Building Unbreakable Software - Speaker Deck

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NATE SMITH @nwjsmith theinternate.com

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BUILDING UNBREAKABLE SOFTWARE

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GET GOING  FAST

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$

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$

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$

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ಠ_ಠ

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FREE LUNCH

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FREE LUNCH N O PE

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$/AWESOME

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THE COMPUTER IS RELIABLE.

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THE COMPUTER IS RELIABLE. N O PE

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XEN

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175KLOC

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MULTITENANCY

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LIFETIME CONTROL

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BUILDING UNBREAKABLE SOFTWARE

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?

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BUILDING UNBREAKABLE SOFTWARE

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BUILDING UNBREAKABLE SOFTWARE

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CLIENTS

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LOAD BALANCING CLIENTS

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APP SERVERS LOAD BALANCING CLIENTS

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APP SERVERS DATABASE LOAD BALANCING CLIENTS

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APP SERVERS DATABASE LOAD BALANCING CLIENTS

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APP SERVERS DATABASE LOAD BALANCING CLIENTS

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APP SERVERS DATABASE LOAD BALANCING CLIENTS

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APP SERVERS DATABASE LOAD BALANCING CLIENTS

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APP SERVERS DATABASE LOAD BALANCING CLIENTS ಠ_ಠ

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ಠ_ಠ

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THE NETWORK IS RELIABLE.

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THE NETWORK IS RELIABLE. N O PE

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“CUSTOMERS SHOULD BE ABLE TO VIEW AND ADD ITEMS TO THEIR SHOPPING CART EVEN IF DISKS ARE FAILING, NETWORK ROUTES ARE FLAPPING, OR DATA CENTERS ARE BEING DESTROYED BY TORNADOS. THEREFORE, THE SERVICE RESPONSIBLE FOR MANAGING SHOPPING CARTS REQUIRES THAT IT CAN ALWAYS WRITE TO AND READ FROM ITS DATA STORE”

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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WRITES

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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READS

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A B E D C

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A B E D C

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A B E D C

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?

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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A B E D C

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CAP THEOREM

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CONSISTENCY AVAILABILITY PARTITION TOLERANCE

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CONSISTENCY AVAILABILITY PARTITION TOLERANCE ✔

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A B E D C

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IT’S A BUSINESS DECISION

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WE TRADED CONSISTENCY FOR AVAILABILITY

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CP

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CP

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AP CP

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AP CP

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WE CAN TRADE CONSISTENCY FOR AVAILABILITY

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WE CAN TRADE AVAILABILITY FOR CONSISTENCY

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LOCKS

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QUEUES

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LOTS OF RESEARCH

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BUILD BREAKABLE SOFTWARE

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BUILD UNBREAKABLE BUSINESSES

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?