣄʹؔ͢Δ৘ใ͸
   

   ͍ͭͰ΋׻ܴ͍ͯ͠·͢
   https://gihyo.jp/magazine/wdpress/archive/2021/vol122
   ʲະঝ୚޿ࠂʳࡶࢽʹهࣄॻ͖·ͨ͠
   

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3. RustͰ
   on-diskͳB+TreeΛ
   

   ࡞ͬͨͱ͖ͷ
   ࡉ͔ͳ࿩
   ࠓճͷλΠτϧ
   

   ʢ࠶ܝʣ
   

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4. RustͰ
   on-diskͳB+TreeΛ
   

   ࡞ͬͨͱ͖ͷ
   ࡉ͔ͳ࿩
   ͱ͸ʁ
   

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5. RustͰ
   on-diskͳB+TreeΛ
   

   ࡞ͬͨͱ͖ͷ
   ࡉ͔ͳ࿩
   ͱ͸ʁ
   " ಺༰ΛσΟεΫʹӬଓԽͰ͖ͨΓɺ
   

   ϝϞϦΑΓେ͖ͳ಺༰ΛσΟεΫ্Ͱѻ͑ͨΓ͢Δ
   

   #5SFF
   ˞ಠࣗͷఆٛͰ͢
   

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6. ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ ϊʔυ ϊʔυ
   ϊʔυ
   ͜͏͍͏#5SFFΛߟ͑Δ
   

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7. ϊʔυ
   ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ͱΓ͋͑ͣ࣍ݩʹͭͿ͢
   

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8. σΟεΫʢϑΝΠϧʣ
   ϊʔυ
   ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   σΟεΫ͕͋Δͱ͢Δ
   

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9. σΟεΫʢϑΝΠϧʣ
   ϊʔυ
   ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   ϊʔυ ϊʔυ
   σΟεΫʹೖͬͨ
   

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10. σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    CPU
    #5SFFΛૢ࡞͍ͨ͠
    

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11. σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    CPU
    #5SFFΛૢ࡞͍ͨ͠
    σΟεΫΛ௚઀ಡΈॻ͖͢Δͷ͸஗͍͠ෆศ
    

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12. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    CPU
    ϝϞϦʹόοϑΝΛ༻ҙ
    

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13. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    

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14. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    ϊʔυͷҰ෦ΛϝϞϦ΁
    

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15. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    ಡΈॻ͖
    ೖΕସ͑
    όοϑΝϓʔϧϚωʔδϟ
    

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16. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    Ұ෦ͷϊʔυͷΈ͕ϝϞϦʹ͋Δ#5SFFͱ͍͑Δ
    ന͍ϊʔυ͸σΟεΫʹ͔͠ͳ͍
    

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17. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    ಡΈॻ͖
    ೖΕସ͑
    ͱ͜ΖͰɺ
    

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18. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    ಡΈॻ͖
    ೖΕସ͑
    ϚϧνίΞΛ׆༻͍ͨ͠Ͱ͢ΑͶʁ
    CPU CPU CPU
    

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19. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    ར༻தͷϊʔυΛόοϑΝ͔Β௥͍ग़ͨ͠Γ͢Δͱ͍ͨ΁Μͳ͜ͱʹ
    CPU CPU CPU
    ΛಡΈ͍ͨɻΛ௥͍ग़ͦ͏
    ଴ͯίϥ
    ϊʔυ
    ར༻த
    

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20. ϝϞϦ
    σΟεΫʢϑΝΠϧʣ
    ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ
    CPU
    ར༻தͷϊʔυΛόοϑΝ͔Β௥͍ग़ͨ͠Γ͢Δͱ͍ͨ΁Μͳ͜ͱʹ
    CPU CPU CPU
    ΛಡΈ͍ͨɻΛ௥͍ग़ͦ͏
    ଴ͯίϥ
    ϊʔυ
    ར༻த
    ͜ͷ΁Μͷ
    

    σʔλߏ଄ɾΞϧΰϦζϜΛ
    

    3VTUͰͲ͏͢Δ͔
    POEJTLಛ༗ͷ೉͕͋͠͞Δ
    

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21. 3VTUͰPOEJTLͳ#5SFFΛ࡞Δͱ͖ͷݒ೦ࣄ߲
    w όοϑΝϓʔϧϚωʔδϟͷ
    

    σʔλߏ଄ͱΞϧΰϦζϜ
    w #5SFFͷϊʔυͷσʔλߏ଄
    w #5SFFͷഉଞ੍ޚ
    

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22. όοϑΝϓʔϧϚωʔδϟͷ
    

    σʔλߏ଄ͱΞϧΰϦζϜ
    

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23. ར༻தͷϊʔυΛอޢ͢Δʹ͸
    $.6ͷߨٛͰ࢖ΘΕ͍ͯΔ#VT5VC $
    ͱ͍͏࣮૷ͷ৔߹
    ϊʔυʢϖʔδʣ಺ʹΧ΢ϯλΛ
    

    ࣋ͬͯ؅ཧ͍ͯ͠Δ
    https://github.com/cmu-db/bustub/blob/master/src/include/storage/page/page.h
    ϐϯ 1JO
    ͸ʮར༻தʯͷҙຯ
    ˞3VTUͷ1JOͱ͸ؔ܎ͳ͍
    

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24. 3VTUͰ͸Ͳ͏͢Δ͔
    Ҋ$ಉ༷ʹΧ΢ϯλͰอޢ
    w ڞ༗ϝϞϦΛॻ͖׵͑ΔͨΊɺ
    

    ౰વͷΑ͏ʹVOTBGF͕ొ৔
    w ઈରʹόάΒͤΔࣗ৴͔͠ͳ͍
    w ͜ΕͳΒ$Ͱॻ͚͹͍͍
    w ଈߦͰϘπ
    

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25. 3VTUͰ͸Ͳ͏͢Δ͔
    Ҋ3X-PDLͰอޢ
    w ར༻த͸4IBSFEMPDLΛ͓࣋ͬͯ͘
    w ௥͍ग़ͨ͘͠ͳͬͨΒ&YDMVTJWFMPDLΛऔΔ
    w (VBSEܥͷߏ଄ମ͸TUBUJD͡Όͳ͍ͷͰ
    

    औΓճ͕͠ѱ͍
    

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26. 3VTUͰ͸Ͳ͏͢Δ͔
    Ҋ"SDͰอޢ
    w "SDʹ͸HFU@NVU NVU"SD5
    ͱ͍͏
    

    ϝιου͕͋Δ
    w ࢀরΧ΢ϯλ͕ͷͱ͖ʹ͚ͩNVU5͕औΕΔ
    w όοϑΝϓʔϧͷʮϐϯʯͱ૬ੑ͕Αͦ͞͏ͳػೳ
    w ͨͩ͠Ϩγʔό͸NVU
    w όοϑΝϓʔϧશମΛอޢ͢Δ.VUFY͕͋ΔͷͰ
    

    Մมࢀর͕औΕΔ
    

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27. #5SFFͷϊʔυͷ
    

    σʔλߏ଄
    

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28. #5SFFͷϊʔυͷߏ଄
    ૉ๿ʹ΍Δͱɺ͜͏
    

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29. ⚠ϊʔυ͸σΟεΫʹ
    

    ॻ͖ग़ͤͳ͚Ε͹ͳΒͳ͍
    ΋ͪΖΜɺಡΈग़͠΋Ͱ͖ͳ͚Ε͹ͳΒͳ͍
    

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30. 2ߏ଄ମΛσΟεΫʹ
    

    ॻ͖ग़͍ͨ͠ͱ͖ɺͲ͏͢Δʁ
    

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31. 2ߏ଄ମΛσΟεΫʹ
    

    ॻ͖ग़͍ͨ͠ͱ͖ɺͲ͏͢Δʁ
    TFSEF
    

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32. 2ߏ଄ମΛσΟεΫʹ
    

    ॻ͖ग़͍ͨ͠ͱ͖ɺͲ͏͢Δʁ
    TFSEF
    γϦΞϥΠζޙͷσʔλ௕͕Θ͔Βͳ͍͠
    ޮ཰΋ѱ͍ͷͰμϝ
    

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33. 2ߏ଄ମΛσΟεΫʹ
    

    ॻ͖ग़͍ͨ͠ͱ͖ɺͲ͏͢Δʁ
    "ͦͷ··ॻ͖ग़ͤΔ
    

    σʔλߏ଄Λ͕Μ͹࣮ͬͯ૷͢Δ
    

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34. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ϊʔυ
    ͖ͬ͞ొ৔ͨ͠ϊʔυ͘Μ
    

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35. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ࣮͸͜͏͍͏େ͖͞
    

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36. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ,FZ 7BMVF
    ͜Ε͸,FZ7BMVFͷϖΞ
    

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37. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ,FZ 7BMVF
    ,FZ 7BMVF
    ,FZ 7BMVF
    ௕͞͸όϥόϥ
    

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38. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    ͜ΕΛͦͷ··ෑ͖٧ΊΔͱ
    

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39. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    Φϑηοτ͕౳ִؒͰ͸ͳ͍ͷͰೋ෼୳ࡧͰ͖ͳ͍
    

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40. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ,FZ 7BMVF
    ,FZ 7BMVF
    ,FZ 7BMVF
    ࢓੾Γ௚͠
    

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41. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    ,FZ7BMVF͸ޙΖʹ٧Ίͯ
    

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42. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    ݻఆ௕ͷϙΠϯλΛ಄ʹฒ΂Δ
    

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43. ͦͷ··ॻ͖ग़ͤΔσʔλߏ଄
    ৗʹݻఆ௕ͷόΠτྻͷΈʹऩ·Δσʔλߏ଄
    ,#
    1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    ͜ΕΛ3VTUͰॻ͘
    

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44. ͱ͜ΖͰ͜ΕΛͲ͏΍ͬͯ
    

    Ωϟετ͢Δͷ͔
    

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45. std::mem::transmute
    

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46. std::mem::transmute
    ͦΜͳةݥͳ΋ͷ࢖͏Θ͚ͳ͍
    

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47. ศརDSBUFl[FSPDPQZz
    ΞϥΠϝϯτͳͲΛߟྀͯ҆͠શʹܕΩϟετͰ͖Δ
    w (PPHMFͷ'VDITJBͰ࢖ΘΕ͍ͯΔͬΆ͍
    w ࢖͍ํʹ͔ͳΓΫη͕͋Δ
    w υΩϡϝϯτ͸ۃΊͯগͳ͍
    w αϯϓϧίʔυ͸'VDITJBͷωοτϫʔΫελοΫ
    

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48. LayoutVerifiedͱ͍͏
    

    εϚʔτϙΠϯλܦ༝Ͱૢ࡞͢Δ
    new_from_prefixϝιου͸
    

    ϔομͱϘσΟʹ෼͔Ε͍ͯΔ
    

    σʔλߏ଄ʹ࢖͑Δ
    

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49. 1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    OVN@TMPUT
    IFBEFS CPEZ
    

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50. new_sliceϝιουͰ
    

    ϙΠϯλͷεϥΠεΛ੾Γग़͍ͯ͠Δ
    

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51. 1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    OVN@TMPUT
    QPJOUFST
    IFBEFS CPEZ
    

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52. 1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    OVN@TMPUT
    QPJOUFST
    IFBEFS CPEZ
    ͜ͷਤΛΑ͘ݟͯ΄͍͠
    

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53. 1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    OVN@TMPUT
    QPJOUFST
    IFBEFS CPEZ
    QPJOUFST͸CPEZΛआ༻͍ͯ͠Δ
    

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54. 1US ,FZ 7BMVF ,FZ 7BMVF ,FZ 7BMVF
    1US 1US
    OVN@TMPUT
    QPJOUFST
    IFBEFS CPEZ
    QPJOUFST͸CPEZΛआ༻͍ͯ͠Δ
    ͭ·Γɺ,FZ7BMVFϖΞΛมߋ͢Δͱ͖ʹ͸
    

    ͍͍ͪͪQPJOUFSTΛख์͞ͳ͚Ε͹ͳΒͳ͍
    ͩΔ͍
    

    ʢ͔ͨ͠ͳ͠ʣ
    

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55. #5SFFͷഉଞ੍ޚ
    

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56. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    CPU CPU
    

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57. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    CPU CPU
    Modify
    Modify
    💥
    😩
    😩
    

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58. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    CPU CPU
    ϩοΫ͸্͔ΒॱʹऔΔ
    

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59. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    ϩοΫ͸্͔ΒॱʹऔΔ
    CPU CPU
    

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60. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    ϩοΫ͸্͔ΒॱʹऔΔ
    CPU CPU
    

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61. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    ϩοΫ͕औΕͨΒɺ্ͷϩοΫ͸ख์ͯ͠΋Α͍
    CPU CPU
    

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62. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    ଞͷεϨου͕ಈ͚ͯฒྻ౓্͕͕Δ
    CPU CPU
    

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63. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ ϊʔυ ϊʔυ
    ϊʔυ
    CPU CPU
    ಉ༷ʹଓ͚Δ
    

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64. ϊʔυ
    ϊʔυ ϊʔυ
    ϊʔυ ϊʔυ
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