The Rise of Reactive Microservices

WeAreDevelopers — Berlin

Transcript

1. WeAreDevelopers 2022 — Berlin
   @duffleit
   

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2. David Leitner
   @duffleit
   Coding Architect
   david@squer.at
   @duffleit
   

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3. @duffleit
   Somewhen in 2011.
   

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4. @duffleit
   User
   <μService>
   Account
   <μService>
   Legder
   <μService>
   WebBanking
   New Payment
   💸
   Perform Payment
   € 20, 00
   👧
   Lisa
   to
   David
   from
   transferMoney
   triggerPayment
   createTransactions
   

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5. @duffleit
   User
   <μService>
   Account
   <μService>
   Legder
   <μService>
   WebBanking
   Your payment was
   successfully executed.
   transferMoney
   triggerPayment
   createTransactions
   ✅
   

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6. @duffleit
   User
   <μService>
   Account
   <μService>
   Legder
   <μService>
   WebBanking
   New Payment
   💸
   Perform Payment
   € 20, 00
   👧
   Lisa
   to
   David
   from
   transferMoney
   triggerPayment
   createTransactions <μService>
   Legder
   Legder
   <μService>
   

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7. @duffleit
   User
   <μService>
   Account
   <μService>
   Legder
   <μService>
   WebBanking
   Your payment was
   successfully executed.
   transferMoney
   triggerPayment
   createTransactions
   ✅
   Retries
   Timeouts
   Circuit Breakers
   Synchronise
   

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8. First Generation of MicroServices
   Synchronously Integrated
   @duffleit
   

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9. @duffleit
   User
   <μService>
   Account
   <μService>
   WebBanking
   transferMoney
   triggerPayment
   New Payment
   💸
   € 20, 00
   👧
   Lisa
   to
   David
   from
   Perform Payment
   <μService>
   Legder
   

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10. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    <μService>
    Legder
    

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11. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Queue
    <μService>
    Legder
    

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12. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Queue
    <μService>
    Legder
    

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13. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Queue
    <μService>
    Legder
    

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14. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Queue
    <μService>
    Legder
    

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15. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Queue
    <μService>
    Legder
    

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16. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions Queue
    <μService>
    Legder
    Your payment was
    accepted.
    ✅
    

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17. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions Queue
    <μService>
    Legder
    Your payment was
    accepted.
    ✅
    Legder
    <μService>
    

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18. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions Queue
    <μService>
    Legder
    Your payment was
    accepted.
    ✅
    Legder
    <μService>
    

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19. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions Queue
    <μService>
    Legder
    Your payment was
    accepted.
    ✅
    Legder
    <μService>
    Queue
    

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20. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions Queue
    <μService>
    Legder
    Your payment was
    accepted.
    ✅
    Legder
    <μService>
    Queue
    Queue
    

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21. Second Generation of MicroServices
    Message-Driven and Asynchronously
    Integrated
    @duffleit
    

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22. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Queue
    Queue
    Queue
    

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23. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Queue
    Queue
    Queue
    As a Customer, I want my
    transaction to be booked
    by the ledger.
    

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24. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Queue
    Queue
    Queue
    As a Customer, I want the
    account service to update
    my balance.
    

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25. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    transferMoney
    triggerPayment
    createTransactions
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Queue
    Queue
    Queue
    As a Customer, I want
    to transfer money to
    someone else.
    

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26. The Entity Service
    Antipattern.
    @duffleit
    

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27. Let's create Services along
    Customer Journeys.
    @duffleit
    

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28. @duffleit
    “ On the Criteria To Be Used in
    Decomposing Systems into Modules
    — Parnas, 1972
    

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29. Let's create Services along
    Customer Journeys.
    @duffleit
    

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30. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Payments
    <μService>
    Domain Services
    Journey Services
    As a Customer, I want
    to transfer money to
    someone else.
    

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31. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Web-BFF
    <μService>
    Domain Services
    Backend For Frontends
    As a Customer, I want
    to transfer money to
    someone else.
    Mobile-BFF
    <μService>
    Mobile Banking
    € 20, 00
    Pay
    Payment Flow
    Payment Flow
    

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32. @duffleit
    No Domain Logic in
    Backend For Frontends.
    It's about Ui-Specific Aggregation, to get rid
    of over-fetching and over-requesting.
    

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33. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Payments
    <μService>
    Domain Services
    Journey Services
    

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34. @duffleit
    User
    <μService>
    Account
    <μService>
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Legder
    <μService>
    Payments
    <μService>
    Domain Services
    Journey Services
    Balance
    <μService>
    

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35. @duffleit
    ⚡
    Customer Journey & Entity Data
    Mismatch Problem
    

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36. @duffleit
    Users Accounts Transactions
    Entities
    Customer Journeys
    Payments
    Onboarding
    Fraud Detection
    ⚡
    

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37. @duffleit
    User Account
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Transactions
    Payments
    Domain Services
    Journey Services
    Onboarding Fraud Detection
    User Account
    Account Transactions
    

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38. @duffleit
    User Account
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Transactions
    Payments
    Domain Services
    Journey Services
    Onboarding Fraud Detection
    User Account
    Account Transactions
    ⚡
    ⚡ ⚡
    

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39. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User Account
    Account Transactions
    User
    Account
    Transactions
    Service Autnomy
    

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40. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User Account
    Account Transactions
    User
    Account
    Transactions
    Data Duplication
    ⚡
    

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41. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User Account
    Account Transactions
    User
    Account
    Transactions
    Data Syncronisation
    🤯
    ⚡
    

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42. @duffleit
    clarify who owns which Data.
    Always
    

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43. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User Account
    Account Transactions
    User
    Account
    Transactions
    

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44. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Synchronous Calls
    😔
    

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45. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Synchronous Calls
    😔
    

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46. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User Cache
    Account
    Transactions
    Synchronous Calls
    😔
    

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47. @duffleit
    There must be a better solution
    🤔
    

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48. @duffleit
    There must be a better solution
    🤔
    Payments
    User
    Onboarding
    User
    pull
    

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49. @duffleit
    There must be a better solution
    🤔
    Payments
    User
    Onboarding
    User
    push
    

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50. @duffleit
    Payments
    Onboarding
    User Aggregate User Readmodel
    UserChangedEvent
    UserChange
    Command
    That's CQRS in a nutshell
    🥜
    update
    

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51. @duffleit
    Payments
    Onboarding
    User Aggregate User Readmodel
    UserChangedEvent
    UserChange
    Command
    Stream
    

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52. @duffleit
    Payments
    Onboarding
    User Aggregate User Readmodel
    UserChange
    Command
    Stream
    UserChangedEvent
    transform
    apply
    

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53. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

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54. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

    View Slide

55. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

    View Slide

56. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

    View Slide

57. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    Projections
    

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58. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    Projections
    

    View Slide

59. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    Projections
    

    View Slide

60. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    Projections
    

    View Slide

61. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

    View Slide

62. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    Projections
    

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63. @duffleit
    But didn't we just introduce
    Eventual Consistency?
    

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64. @duffleit
    The different faces of
    Eventual Consistency
    

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65. @duffleit
    Eventual Consistency
    Eventual Divergence
    Dashboard
    User (age: 22)
    UserChanged (age: 21)
    UserChanged (age: 22)
    Profile
    User (age: 21)
    ⚡
    timestamp
    timestamp
    

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66. @duffleit
    Eventual Consistency
    Eventual Divergence
    Eventual Variance
    Ledger
    Stream
    Transaction (+10€)
    🔥
    

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67. @duffleit
    Eventual Consistency
    Eventual Divergence
    Eventual Variance
    Ledger
    Dashboard
    Stream
    🔥 Transaction (+10€) Transaction (+10€)
    Balance: 20€
    

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68. @duffleit
    Eventual Consistency
    Eventual Divergence
    Eventual Variance
    Eventual Latency
    Service B
    Stream
    UserChanged (age: 21) UserChanged (age: 22)
    Profile
    User (age: 21)
    Dashboard
    User (age: 21)
    User (age: 22)
    

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69. Single User Context
    @duffleit
    Eventual Consistency
    Eventual Divergence
    Eventual Variance
    Eventual Latency
    Service B
    Stream
    UserChanged (age: 21) UserChanged (age: 22)
    Profile
    User (age: 21)
    Dashboard
    User (age: 21)
    User (age: 22)
    🕰
    

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70. @duffleit
    Eventual Consistency
    Eventual Divergence
    Eventual Variance
    Eventual Latency
    same events, different results.
    same events, different quantity.
    same events, different realisation.
    Ordering Guarantees
    Optimistic UIs
    At-Least-Once
    Delivery
    Deduplication
    Mechanisms
    

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71. @duffleit
    tl/dr:
    Eventual Consistency is
    often used as a
    knock-out argument
    @duffleit
    

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72. @duffleit
    tl/dr:
    Eventual Consistency is
    often used as a
    knock-out argument
    but isn't, in most cases.
    @duffleit
    

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73. @duffleit
    WebBanking
    New Payment
    💸
    € 20, 00
    👧
    Lisa
    to
    David
    from
    Perform Payment
    Payments
    Journey Services
    Onboarding Fraud Detection
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    Projections
    

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74. @duffleit
    Mobile Banking Usage
    93% — Show balance & last transactions
    3% — Initiate new payment
    4% — Any other functionality
    

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75. @duffleit
    Payments
    Journey Services
    Onboarding Overview
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

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76. @duffleit
    Payments
    Journey Services
    Onboarding Overview
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

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77. @duffleit
    Payments
    Journey Services
    Onboarding Overview
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

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78. @duffleit
    Payments
    Journey Services
    Onboarding Overview
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

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79. @duffleit
    Payments
    Journey Services
    Onboarding Overview
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    

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80. @duffleit
    Payments
    Journey Services
    Onboarding Overview
    User
    Account
    Account
    Transactions
    User
    Account
    Transactions
    Stream
    93% of what our users need
    can still be performed.
    WebBanking
    Current Balance: 200€
    👧
    You sent Lisa 100€
    Christoph sent you 300€
    

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81. @duffleit
    WebBanking
    Current Balance: 200€
    👧
    You sent Lisa 100€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    Overview
    Transactions
    We can easily scale
    horizontally.
    

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82. @duffleit
    WebBanking
    Current Balance: 200€
    👧
    You sent Lisa 100€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    Overview
    Transactions
    We can easily scale
    horizontally.
    

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83. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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84. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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85. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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86. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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87. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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88. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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89. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    

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90. @duffleit
    WebBanking of David
    Current Balance: 300€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    👧
    Lisa sent you 20€
    

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91. @duffleit
    WebBanking of David
    Current Balance: 320€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    👧
    Lisa sent you 20€
    

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92. @duffleit
    WebBanking of David
    Current Balance: 320€
    Christoph sent you 300€
    Payments
    Journey Services
    Onboarding Overview
    User Account
    Transactions
    User
    Account
    Transactions
    Stream
    WebBanking of Lisa
    👧
    New Payment
    💸
    € 20, 00 David
    to
    👧
    Lisa
    from
    Perform Payment
    👧
    Lisa sent you 20€
    GraphQL
    subscriptions
    mutations
    Out-of-the-box
    real-time
    capabilities.
    

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93. @duffleit
    WebBanking of David
    Current Balance: 320€
    Christoph sent you 300€
    Payments
    Journey Services
    Legacy System
    Accounts
    Stream
    👧
    Lisa sent you 20€
    User
    😮 💨😮 💨
    😮 💨
    Change Data
    Capture (CDC) User User
    

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94. Third Generation of MicroServices
    Built on Reactive Data-Streams
    @duffleit
    High Resilience
    🔥
    Horizontal Scaling ↔
    Real Time Integration
    ⏱
    Good Integration with Legacy Systems
    🏚
    

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95. Dimensions of Scaling
    @duffleit
    Vertical
    Horizontal
    Service
    

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96. Dimensions of Scaling
    @duffleit
    Vertical
    Horizontal
    Service
    

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97. Dimensions of Scaling
    Vertical
    Horizontal
    Service Service' Service''
    Stream
    

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98. Dimensions of Scaling
    Vertical
    Horizontal
    Service Service' Service''
    Stream
    

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99. Dimensions of Scaling
    Vertical
    Horizontal
    Service Service' Service''
    Sharding
    

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100. Dimensions of Scaling
     Vertical
     Horizontal
     Service
     Service'
     Service''
     Sharding
     Users A-H
     Users I-P
     Users Q-Z
     

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101. Dimensions of Scaling
     Vertical
     Horizontal
     Service
     Service'
     Service''
     User from
     User from
     Users from
     Service Service
     Service
     Sharding
     

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102. @duffleit
     UserTriggeredPayment
     

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103. @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     

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104. @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     

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105. @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     

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106. @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     ValidPaymentReceived
     

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107. @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     

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108. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     PaymentCheckedAgainstFraud
     

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109. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Stream
     PaymentChecked
     Partition 0 Partition 1 Partition 2
     

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110. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Stream
     PaymentChecked
     Partition 0 Partition 1 Partition 2
     Ledger Ledger Ledger
     TransactionBooked
     

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111. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Stream
     PaymentChecked
     Partition 0 Partition 1 Partition 2
     Ledger Ledger Ledger
     Partition 0 Partition 1 Partition 2
     Stream
     TransactionBooked
     

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112. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Partition 0 Partition 1 Partition 2
     Ledger Ledger Ledger
     Partition 0 Partition 1 Partition 2
     Projecting
     Transactions
     Streams
     Flink
     Stream
     PaymentChecked
     Stream
     TransactionBooked
     Independent Shards
     

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113. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Stream
     PaymentChecked
     Partition 0 Partition 1 Partition 2
     Ledger Ledger Ledger
     Partition 0 Partition 1 Partition 2
     Stream
     TransactionBooked
     Shard 0 Shard 1 Shard 2
     DataSink
     Streams
     Flink
     Projecting
     Transactions
     WebBanking WebBanking WebBanking
     

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114. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Stream
     PaymentChecked
     Partition 0 Partition 1 Partition 2
     Ledger Ledger Ledger
     Partition 0 Partition 1 Partition 2
     Stream
     TransactionBooked
     Shard 0 Shard 1 Shard 2
     DataSink
     Streams
     Flink
     Projecting
     Transactions
     WebBanking WebBanking WebBanking
     

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115. Fraud Detection Fraud Detection
     @duffleit
     Stream
     UserTriggeredPayment Partition 0 Partition 1 Partition 2
     UserTriggeredPayment
     Payments Payments Payments
     Stream
     ValidPaymentReceived
     Partition 0 Partition 1 Partition 2
     Fraud Detection
     Stream
     PaymentChecked
     Partition 0 Partition 1 Partition 2
     Ledger Ledger Ledger
     Partition 0 Partition 1 Partition 2
     Stream
     TransactionBooked
     Shard 0 Shard 1 Shard 2
     DataSink
     🚀 We can scale
     nearly unlimited.
     Projecting
     Transactions
     WebBanking WebBanking WebBanking
     

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116. Forth Generation of MicroServices
     Shared and fully Stream Based
     @duffleit
     Massive Throughput
     🚀
     Extremely Scalable ↔
     

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117. So many choices,
     Lets sum up.
     @duffleit
     

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118. Monolith
     @duffleit
     

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119. Monolith
     @duffleit
     

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120. Syncronously
     😩 Pain
     @duffleit
     

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121. Modulith
     @duffleit
     

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122. Asyncronously
     📦 Shared Data
     @duffleit
     

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123. Reactive
     ⚡ From Pull to Push
     @duffleit
     

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124. Streaming Massiv Throughput
     🚀
     @duffleit
     

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125. Monolith Reactive
     Push-Based
     Async
     Pull-Based
     Streamed
     Availability
     🟢
     , Resilience
     🦺
     , Scalability ↔ , Throughput
     🚀
     Complexity
     💰
     @duffleit
     The Rise of Reactive Microservices.
     And the future of fully Stream Based Architectures.
     

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126. David Leitner
     @duffleit
     Coding Architect
     david@squer.at
     @duffleit
     

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127. squer.link /
     slicing-microservices
     

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