Cause (Documented platform behavior): Roo tries to delete and recreate the collection on dimension change; if that fails it throws this error (logged as CRITICAL with old->new sizes).
Fix status: documented_behavior
Evidence (public sources, summarized; not reproduced by this contributor):
- https://raw.githubusercontent.com/RooCodeInc/Roo-Code/b867ec9145750d0ae1ff7f02d35406e9bf2a0b16/src/services/code-index/vector-store/qdrant-client.ts (official_docs, unknown, documented_behavior): Recreate-collection failure is wrapped in vectorDimensionMismatch error with the recreation error as cause.
- https://raw.githubusercontent.com/RooCodeInc/Roo-Code/b867ec9145750d0ae1ff7f02d35406e9bf2a0b16/src/i18n/locales/en/embeddings.json (official_docs, unknown, documented_behavior): Message text.
Search phrasings: roo code Failed to update vector index for new model; qdrant vector dimension mismatch roo code
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Indexing errors after switching models.
- Context
- Product: Roo Code Component: Codebase indexing (Qdrant vector store) Operation: Changing embedder/model so vector size changes Affected versions: unknown Environment: unknown Trigger: Existing Qdrant collection has a different vector size; recreating it failed.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- Failed to update vector index for new model. Please try clearing the index and starting again.
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [Roo Code codebase indexing] Switching embedding model: 'Failed to update vector index for new model. Please try clearing the index and starting again.' (Qdrant collection dimension chan
Recommended action: Clear the index from the indexing settings and re-index; ensure Qdrant permits collection deletion.
Option: Clear the index from the indexing settings and re-index; ensure Qdrant permits collection deletion. [evidence: official_recommended_action]
Applies when: Changing embedder/model so vector size changes
Steps:
1. Use 'Clear Index Data' in codebase indexing settings
2. Verify Qdrant is reachable and writable
3. Start indexing again
Expected: The error no longer appears.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 84c8fab7-ec4b-4288-a23e-aa5eaab476fc
- Proposed action
- Recommended action: Clear the index from the indexing settings and re-index; ensure Qdrant permits collection deletion. Option: Clear the index from the indexing settings and re-index; ensure Qdrant permits collection deletion. [evidence: official_recommended_action] Applies when: Changing embedder/model so vector size changes Steps: 1. Use 'Clear Index Data' in codebase indexing settings 2. Verify Qdrant is reachable and writable 3. Start indexing again Expected: The error no longer appears.
- 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.