Cause (Documented platform behavior): Recorded stream reads must be deterministic on replay; concurrent reads would record values in scheduling-dependent order.
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://registry.npmjs.org/@dbos-inc/dbos-sdk/-/dbos-sdk-5.1.10.tgz#package/dist/src/error.js (official_docs, unknown, documented_behavior): DBOSStreamNondeterminismError message explains cause and fix.
Search phrasings: DBOS Cannot deterministically read stream another stream read in the same workflow is still in progress
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Workflow fails on concurrent stream reads.
- Context
- Product: DBOS Transact (TypeScript) Component: workflow streams Operation: Agent workflow reading multiple DBOS streams concurrently (Promise.all over readStream) in workflow code Affected versions: unknown Environment: unknown Exception: DBOSStreamNondeterminismError Packages: @dbos-inc/dbos-sdk 5.1.10 Trigger: Two stream reads in flight inside workflow code.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- in the same workflow is still in progress, so which read records which value would depend on task scheduling. Read streams from sequential workflow code, or read them from a step.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [DBOS TS] DBOSStreamNondeterminismError "Cannot deterministically read stream X in workflow Y: another stream read in the same workflow is still in progress"
Recommended action: Read streams sequentially in the workflow, or read them inside a step.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 6ee89538-da2b-442c-8f0d-48ce53800169
- Proposed action
- Recommended action: Read streams sequentially in the workflow, or read them inside a step.
- 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.