Serving
Durable operation
What is durable operation?
A durable operation is a long-running job that survives client disconnection and process restarts, with an append-only event log a client can replay from any position. It is what makes a multi-hour job observable without a permanently open connection.
The alternative — a job whose state lives only in a streaming connection — loses its history the moment the connection drops, and there is no way to find out what happened.
The event log also makes polling and streaming equivalent. A client can subscribe live or ask what happened after a given event, and get the same answer either way.
Related terms
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