ETL job with retries & dead letters template

Components in this data flow diagram

• Job starts
• Read checkpoint
• Fetch next batch
• Batch empty?
• Job complete
• Transform records
• Record-level errors?
• Dead letter table
• Upsert to target: idempotent
• Write succeeded?
• Retries left?
• Exponential backoff
• Fail job & alert
• Commit checkpoint
• Dead letters over 1%?

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 TD
  A((Job starts)) --> B[Read checkpoint]
  B --> C[Fetch next batch]
  C --> D{Batch empty?}
  D -->|Yes| Z((Job complete))
  D -->|No| E[Transform records]
  E --> F{Record-level errors?}
  F -->|Yes| G[(Dead letter table)]
  F -->|No| H[Upsert to target: idempotent]
  G --> H
  H --> I{Write succeeded?}
  I -->|No| J{Retries left?}
  J -->|Yes| K[Exponential backoff]
  K --> H
  J -->|No| L[Fail job & alert]
  I -->|Yes| M[Commit checkpoint]
  M --> C
  G --> N{Dead letters over 1%?}
  N -->|Yes| L

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