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PAT HELLAND AND ME HOW TO BUILD STATEFUL DISTRIBUTED APPLICATIONS THAT CAN SCALE ALMOST INFINITELY

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PAT HELLAND AND ME

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SEAN T. ALLEN VP OF ENGINEERING AT WALLAROO LABS MEMBER OF THE PONY CORE TEAM AUTHOR OF “STORM APPLIED” LOVER OF FRENCH STREET ART @SEANTALLEN @WALLAROOLABS @PONYLANG

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DATABASES APPARENTLY, I LIKE TO STICK THEM IN THINGS…

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SOME AXIOMS…

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TO SCALE INFINITELY, WE HAVE TO SCALE HORIZONTALLY

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TO SCALE INFINITELY, WE MUST AVOID COORDINATION

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DISTRIBUTED TRANSACTIONS ARE A FORM OF COORDINATION

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THEREFORE… TO SCALE INFINITELY, WE CAN’T USE TRANSACTIONS

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WELCOME TO DISTRIBUTED SYSTEMS! O, BY THE WAY, ALL THE RULES HAVE CHANGED

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WHAT IS SCALING?

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MORE AND MORE THINGS BUT, THEY DON’T GET BIGGER. THERE’S JUST… MORE OF THEM. LOTS MORE.

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WE SCALE ENTITIES ENTITIES: LIVE ON A SINGLE MACHINE AND ARE MANIPULATED INDIVIDUALLY

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WHAT IS AN ENTITY?

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ENTITIES ARE BOUNDARIES OF ATOMICITY

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Bob 6 3 5 8 Alice 4 2 7 1

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Bob 6 3 5 8 Alice 4 7 1 2

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Bob 6 3 5 8 Alice 4 2 7 1

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DENORMALIZE.. ALL THE THINGS!

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TWO LAYER ARCHITECTURE

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scale-agnostic scale-aware API

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scale-agnostic scale-aware API

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scale-agnostic scale-aware API

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scale-agnostic scale-aware API

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scale-agnostic scale-aware API

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scale-agnostic scale-aware API

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TO SCALE INFINITELY, YOUR BUSINESS LOGIC HAS TO BE INDEPENDENT OF SCALE

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WALLAROO SCALE INDEPENDENT COMPUTING FOR PYTHON

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AND IT’S NOT A DATABASE

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ENTITIES BUT WE CALL THEM… “STATE OBJECTS”

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TWO LAYER ARCHITECTURE BUT WE CALL IT… “SCALE INDEPENDENCE”

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user supplied logic Wallaroo runtime Wallaroo API

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user supplied logic Wallaroo runtime Wallaroo API

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user supplied logic Wallaroo runtime Wallaroo API

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user supplied logic Wallaroo runtime Wallaroo API

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WHAT’S HARD? ALL OF IT? YOU’RE BUILDING A DISTRIBUTED SYSTEMS *FRAMEWORK*

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CAP THEOREM CONSISTENCY VS AVAILABILITY… YOU CAN’T ESCAPE IT.

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MESSAGE DELIVERY AT-MOST-ONCE? AT-LEAST- ONCE? EFFECTIVELY-ONCE? EXACTLY-ONCE?

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MESSAGE ORDERING WILL YOU MAINTAIN THE ORDERING AS YOU RECEIVED IT?

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LOCAL KNOWLEDGE YOU HAVE TO WORK HARD TO AVOID COORDINATION.

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PROGRAMMING MODEL YOU CAN GET WITH THIS, OR YOU CAN GET WITH THAT.

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PERFORMANCE IT’S A WORD IN THE DICTIONARY

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NETWORK OVERHEAD YOU AREN’T IN LOCAL MEMORY ANYMORE

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DATA SERIALIZATION LE SIGH…

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VERIFICATION LET’S NOT GO THERE… THAT’S AN ENTIRE LECTURE SERIES.

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BTW… YOUR MULTI-CORE COMPUTER IS ALSO A DISTRIBUTED SYSTEM. BUT THAT’S A STORY FOR ANOTHER DAY.

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