Blazegraph

Blazegraph

Developer(s)	Systap
Stable release	2.1.5 / 19 March 2019 (2019-03-19)[1]
Preview release	2.1.6rc / 3 February 2020 (2020-02-03)[1]
Repository	github.com/blazegraph/database
Written in	Java
Type	Graph database
License	GNU GPL (version 2)[2]
Website	blazegraph.com

Blazegraph is an open source triplestore and graph database,[3][4][5][6] written in Java. It has been abandoned since 2020 and is known to be used in production by WMDE for the Wikidata SPARQL 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.[7]

Early history

The system was first known as Bigdata. Since release of version 1.5 (12 February 2015), it is named Blazegraph.[8][9]

Prominent users

• The Wikimedia Foundation uses Blazegraph for the Wikidata Query Service, which is a SPARQL endpoint.[10]
• Sophox, a fork of the Wikidata Query Service, specializes in OpenStreetMap queries.[11]
• The Datatourisme project uses Blazegraph as the database platform; however, GraphQL is used as the query language instead of SPARQL.[12]

Notable features

• RDF* — an alternative approach to RDF reification,[13] which gives RDF graphs capabilities of LPG graphs;[14]
• as the consequence of the previous, ability of querying graphs both in SPARQL and Gremlin;[15][16]
• as an alternative to Gremlin querying, GAS abstraction over RDF graphs support in SPARQL;[17]
• The SERVICE syntax of federated queries for functionality extending;[18]
• Managed behavior of the query plan generator;[19]
• Reusable named subqueries.[20]

Acqui-hiring by Amazon Web Service (AWS)

It was alleged[21] that Amazon Neptune is based on Blazegraph, as evidenced by:

• acquiring of the Blazegraph trademark by AWS;[22]
• acquiring of the blazegraph.com domain name by AWS;[23]
• transition of many employees (including CEO) to AWS.[24]

References

1. "Releases - blazegraph/database". Retrieved 8 March 2020 – via GitHub.
2. "LICENSE.txt file". Retrieved 8 March 2020 – via GitHub.
3. Kiryakov, Atanas; Mariana, Damova (2011). "Chapter 7: Storing the Semantic Web: Repositories". In Domingue, John; Fensel, Dieter; Hendler, James A. (eds.). Handbook of Semantic Web Technologies. Springer-Verlag Berlin Heidelberg. pp. 271–272. ISBN 978-3-540-92912-3.
4. Thompson, Bryan; Personick, Mike; Cutcher, Martin (2014). "Chapter 8: The bigdata RDF Graph Database". In Harth, Andreas; Hose, Katja; Schenkel, Ralf (eds.). Linked data management. CRC Press. pp. 193–237. ISBN 978-1-466-58240-8.
5. Sikos, Leslie (2015). Mastering structured data on the Semantic Web. APress. p. 171. ISBN 978-1-4842-1049-9.
6. Sakr, Sh.; Wylot, M.; Mutharaju, R.; Le Phuoc, D.; Fundulaki, I. (2018). Linked Data: Storing, Querying, and Reasoning. Springer International Publishing Imprint Springer. pp. 70–71. ISBN 978-3-319-73515-3.
7. "Blazegraph fork?". GitHub. 12 April 2018.
8. "Blazegraph - Semantic Web Standards". W3.org. Retrieved 29 August 2018.
9. "Announcing Blazegraph Release 1.5.0 | Blazegraph(tm)". blog.blazegraph.com. Retrieved 17 September 2018.
10. "[Wikidata-tech] Wikidata Query Backend Update (take two!)". lists.wikimedia.org. Retrieved 29 August 2018. (The message also contains a link to the graph databases comparison performed by Wikimedia.)
11. Bast, Hannah; Brosi, Patrick; Kalmbach, Johannes; Lehmann, Axel (2–5 November 2021). An Efficient RDF Converter and SPARQL Endpoint for the Complete OpenStreetMap Data (PDF). SIGSPATIAL. Beijing: Association for Computing Machinery. doi:10.1145/3474717.3484256. ISBN 978-1-4503-8664-7.
12. "Principes de l'API". Framagit.io (in French). Retrieved 29 August 2018.
13. Hartig, Olaf; Thompson, Bryan (2014). "Foundations of an Alternative Approach to Reification in RDF". arXiv:1406.3399 [cs.DB].
14. Hartig, Olaf (2014). "Reconciliation of RDF* and Property Graphs". arXiv:1409.3288 [cs.DB].
15. "TinkerPop-enabled Providers". tinkerpop.apache.org. Archived from the original on 10 February 2018. Retrieved 29 August 2018. (Currently, the Blazegraph logo is replaced with the Amazon Neptune logo.)
16. "Blazegraph TinkerPop Implementation". GitHub.com. Retrieved 29 August 2018.
17. Fu, Zhisong; Personick, Michael (2014). MapGraph: A High Level API for Fast Development of High Performance Graph Analytics on GPUs. pp. 1–6. ISBN 978-1-4503-2982-8. {{cite book}}: |journal= ignored (help)
18. "Wikidata Query Service: User manual. Extensions". MediaWiki.org. Retrieved 29 August 2018.
19. "Query Hints". Blazegraph Wiki. Retrieved 29 August 2018.
20. "Named Subquery". Blazegraph Wiki. Retrieved 29 August 2018.
21. "SPARQL and Amazon Web Service's Neptune database". Bob DuCharme's weblog. Retrieved 29 August 2018.
22. "BLAZEGRAPH Trademark of Amazon Technologies, Inc.. Serial Number: 86498414". Trademarkia.com. Retrieved 29 August 2018.
23. "blazegraph.com". ICANN WHOIS. Retrieved 29 August 2018.
24. "Bradley Bebee". LinkedIn.com. Retrieved 29 August 2018.

External links

• Official website
• Page on DB-Engines.com