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Looker

Definition

Looker is a commercial business-intelligence / dashboarding tool (now part of Google Cloud) widely deployed as a SQL-query client against data warehouses and lakehouses. Its semantic modelling layer (LookML) sits above the SQL engine and emits the generated SQL the engine executes.

Role in this wiki

Looker appears alongside Tableau as a canonical BI client whose workload shape (low per-query complexity, high concurrency, frequent metadata health-check queries) motivates a dedicated BI-cluster tier behind a query gateway.

Named explicitly as one of the two BI tools whose queries Trino Gateway routing rules detect via the X-Trino-Source HTTP header and redirect to BI-optimised Trino clusters (sources/2026-03-24-expedia-operating-trino-at-scale-with-trino-gateway).

Seen in

• sources/2026-03-24-expedia-operating-trino-at-scale-with-trino-gateway — named as a BI tool whose queries are routed to a BI-optimised Trino cluster via source-header-based routing.

Related

• systems/tableau — the other named BI tool in the same post.
• systems/trino — a common SQL-engine backend for Looker.
• systems/trino-gateway — routes Looker queries to BI clusters via X-Trino-Source header inspection.