Constants & tunables
Expand traversal dispatch. With OMNIGRAPHTRAVERSALMODE unset, the engine
| Name | Value | Where |
|---|---|---|
MANIFEST_DIR | __manifest | db/manifest/layout.rs |
| Commit graph dir | _graph_commits.lance | db/commit_graph.rs |
| Run registry dir (legacy, removed MR-771) | _graph_runs.lance | inert post-v0.4.0; bytes remain until a delete_prefix primitive lands |
| Run branch prefix (legacy, removed MR-771/MR-770) | __run__ | swept off __manifest by the v2→v3 migration; no longer a reserved name |
| Schema apply lock | __schema_apply_lock__ | db/mod.rs |
| Manifest publisher retry budget | PUBLISHER_RETRY_BUDGET = 5 | db/manifest/publisher.rs |
| Internal manifest schema version | INTERNAL_MANIFEST_SCHEMA_VERSION = 3 | db/manifest/migrations.rs |
| Merge stage batch | MERGE_STAGE_BATCH_ROWS = 8192 | exec/merge.rs |
| Maintenance concurrency | OMNIGRAPH_MAINTENANCE_CONCURRENCY=8 | db/omnigraph/optimize.rs |
| Lance blob compaction support | LANCE_SUPPORTS_BLOB_COMPACTION = false | db/omnigraph/optimize.rs |
| Graph index cache size | 8 (LRU) | runtime_cache.rs |
| Expand indexed-path frontier ceiling | OMNIGRAPH_EXPAND_INDEXED_MAX_FRONTIER=1024 | exec/query.rs |
| Expand indexed-path hop ceiling | OMNIGRAPH_EXPAND_INDEXED_MAX_HOPS=6 | exec/query.rs |
| Expand CSR-build cost factor | CSR_BUILD_FACTOR = 1.5 | exec/query.rs |
| Expand mode override | OMNIGRAPH_TRAVERSAL_MODE (indexed|csr; unset = cost-based auto) | exec/query.rs |
| Default body limit | 1 MB | omnigraph-server/lib.rs |
| Ingest body limit | 32 MB | omnigraph-server/lib.rs |
| Engine embed model | gemini-embedding-2-preview | omnigraph/embedding.rs |
| Compiler embed model | text-embedding-3-small | omnigraph-compiler/embedding.rs |
| Embed timeout | 30 000 ms | both clients |
| Embed retries | 4 | both clients |
| Embed retry backoff | 200 ms | both clients |
| LANCE memory pool default | 1 GB (raised in v0.3.0) | runtime |
Expand traversal dispatch. With OMNIGRAPH_TRAVERSAL_MODE unset, the engine
chooses the indexed (per-hop BTREE) vs CSR (whole-graph in-memory) path with a
cost model over cheap manifest counts (frontier size, |E|, source-vertex count,
hops) plus the index-coverage signal: the indexed path is preferred when its
frontier-relative work beats building the CSR (≈ when hops × frontier is a
small fraction of the source-vertex set), and CSR is preferred for dense/deep
traversals or when the BTREE coverage is degraded and a full scan would be paid
per hop. The two ceilings bound the initial dispatch frontier/hops (beyond
them CSR is always used); they are not a hard per-hop bound — the cost model
estimates total indexed work as ~hops × frontier × fanout, so dense fan-out is
priced toward CSR rather than capped mid-traversal. The override flag forces a path (the auto result is identical either way;
only the path differs).