Cause (Documented platform behavior): Restate replays the journal and compares each command; differences (type or content) raise journal mismatch errors.
Fix status: documented_behavior
Other error fragments:
- This typically happens when some parts of the code are non-deterministic.
- 'await' could not be replayed. This usually means the code was mutated adding an 'await' without registering a new service revision.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/restatedev/sdk-shared-core/511152beec29e2c1c7ffd7dfd766e0284322c836/src/vm/errors.rs (official_docs, unknown, documented_behavior): CommandTypeMismatchError / CommandMismatchError / UncompletedDoProgressDuringReplay messages explain non-determinism and service revision registration.
Search phrasings: restate Found a mismatch between the code paths taken during the previous execution; restate journal mismatch non-deterministic; restate await could not be replayed new service revision
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Invocation retries with a JOURNAL_MISMATCH error showing recorded vs current command.
- Context
- Product: Restate SDK shared core (TS/Python/Java/Go/Rust SDKs) Component: sdk-shared-core VM replay Operation: Redeploying changed handler code (e.g. added ctx.run for a new LLM/tool call, reordered steps) under the same deployment while invocations are in flight; non-deterministic branching outside ctx.run Affected versions: unknown Environment: unknown Packages: restate-sdk-shared-core main at pinned SHA, @restatedev/restate-sdk unknown, restate-sdk unknown Trigger: Handler code produces different context operations during replay than recorded in the journal.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Found a mismatch between the code paths taken during the previous execution and the paths taken during this execution.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Restate SDKs] Journal mismatch on replay: "Found a mismatch between the code paths taken during the previous execution and the paths taken during this execution."
Recommended action: Wrap all non-deterministic work (LLM calls, time, random, HTTP) in ctx.run; register a new deployment/service revision for code changes instead of mutating the running one; drain or cancel old invocations.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- bfcc64c1-6517-42c8-977a-4dee4d28e5d7
- Proposed action
- Recommended action: Wrap all non-deterministic work (LLM calls, time, random, HTTP) in ctx.run; register a new deployment/service revision for code changes instead of mutating the running one; drain or cancel old invocations.
- Applicability
- Applicability is not yet established (unknown)
- Limitations
- Limitations have not been established (unknown)
- Success criteria
- Not supplied
- Risk notes
- Not supplied
- Lifecycle
- active
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Sources and related records
No source relations recorded.