Blazegraph is an open source

triplestore A triplestore or RDF store is a purpose-built database for the storage and retrieval of triples through semantic queries. A triple is a data entity composed of subject– predicate– object, like "Bob is 35" (i.e., Bob's age measured in years i ...

and

graph database A graph database (GDB) is a database that uses graph structures for semantic queries with nodes, edges, and properties to represent and store data. A key concept of the system is the graph (or edge or relationship). The graph relates the dat ...

, written in Java. It has been abandoned since 2020 and is known to be used in production by

WMDE WMDE (channel 36) is a television station licensed to Dover, Delaware, United States. Owned by WRNN-TV Associates, the station maintains a transmitter in the unincorporated community of Wye Mills in Talbot County, Maryland, southwest of Dove ...

for the

Wikidata Wikidata is a collaboratively edited multilingual knowledge graph hosted by the Wikimedia Foundation. It is a common source of open data that Wikimedia projects such as Wikipedia, and anyone else, are able to use under the CC0 public domain ...

SPARQL SPARQL (pronounced ":wikt:sparkle, sparkle", a recursive acronym for SPARQL Protocol and RDF Query Language) is an RDF query language—that is, a Semantic Query, semantic query language for databases—able to retrieve and manipulate data sto ...

endpoint. It is licensed under the GNU GPL (version 2). Amazon acquired the Blazegraph developers and the Blazegraph open source development was essentially stopped in April 2018.

Early history

The system was first known as ''Bigdata.'' Since release of version 1.5 (12 February 2015), it is named ''Blazegraph''.

Prominent users

* The

Wikimedia Foundation The Wikimedia Foundation, Inc. (WMF) is an American 501(c)(3) nonprofit organization headquartered in San Francisco, California, and registered there as foundation (United States law), a charitable foundation. It is the host of Wikipedia, th ...

uses Blazegraph for the

br>Query Service
which is a

endpoint. * Sophox, a fork of the Wikidata Query Service, specializes in

OpenStreetMap OpenStreetMap (abbreviated OSM) is a free, Open Database License, open geographic database, map database updated and maintained by a community of volunteers via open collaboration. Contributors collect data from surveying, surveys, trace from Ae ...

queries. * Th
Datatourisme
project uses Blazegraph as the database platform; however,

GraphQL GraphQL is a data query and manipulation language that allows specifying what data is to be retrieved (" declarative data fetching") or modified. A GraphQL server can process a client query using data from separate sources and present the res ...

is used as the

query language A query language, also known as data query language or database query language (DQL), is a computer language used to make queries in databases and information systems. In database systems, query languages rely on strict theory to retrieve informa ...

instead of

Notable features

* ''RDF*'' — an alternative approach to RDF reification, which gives RDF graphs capabilities of graphs; * as the consequence of the previous, ability of querying graphs both in

and

Gremlin A gremlin is a mischievous fictional creature invented at the beginning of the 20th century to originally explain malfunctions in aircraft, and later in other machinery, processes, and their operators. Depictions of these creatures vary widely. ...

; * as an alternative to

querying, abstraction over RDF graphs support in

; * The SERVICE syntax of federated queries for functionality extending; * Managed behavior of the

query plan A query plan (or query execution plan) is a sequence of steps used to access data in a SQL relational database management system. This is a specific case of the relational model concept of access plans. Since SQL is declarative, there are typical ...

generator; * Reusable named subqueries.

Acqui-hiring Acqui-hiring (a portmanteau of "acquisition" and "hiring") is the Mergers and acquisitions, acquisition of startups or other small companies primarily to acquire human capital. The term ''acqui-hire'' was coined in 2005. The phenomenon gained wides ...
by Amazon Web Service (AWS)

It was alleged that

Amazon Neptune Amazon Neptune is a managed graph database product published by Amazon.com. It is used as a web service and is part of Amazon Web Services (AWS). It was announced on November 29, 2017. Amazon Neptune supports popular graph models property graph a ...

is based on Blazegraph, as evidenced by: * acquiring of the ''Blazegraph''

trademark A trademark (also written trade mark or trade-mark) is a form of intellectual property that consists of a word, phrase, symbol, design, or a combination that identifies a Good (economics and accounting), product or Service (economics), service f ...

by AWS; * acquiring of the ''blazegraph.com''

domain name In the Internet, a domain name is a string that identifies a realm of administrative autonomy, authority, or control. Domain names are often used to identify services provided through the Internet, such as websites, email services, and more. ...

by AWS; * transition of many employees (including

CEO A chief executive officer (CEO), also known as a chief executive or managing director, is the top-ranking corporate officer charged with the management of an organization, usually a company or a nonprofit organization. CEOs find roles in variou ...

) to AWS.

References

External links