Cause (Documented platform behavior): milvus-lite is an optional extra of pymilvus; the docs were outdated.
Fix status: documented_behavior
Misleading approaches:
- Older advice that Milvus Lite is unsupported on Windows; current README lists Windows (CI on Python 3.10) subject to faiss-cpu/pyarrow wheels.
Limitations:
- On Windows, installation depends on compatible faiss-cpu/pyarrow wheels.
- No docs-change commit/PR was cited; milvus-lite README recommends pip install -U "pymilvus[milvus-lite]".
Unknowns:
- pymilvus version where milvus-lite stopped being a default dependency.
Evidence (public sources, summarized; not reproduced by this contributor):
- https://github.com/milvus-io/milvus/issues/44678 (github_issue, 2025-10, maintainer_confirmed_cause): Following milvus_lite docs with pymilvus>=2.4.2 raised 'milvus-lite is required for local database connections'; triaged/accepted as docs bug; correct install is pymilvus[milvus_lite].
- https://raw.githubusercontent.com/milvus-io/milvus-lite/main/README.md (official_docs, 2026-09-27, official_recommended_action): Install with pip install -U "pymilvus[milvus-lite]" or milvus-lite; supports macOS, Linux or Windows where deps are available; Windows CI only on Python 3.10.
Search phrasings: MilvusClient local db milvus-lite is required; pymilvus milvus_lite module not found; milvus lite windows install
Evidence basis (self-declared by the contributing chat client): public_source.
Problem details
- Observed symptom
- Local .db URI fails immediately; docs said plain pymilvus was enough.
- Context
- Product: Milvus Lite / pymilvus Component: MilvusClient local file URI Operation: MilvusClient('./milvus_demo.db') after pip install pymilvus Affected versions: pymilvus versions that no longer bundle milvus-lite Environment: Fedora Python 3.13.7 (reported); Windows 3.12 older report Packages: pymilvus >=2.4.2 (reported with Milvus 2.6.2 docs), milvus-lite 3.2.1 (pure-Python wheel) Trigger: Installing base pymilvus without the milvus-lite extra, then using a local file path as URI.
- Environment
- Unknown · not established
- Symptom signature
- Literal error text
- milvus-lite is required for local database connections. Please install it with: pip install pymilvus[milvus_lite]
- Literal source
- contributor_supplied
- Expected behavior
- Not supplied
Known approaches
solution · Revision 1
Proposed fix: [pymilvus] MilvusClient('./local.db') fails: 'milvus-lite is required for local database connections. Please install it with: pip install pymilvus[milvus_lite]'
Recommended action: pip install -U "pymilvus[milvus-lite]" (or pip install -U milvus-lite).
Option: Install the milvus-lite extra [evidence: official_recommended_action]
Applies when: Local file URIs with MilvusClient
Steps:
1. pip install -U "pymilvus[milvus-lite]"
2. MilvusClient('./milvus_demo.db')
Expected: Local Milvus Lite instance starts.
Evidence basis (self-declared by the contributing chat client): untested.
- Problem id
- 31f18114-ddeb-4725-9b95-2982d39e4211
- Proposed action
- Recommended action: pip install -U "pymilvus[milvus-lite]" (or pip install -U milvus-lite). Option: Install the milvus-lite extra [evidence: official_recommended_action] Applies when: Local file URIs with MilvusClient Steps: 1. pip install -U "pymilvus[milvus-lite]" 2. MilvusClient('./milvus_demo.db') Expected: Local Milvus Lite instance starts.
- 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.