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What is an Event History?

An append-log of Events for your application.

  • Event History is durably persisted by the Temporal service, enabling seamless recovery of your application state from crashes or failures.
  • It also serves as an audit log for debugging.

Event History limits

The Temporal Cluster stores the complete Event History for the entire lifecycle of a Workflow Execution.

A Workflow Execution Event History has a hard limit of 50,000 Events, as well as a hard limit of 50 MB in terms of size. The Temporal Cluster logs a warning at every 10,000 Events.

When the Event History reaches 50,000 Events or the size limit of 50 MB, the Workflow Execution is forcefully terminated.