Kappa architecture template

Components in this data flow diagram

• Apps
• Immutable event log: Kafka, long retention
• Devices
• CDC from databases
• Stream processor v1: Flink
• Serving view v1
• Query API & dashboards
• Logic change
• Stream processor v2
• Serving view v2
• v2 caught up?
• Drop view v1

How to use this data flow diagram template

1. Click Open in the editor. The data flow diagram opens on a new page in FlowDiagram — nothing is uploaded and there is no sign-up.
2. Rename, add or delete shapes and drag them where you want; connectors stay attached as things move.
3. Drop in vendor logos from the library — 1,160 of them, including every AWS, Azure and Google Cloud service icon — or restyle it with the colour and theme controls.
4. Prefer text? Edit the Mermaid source below and paste it in through ☰ → Import diagram (see the Mermaid editor); it imports as an editable diagram.
5. Export to PNG, SVG or PDF, or press Ctrl+L for a link that carries the whole diagram.

Mermaid source

The whole template is the text below. Paste it into FlowDiagram, keep it in Git next to the code it describes, or hand it to an AI assistant to extend.

flowchart LR
  SRC1((Apps)) --> LOG[(Immutable event log: Kafka, long retention)]
  SRC2((Devices)) --> LOG
  SRC3((CDC from databases)) --> LOG
  LOG --> SP[Stream processor v1: Flink]
  SP --> VIEW1[(Serving view v1)]
  VIEW1 --> API[Query API & dashboards]
  CHANGE((Logic change)) --> SP2[Stream processor v2]
  LOG -->|replay from offset 0| SP2
  SP2 --> VIEW2[(Serving view v2)]
  VIEW2 --> SWITCH{v2 caught up?}
  SWITCH -->|Yes| API
  SWITCH -->|No| SP2
  SWITCH -->|Yes| DROP[Drop view v1]

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