Core Engine

IOMETE Unified Multi-Catalog

Category
Core Engine
Status
Planned
Priority
Medium
Last Updated
October 13, 2025

Overview

Problem:
  • Today you must choose one catalog per storage format (Iceberg, Hive-metastore, …).
  • Hive Metastore only works under spark_catalog, is tied to a V1 API, and blocks us from modern security & lineage features.
  • Teams therefore juggle multiple catalogs, duplicate grants, and can't query JSON/CSV/ORC tables alongside Iceberg in a single namespace.
What we are building:
  • We are introducing Unity Catalog for IOMETE – a format-agnostic, V2-API data catalog that becomes the single source of truth for all tables (Iceberg, Parquet, JSON, CSV, ORC today; Hudi, Delta & others next).
  • Any Spark catalog you create will be able to register heterogeneous tables without restrictions, so logical domains (e.g. finance, marketing) no longer leak physical storage choices.
Why this matters (Value)

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Theme Benefit
Operational simplicity One catalog to deploy, back up, secure and monitor.
Developer velocity Create a table in the best-fit format and query it instantly – no migration or re-registration.
Governance Centralised RBAC & auditing across formats; paves the way for column-level lineage.
Modern APIs Fully on the Spark Catalog V2 interface – no Hive classes on the classpath, no legacy config knobs.

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Planned Features

  • Read/write support: Iceberg, Parquet, JSON, CSV, ORC
  • Namespace & table-level ACLs via GRANT/REVOKE
  • JDBC/ODBC discovery
  • Migration utility: automatic import of existing Hive Metastore schemas into Unity
  • Add Hudi & Delta tables
  • Column-level lineage & tags
  • Fine-grained privileges (column, row filter, mask)
  • UI explorer inside IOMETE Console

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