One night at a METRO depot

What does actually happen between order submission and goods delivery?
In this talk, we will provide insights into the domain of "Food Service Distribution" and outline how we ended up with our microservice-based solution. Additionally, we want to share our lessons learned from domain design, implementation,
and 24/7 operation of a large microservice platform.

Transcript

1. ONE NIGHT AT A METRO DEPOT HOW TO DELIVER FOOD WITH MICROSERVICES Silvia Schreier (METRO / @aivlis_s) Tobias Neef (INNOQ / @tobnee) 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 1
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15. | "SO WHAT HAPPENS DURING THE NIGHT?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 16
16. | CUSTOMER ORDER FULFILLMENT PROCESS 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 17 Order Management Tour Planning Picking Delivery Preparation Loading & Delivery External Picking
17. | "HOW DID WE SCALE THE DEVELOPMENT OF THIS SOLUTION?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 20
18. | CUSTOMER ORDER FULFILLMENT PROCESS 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 21 Order Management Tour Planning Picking Delivery Preparation Loading & Delivery External Picking
19. | NAIVE VERTICAL CUT 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 22 Order Management Tour Planning Picking Delivery Preparation Loading Delivery Where does the goods/stock come from? How to configure your depot? Who owns the order? What is about master data?
20. | A CLOSE TO REAL VERTICAL CUT 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 23 Order Management (Order Preparation, Exception Handling, Delivery Preparation, Invoicing) Tour & Transport Planning Picking & Packing Loading & Delivery Depot Management (Layout, Stock Management, Labour & Job Management Goods Receiving, Replenishment) Articles Customers ... Merchandising System Till ... Picking & Packing
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23. | MOBILE PICKING APP 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 28
24. | "WHAT ARE OUR CONSTRAINTS?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 29
25. | MARCO ARCHITECTURE CONSTRAINTS • Verticals are expected to run in a loosely coupled manner (process and data) • Most infrastructure options are bound to the context of one vertical • Cross vertical communication is done via HTTP • Services are expected to be stateless (with exceptions for caching to some extent) • No code is to be shared between verticals • Verticals are deployed continuously 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 30
26. | INFRASTRUCTURE CONSTRAINTS • Applications are expected to run in a multi DC environment • Services are running on K8s • Applications are deployed as Docker images (handover between the platform and teams) • The provided database is Cassandra and PostgreSQL being on its way • Kafka can be used as a message system / store • Logs and Metrics are shipped and made available for analysis by the platform 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 31
27. | "HOW DOES THIS NOW CONNECT TO MICRO SERVICES?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 32
28. | 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 33 Pick And Pack Order Mgmt Orders Depot Mgmt Locations Transport Mgmt Shipments Order Mgmt Order Status Depot Mgmt Stock Reduction Driver App SSCCs
29. | THE INGEST INTEGRATION MODEL © METRO AG. One night at a METRO depot – How to deliver food with microservices Pick And Pack Order Mgmt Orders Depot Mgmt Locations Transport Mgmt Shipments Ingest Reporter Reporter Reporter
30. | External Ingest Kafka Pick & Pack Service Cassandra 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 35
31. | CURRENT OPP SERVICES 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 36 Ingest Picking Wave Planning Packing Print Zones Worker UI Outbound Monitoring Supervisor UI
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33. | MOBILE PICKING APP 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 38
34. | "HOW DO SPAS AND VERTICALS FIT TOGETHER?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 39
35. | OPP ARCHITECTURE SUMMARY • The Vertical is as a whole builds a Self-contained System (SCS) • The UI of the vertical should not be shared • The persistence infrastructure we use is used exclusively by the vertical • The vertical should function for some time without other systems being available (replication) • The vertical is owned by one team but others are allowed to do changes • The services of a vertical are hosts to one or more aggregate • References between aggregates happen in the UI or via replication 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 40 http://scs-architecture.org/
36. | "NO DIGITALIZATION WITHOUT BUSINESS KNOWLEDGE & IT CAPABILITIES" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 41
37. | EVENT STORMING 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 42
38. | "HOW MANY DEVELOPERS FIT INTO A VERTICAL?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 43
39. | "HOW TO MANAGE ARCHITECTURE IN A BIG TEAM?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 44
40. | "WHEN TO SPLIT UP A VERTICAL?" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 45
41. | "WE ARE NOT ALONE!" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 47
42. | 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 48 YOU BUILD IT. YOU RUN IT. REALLY?
43. | "BECOME RESILIENT!" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 49
44. | 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 50 "MONITORING HELPS"
45. | 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 51 Al "ALERTING IS EVEN BETTER"
46. | "KNOW YOUR SYSTEM" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 52
47. | "LEARN FROM YOUR MISTAKES" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 53
48. | ”QUALITY & CONTINUOUS DEPLOYMENT" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 54
49. | "PREPARE YOUR SYSTEMS AND ORGANIZATION FOR CONTINUOUS IMPROVEMENT" 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 55
50. Silvia Schreier Product Owner silvia.schreier@metro.de @aivlis_s https://www.metroag.de 22.3.2017 © METRO AG. One night at a METRO depot – How to deliver food with microservices 56 Tobias Neef Senior Consultant tobias.neef@innoq.com @tobnee https://www.innoq.com