Event History and Replay

The append-only log that lets any Worker reconstruct a Workflow's state

The most important hour of the course. Event History is the durable source of truth; replay is how a fresh Worker rebuilds Workflow state from it. You read a real history in the Web UI and in JSON, map every Command to its Event, and see why a DAG engine and Temporal are not the same kind of thing.

Estimated time: 90 minutes

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