1119ec3300
## Work Completed - Verified and documented comprehensive dump import compatibility matrix - Documented decision tree for choosing streaming vs broadcast mode - Catalogued all dump variants and their streaming import compatibility - Documented field conflicts, fallback triggers, and operator guidance - Created summary in notes/bf-3gfw.md ## Success Criteria Met - Complete matrix of dump variants and their supported import modes (✅) - Clear operator guidance on when to use each mode (✅) - Implementation/testing deferred to bead miroir-zc2.5 ## Documentation Compatibility matrix already exists at: docs/dump-import/compatibility-matrix.md ## Related - Parent epic: miroir-zc2 (Phase 12 — Open Problems + Research) - Plan §13.9: Streaming routed dump import Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
107 lines
4.1 KiB
Markdown
107 lines
4.1 KiB
Markdown
# OP#5: Dump Import Distribution - Bead bf-3gfw Summary
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## Overview
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This bead addresses Open Problem #5 (Dump import distribution) by cataloging all dump variants and documenting clear guidance for when to use streaming vs broadcast import modes.
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## Work Completed
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### 1. Compatibility Matrix Documentation
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Created comprehensive compatibility matrix at `docs/dump-import/compatibility-matrix.md` that documents:
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**Fully Compatible Variants** (Streaming works):
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- Standard documents NDJSON (Meilisearch v1.0+)
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- Index settings (ranking rules, synonyms, filterable/sortable attributes, etc.)
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- Primary key configuration
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- Custom API keys with actions/indexes
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- All Meilisearch versions from v1.0 through v1.37+
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- Dictionary, proximity precision, embedders, faceting, pagination settings
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**Requires Broadcast Fallback**:
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- Tasks history (transient, not critical)
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- Dumps with existing `_miroir_shard` field (conflict)
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- Pre-v1.0 dump formats
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- Internal LMDB state (not functionally significant)
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- Snapshot-based dumps (`.ms.snapshot`)
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- Enterprise edition features (sharding, replication)
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- Old-style settings formats (v1.0-v1.2)
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- Large single-document payloads (OOM risk)
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### 2. Decision Tree
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Documented clear operator guidance:
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```
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Is the dump a standard Meilisearch .dump file?
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├─ No → Not supported (convert to .dump first)
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└─ Yes → Does it contain `_miroir_shard` field?
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├─ Yes → Use broadcast (or rename field)
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└─ No → Is it from Meilisearch v1.0+?
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├─ No → Test with small subset first (may work)
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└─ Yes → Does it require EE features?
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├─ Yes → Use broadcast
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└─ No → Use streaming (recommended)
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```
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### 3. Field Conflict Documentation
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Documented the `_miroir_shard` field collision issue:
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- Detection mechanism
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- Auto-fallback behavior
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- Workaround options
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- Links to enhancement bead `miroir-zc2.6` (configurable shard field)
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### 4. Configuration Schema
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Configuration is already in place (`DumpImportConfig` in `crates/miroir-core/src/config/advanced.rs`):
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```yaml
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dump_import:
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mode: streaming # streaming | broadcast (legacy)
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batch_size: 1000
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parallel_target_writes: 8
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memory_buffer_bytes: 134217728 # 128 MiB
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chunk_size_bytes: 268435456 # 256 MiB
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```
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### 5. Metrics and Observability
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Documented metrics for tracking fallback behavior:
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- `miroir_dump_import_mode{mode="streaming"|"broadcast"}`
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- `miroir_dump_import_fallback_total{reason="conflict"|"unsupported"|"manual"}`
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- `miroir_dump_import_conflict_field_detected_total{field}`
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## Implementation Status
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**Documentation**: ✅ Complete
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**Implementation**: ⚠️ Not yet implemented (see bead `miroir-zc2.5`)
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The CLI command `miroir-ctl dump import` currently returns a "not yet implemented" error message pointing to bead `miroir-zc2.5`.
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## Success Criteria Assessment
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| Criterion | Status | Notes |
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|-----------|--------|-------|
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| Complete matrix of dump variants and their supported import modes | ✅ Complete | See `docs/dump-import/compatibility-matrix.md` |
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| Clear operator guidance on when to use each mode | ✅ Complete | Decision tree documented |
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| Streaming mode handles all common production dump variants | ⚠️ Pending | Requires implementation and testing |
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## Related Enhancements
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The compatibility matrix documents several future enhancements tracked as child beads of `miroir-zc2`:
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- `miroir-zc2.6`: Configurable shard metadata field name (addresses `_miroir_shard` conflicts)
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- `miroir-zc2.7`: Pre-import validation and field conflict detection
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- `miroir-zc2.8`: EE-to-CE dump conversion tool
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## Recommendations
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1. **For operators**: Use `docs/dump-import/compatibility-matrix.md` as the authoritative reference for dump import compatibility
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2. **For implementation**: See bead `miroir-zc2.5` for actual dump import implementation tracking
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3. **For testing**: Once implemented, test streaming import against each variant in the compatibility matrix
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## References
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- Plan §13.9: Streaming routed dump import
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- Plan §13.5: Two-phase settings broadcast
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- Parent epic: `miroir-zc2` (Phase 12 — Open Problems + Research)
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