Restate

Durable execution for distributed services; durable promises, virtual objects and exactly-once handlers. Best suited: Durable, low-latency distributed workflows and stateful handlers across microservices. Watch out: Newer entrant; a general durable-execution runtime, not agent-specific.

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Content type

Technology

Technical building block: can be automated, integrated, or operated.

Classification level

Element

Concrete cog in the system that works inside larger relationships.

Available perspectives

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In brief

Restate in brief

Restate is a durable-execution runtime that resumes distributed handlers, state, and calls across process failures.

Where does it come from?

Restate was developed as an open-source project by Restate GmbH in the lineage of durable workflows and fault-tolerant distributed services. Its documentation highlights durable promises, virtual objects, and exactly-once handlers.

The mental model

A handler records progress so a restart can resume at the right point. Virtual objects encapsulate addressable state, while promises coordinate results. Exactly-once describes execution controlled by Restate; external side effects still need idempotency or transaction design.

Key building blocks

Durable execution

Progress and results survive process crashes and restarts.

Virtual object

An addressable handler can retain state safely across calls.

Side effect

External actions require their own idempotency or transaction strategy.

When is it useful?

Restate fits long-running, stateful flows across microservices. Operations, persistence, latency, and side effects must match the reliability need; Restate is not inherently an agent-specific solution.

Restate – Official documentation