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Nimtable is an open source lightweight web platform for exploring and managing Apache Iceberg catalogs and tables. It provides a browser UI and REST API to explore catalog metadata, inspect table layouts, and orchestrate routine maintenance by delegating work to compute engines like RisingWave or Spark. Nimtable is open source under the Apache License 2.0; the source code is available at nimtable/nimtable.
Nimtable dashboard showing table counts, compaction status, and Copilot side panel

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What Nimtable does

  • Browse catalogs, schemas, tables, partitions, snapshots, and manifests
  • Visualize snapshot and file distribution to spot optimization opportunities
  • Run quick SQL queries in the browser for metadata inspection
  • Act as an Iceberg REST Catalog endpoint for engines including RisingWave
  • Configure catalogs through the UI or a config.yaml file
  • Support common catalog backends: REST, AWS Glue, S3 Tables, and JDBC/PostgreSQL

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How it fits with RisingWave

  • Register Nimtable’s REST endpoint as an Iceberg catalog in RisingWave, then create sources, sinks, or connections against it
  • Inspect Iceberg tables that RisingWave writes, including schema, snapshots, and file layout
  • Plan maintenance flows (compaction, optimization) while continuing to use RisingWave for incremental writes and reads

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Architecture at a glance

  • Web UI on port 3000 for interactive management
  • REST Catalog API (default 8182) that fronts supported Iceberg catalog backends
  • Metadata stored in PostgreSQL (configurable)
  • Catalog definitions can be stored in Nimtable’s internal database (via UI) or provisioned via config.yaml

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When to use Nimtable

  • You want a UI to explore and troubleshoot Iceberg tables produced or consumed by RisingWave
  • You need a REST Catalog endpoint and prefer a managed control plane over standing up a catalog service yourself
  • You want a single place to add catalogs and reuse them across RisingWave, Spark, or other engines

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Next steps