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42 lines
3 KiB
Markdown
42 lines
3 KiB
Markdown
# Constants & Tunables (cheat sheet)
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| Name | Value | Area |
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|---|---|---|
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| `MANIFEST_DIR` | `__manifest` | manifest layout |
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| Commit graph dir | `_graph_commits.lance` | commit graph |
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| Run registry dir (legacy, removed) | `_graph_runs.lance` | inert post-v0.4.0; bytes remain until a prefix-delete primitive lands |
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| Run branch prefix (legacy, removed) | `__run__` | swept off `__manifest` by the internal schema migration; no longer a reserved name |
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| Schema apply lock | `__schema_apply_lock__` | schema apply |
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| Manifest publisher retry budget | `PUBLISHER_RETRY_BUDGET = 5` | manifest publish |
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| Internal manifest schema version | `INTERNAL_MANIFEST_SCHEMA_VERSION = 3` | manifest migrations |
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| Merge stage batch | `MERGE_STAGE_BATCH_ROWS = 8192` | merge execution |
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| Maintenance concurrency | `OMNIGRAPH_MAINTENANCE_CONCURRENCY=8` | optimize/cleanup |
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| Lance blob compaction support | `LANCE_SUPPORTS_BLOB_COMPACTION = false` | optimize |
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| Graph index cache size | `8` (LRU) | runtime cache |
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| Expand indexed-path frontier ceiling | `OMNIGRAPH_EXPAND_INDEXED_MAX_FRONTIER=1024` | traversal |
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| Expand indexed-path hop ceiling | `OMNIGRAPH_EXPAND_INDEXED_MAX_HOPS=6` | traversal |
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| Expand CSR-build cost factor | `CSR_BUILD_FACTOR = 1.5` | traversal |
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| Expand mode override | `OMNIGRAPH_TRAVERSAL_MODE` (`indexed`\|`csr`; unset = cost-based auto) | traversal |
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| Default body limit | `1 MB` | HTTP server |
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| Ingest body limit | `32 MB` | HTTP server |
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| Default embed provider/model | `openai-compatible` / `openai/text-embedding-3-large` | engine embedding |
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| OpenAI-direct embed model | `text-embedding-3-large` | engine embedding |
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| Gemini-direct embed model | `gemini-embedding-2` | engine embedding |
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| Embed deadline | `OMNIGRAPH_EMBED_DEADLINE_MS=60000` | engine embedding |
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| Embed timeout | `OMNIGRAPH_EMBED_TIMEOUT_MS=30000` | engine embedding |
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| Embed retries | `OMNIGRAPH_EMBED_RETRY_ATTEMPTS=4` | engine embedding |
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| Embed retry backoff | `OMNIGRAPH_EMBED_RETRY_BACKOFF_MS=200` | engine embedding |
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| LANCE memory pool default | `1 GB` (raised in v0.3.0) | runtime |
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**Expand traversal dispatch.** With `OMNIGRAPH_TRAVERSAL_MODE` unset, the engine
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chooses the indexed (per-hop BTREE) vs CSR (whole-graph in-memory) path with a
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cost model over cheap manifest counts (frontier size, |E|, source-vertex count,
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hops) plus the index-coverage signal: the indexed path is preferred when its
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frontier-relative work beats building the CSR (≈ when `hops × frontier` is a
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small fraction of the source-vertex set), and CSR is preferred for dense/deep
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traversals or when the BTREE coverage is degraded and a full scan would be paid
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per hop. The two ceilings bound the **initial dispatch** frontier/hops (beyond
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them CSR is always used); they are not a hard per-hop bound — the cost model
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*estimates* total indexed work as ~`hops × frontier × fanout`, so dense fan-out is
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priced toward CSR rather than capped mid-traversal. The override flag forces a path (the `auto` result is identical either way;
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only the path differs).
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