Halyard

An RDF triple store built on Apache HBase and Hadoop using the Eclipse RDF4J framework. Distributes triple storage across an HBase cluster with support for named graphs and SPARQL 1.1 federation.

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Elsewhere

Overall rank: #92
First released: November 2016
License: Apache-2.0
Built with: Java

Lineage

Details

Vendor: Merck
Type: RDF
Category: Emerging
Status: Inactive — No development activity since mid-2022.
License: Apache-2.0
Language: Java
Query Languages: SPARQL
Protocols: HTTP/RESTSPARQL Protocol

Sources 5 references

Protocols SPARQL Protocol, HTTP/REST

Halyard is an RDF4J SAIL over HBase; queries reach it through RDF4J Server, which exposes a SPARQL endpoint plus REST repository-management calls.

RDF4J Server is a service server that provides a SPARQL endpoint for each managed repository as well as the REST access to the repository management functions.
Halyard | Tools · reviewed 2026-08-02

License Apache-2.0

SPDX identifier as classified by GitHub from the repository licence file.

"spdx_id": "Apache-2.0"
GitHub licence API — Merck/Halyard · reviewed 2026-08-02

Released 2016-11

GitHub repo creation date; Halyard had no prior existence before this repo, so it reliably marks first public availability. Confirms current value.

"created_at":"2016-11-23T21:50:51Z"
Merck/Halyard · reviewed 2026-08-02

Language Java

Confirms current value.

Halyard implementation is based on Eclipse RDF4J framework and Apache HBase database, and it is completely written in Java.
Merck/Halyard · reviewed 2026-08-02

Lineage based on Eclipse RDF4J

The implementation of Halyard is based on Eclipse RDF4J framework and the Apache HBase database
Halyard · reviewed 2026-09-23