Questions tagged [blazegraph]

Blazegraph is an open-source RDF/graph database capable of clustered deployment. This tag is specific for questions on the database API. RDF and SPARQL are often related technologies.

Overview

Blazegraph is an open-source, ultra-scalable, high-performance graph database written in Java. It supports various technologies such as:

Blazegraph offers different operating modes (triples, provenance, and quads) and either operates as an embedded database or over a client/server REST API.

Blazegraph supports up to 50 billion edges on a single machine and has a high availability and scale-out architecture. It is in production use for Fortune 500 customers such as EMC, Autodesk, and many others. It was selected by the Wikimedia foundation to power their Wikidata query service.

Documentation links

The official Blazegraph website can be found here. In-depth technical details on the graph database can be found in the official Blazegraph Wiki. The Blazegraph API itself is documented on GitHub.

Background information on the big-data architecture, internals, and deployment models can be found in several white papers in the Blazegraph Blog.

When to use this tag

Please use the tag on questions about the database API. If you have a more general question to which an answer might not necessarily depend on the Blazegraph API, please consider including or .

If you want to discuss or suggest Blazegraph features, please do it via the Blazegraph contact page.

Related tags

Adapted from the Blazegraph website and the Blazegraph Wiki.

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Turn off Blazegraph inference

When I add triples that use rdfs:subPropertyOf, Blazegraph adds a reflexive triple. After doing some research, I came to the conclusion that I could turn off this behavior by going into the blazegraph.properties file and uncommenting this…
asterix
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Connect Jena 2.6.2 with BlazeGraph

Hy everyone, For a project I have to use Apache Jena 2.6.2 as an API and Blazegraph as a triple store, So i want to use RDFConnection conn = RDFConnectionFactory.connectfor connecting Jena with blazegraph but the class RDFConnection is not resolved…
Meed095
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transform my rdf file to a named graph file

For a project I have to use Apache Jena as an API and Blazegraph as a triple store, I am trying to program a code that allows me to transform my dataset (N-Triples File) to a file that contains the NamedGraph of each statement. String APIUrl =…
Meed095
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How to bind a string with a variable in SPARQL

The following query PREFIX dc: PREFIX edm: PREFIX ore: SELECT * { SERVICE { ?CHO…
Fabio Ricci
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Blazegraph bigdata.war 2.1.5 allowing SPARQL SERVICE from "outside"

I am running bigdata 2.1.5 on a tomcat on a OSX system. This is giving a /bigdata/ URI which shows up a running html console of Blazegraph. This bigdata instance "DBPedia" is using a journal with DBPedia triples inside. DBPedia is showing up to the…
Fabio Ricci
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Load File using Apache Jena with Blazegraph as a TripleStore

For a project I have to use Apache Jena as an API and Blazegraph as a triple store, but I have problems when I load my file by using RDFConnection.load String APIUrl = "http://10.13.102.52:9999/blazegraph/namespace/ProjBD/sparql/ProjBD/sparql"; …
Meed095
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comparing labels in a federated query

I have an instance of Wikibase running. I'm able to run federated queries with Wikidata successfully. I have certain queries that compare labels like this: PREFIX xwdt: PREFIX xwd:…
Elfalem
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SPARQL: Insert query results as RDF LIST

I want to get from graph A results bound to a specific variable lets say ?s. Next I want to insert those results as an RDF list in graph B. This is my SPARQL Update: prefix foo: insert { graph { ?var…
whitefang1993
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Slow BlazeGraph SPARQL Queries with UNION and FILTER

I'm doing SPARQL queries on Blazegraph RDF Graph database against the Wikidata query service. These queries involve several UNION and typically a FILTER like SELECT DISTINCT ?music_track ?music_trackLabel ?artist ?artistLabel ?album ?albumLabel…
loretoparisi
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blazegraph delete with query deletes entire namespace rather than just construct results

I am issuing a DELETE REST call to my local blazegraph: http://localhost:9999/blazegraph/namespace/GraphInfo with the body: PREFIX rsabox: PREFIX rstbox: CONSTRUCT { ?result…
wnm3
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Wikidata statement ordering

I am using the RDF dump format of Wikidata, according to Wiki this format does not have the ordering of statements. I want to have attributes always in order, such as this "inception" is always followed by "official names",…
William
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SPARQL CONSTRUCT; not all results are retrieved

I am tying to construct an RDF graph containing films and their labels on Wikidata SPARQL query service. Basically, this is the query I thought would be sufficient: CONSTRUCT{ ?film wdt:P31 wd:Q11424 . ?film rdfs:label ?filmLabel. } WHERE{ …
Median Hilal
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Embedded blazegraph vs orientdb?

We are looking for a embedded graph database that can run withing application scope. I have tried a proof of concept with OrientDB and blazegraph by integrating jar files within application. I'm not sure which one to pick for my application. Can…
Rahul Kola
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How to use OR in wikidata rdf Graph services

I took the example of finding Genshis Khan's children. How can I tell the graph to travel either P40 or P10. I would like the graph to be able to travel 2 types of LinkType #Children of Genghis Khan #defaultView:Graph PREFIX gas:…
Loredra L
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Error loading wikidata on local blazegraph

I have installed locally wikidata and blazegraph following the instruction here : https://github.com/wikimedia/wikidata-query-rdf/blob/master/docs/getting-started.md The .munge get me 424 files as "wikidump-000000001.ttl.gz" in data/split When I…
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