nordisk/knut

knut

A pure-Rust columnar ↔ graph fabric — read/write Apache GraphAr, bulk-load FalkorDB, and serve Cypher over Arrow Flight SQL, with Bifröst streaming Iceberg tables into a live graph by CDC (Spark-Connect or Spark-free). One Arrow pipe from the lakehouse to a queryable graph.

⚡ part of the nordisk constellation

Mashup — one Arrow pipe: columnar lake → live graph

knut carries graph data the whole way from a columnar lake to a live, queryable graph in one Arrow pipe (no JVM required) — the rows marked NA are categories the rivals have no concept for:

Rows marked NA: the rival has no such category. The measured numbers are below.

Benchmarks

v0.1.3 · oden · 32 cores · 2026-07-23

⚠ 2 arms carrying a number that is not credible as real work. Each is marked ⚠ or withheld wherever it appears below — never published as a measurement:

ℹ 10 arms in this run belong to another repo (10 × nornir.*). They are the harness's own suite, pulled in because the bench runner this repo pins predates the arm filter that would have excluded them — so they were measured here without being asked for. They describe nornir, not knut, and are shown separately below rather than mixed into this repo's numbers.

The Arrow pipe — knut's own arms

Storage formats round-tripped through the GraphAr writer/reader, the Bifröst CDC fabric, the FalkorDB bulk path, and the Thund streaming window operators.

v0.1.3 · oden · 32 cores · 2026-07-23

⚠ withheld from this table — not credible as real work:

• bifrost_fabric — rows_per_s = 6.698e9/s derived from a 1.49e-5 s interval — under the 1e-4 s timing floor, so the rate is arithmetic, not measurement
• merge_property_groups — rows_per_s = 1.067e10/s derived from a 9.37e-6 s interval — under the 1e-4 s timing floor, so the rate is arithmetic, not measurement

telem_cores_busy_avg is the average number of CPU cores busy while the arm ran — a single-digit value on a 32-core host means the arm is serial by construction, not that the box was idle. Blank cells are metrics that arm does not report.

Borrowed arms — nornir's own suite, measured here by accident

v0.1.3 · oden · 32 cores · 2026-07-23

These arms measure nornir, not knut. knut/xtask pins nornir = "0.5" from crates.io, and that published runner predates the NORNIR_BENCH_ONLY arm filter — so the filter was accepted and silently ignored, and nornir's suite ran alongside knut's. They are kept in their own table so they can never be read as knut's numbers; the fix is a newer runner, not an edit to this file.

SQL for Power BI lives next door (2026-09-09)

knut's Flight SQL server (graphar-flight) speaks Cypher — the graph. Power BI, the Arrow Flight SQL ODBC driver and ADBC speak SQL, and that dialect is skade-flight in the skade repo: DataFusion over the Iceberg warehouse, streamed Arrow, ODBC escapes translated, 129 Power Query statement shapes green. Two dialects, two services, one wire; korp mounts both. The knut bridge — graph tables as DataFusion table providers in that same session — is the next step, not done.

Read the real docs

• 📖 The complete manual — docs/manual.pdf — every subsystem chapter (graphar, graphar-falkordb, graphar-flight, Bifröst, pipelines) plus the test & bench matrix.
• 📄 Full overview — .nornir/README-full.md — the detailed pitch, architecture, quickstart, per-crate reference, and the full test matrix.
• 📝 docs/book.md — the manual, as Markdown. Search it with nornir docs search knut "<query>".