Apache Ossie

The lakehouse settled its lower layers on open standards. Files are Parquet. Tables are Iceberg. Catalogs speak the Iceberg REST protocol. Each of those started as several competing approaches and converged, and the convergence is why the substrate is shareable.

Semantics did not converge. Every BI tool, every metrics layer, and every warehouse has its own way of expressing what a metric means, and none of them can read each other’s.

Ossie is the effort to fix that: a vendor-neutral specification for semantic metadata.

Why this is now the binding constraint

Follow the argument this site makes and you arrive here. Agentic analytics needs governed semantic data. The governance has an open answer, in Polaris. The tables have an open answer, in Iceberg. The semantics do not.

So the definitions, the most business-specific and hardest-won part of the whole system, are the part most likely to be locked in one vendor’s format. Move BI tools and you rewrite them. Add an agent framework and you either reimplement them or let the agent guess.

That is backwards. The layer that took two years of arguments between finance and operations to agree on should be the most portable thing you own, not the least.

What a standard here buys

One definition, many consumers. The dashboard, the notebook, the embedded analytics in the product, and every agent resolve net_revenue to the same thing because they read the same definition, not because four teams reimplemented it carefully.

Definitions that outlive tools. Tooling churns. If the semantic model is expressed in an open format, changing the tool that reads it is a migration of one component rather than of the organisation’s accumulated understanding of itself.

Agents that can be pointed at it. An open specification means an agent framework can read the semantic model directly, without an integration per vendor. This is the difference between semantics being available to agents by default and being available to whichever agent someone built a connector for.

Where it is

Ossie is incubating at the ASF, which means the specification is still moving and it is early to build a critical path on it. That is worth stating plainly rather than presenting it as settled.

What is not early is the underlying decision. Whether or not you adopt Ossie today, express your semantic model in something you can export, keep it in version control, and treat it as an asset of the business rather than a configuration file inside a product. If the standard matures, you will be positioned to adopt it. If it does not, you still own your definitions.

Primary sources

• Apache Ossie The project, incubating at the Apache Software Foundation.
• SemanticLakehouse.com The semantic layer covered at length.

Apache Iceberg, Apache Polaris, Apache Parquet, Apache Arrow, and Apache Ossie are trademarks of the Apache Software Foundation. This site is independent and is not affiliated with or endorsed by the ASF. Project names describe subject matter only.