{"id":22213229,"url":"https://github.com/benhid/nora","last_synced_at":"2026-05-16T06:38:23.727Z","repository":{"id":71610486,"uuid":"586866628","full_name":"benhid/nora","owner":"benhid","description":"Spark-based OWL reasoner","archived":false,"fork":false,"pushed_at":"2024-06-06T05:54:57.000Z","size":298,"stargazers_count":1,"open_issues_count":1,"forks_count":1,"subscribers_count":1,"default_branch":"main","last_synced_at":"2025-09-04T22:40:54.920Z","etag":null,"topics":["apache-spark","nosql","owl-reasoner","owlapi"],"latest_commit_sha":null,"homepage":"http://benhid.com/nora/","language":"Java","has_issues":true,"has_wiki":null,"has_pages":null,"mirror_url":null,"source_name":null,"license":"mit","status":null,"scm":"git","pull_requests_enabled":true,"icon_url":"https://github.com/benhid.png","metadata":{"files":{"readme":"README.md","changelog":null,"contributing":null,"funding":null,"license":"LICENSE","code_of_conduct":null,"threat_model":null,"audit":null,"citation":"CITATION.cff","codeowners":null,"security":null,"support":null,"governance":null,"roadmap":null,"authors":null,"dei":null,"publiccode":null,"codemeta":null,"zenodo":null}},"created_at":"2023-01-09T12:21:09.000Z","updated_at":"2024-06-06T05:57:58.000Z","dependencies_parsed_at":"2024-06-06T07:06:01.336Z","dependency_job_id":"eb23914a-5e73-4850-a6fb-8a473d8de2fc","html_url":"https://github.com/benhid/nora","commit_stats":null,"previous_names":[],"tags_count":1,"template":false,"template_full_name":null,"purl":"pkg:github/benhid/nora","repository_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/benhid%2Fnora","tags_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/benhid%2Fnora/tags","releases_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/benhid%2Fnora/releases","manifests_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/benhid%2Fnora/manifests","owner_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners/benhid","download_url":"https://codeload.github.com/benhid/nora/tar.gz/refs/heads/main","sbom_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories/benhid%2Fnora/sbom","scorecard":null,"host":{"name":"GitHub","url":"https://github.com","kind":"github","repositories_count":286080680,"owners_count":33092839,"icon_url":"https://github.com/github.png","version":null,"created_at":"2022-05-30T11:31:42.601Z","updated_at":"2026-05-16T04:41:52.686Z","status":"ssl_error","status_checked_at":"2026-05-16T04:41:52.009Z","response_time":115,"last_error":"SSL_connect returned=1 errno=0 peeraddr=140.82.121.5:443 state=error: unexpected eof while reading","robots_txt_status":"success","robots_txt_updated_at":"2025-07-24T06:49:26.215Z","robots_txt_url":"https://github.com/robots.txt","online":false,"can_crawl_api":true,"host_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub","repositories_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repositories","repository_names_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/repository_names","owners_url":"https://repos.ecosyste.ms/api/v1/hosts/GitHub/owners"}},"keywords":["apache-spark","nosql","owl-reasoner","owlapi"],"created_at":"2024-12-02T21:09:07.254Z","updated_at":"2026-05-16T06:38:23.711Z","avatar_url":"https://github.com/benhid.png","language":"Java","funding_links":[],"categories":[],"sub_categories":[],"readme":"# NORA: Scalable OWL reasoner based on NoSQL databases and Apache Spark\n\n[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](LICENSE)\n\nTested with [OpenJDK 11](https://docs.aws.amazon.com/corretto/latest/corretto-11-ug/generic-linux-install.html) and Gradle 7.5.1.\n\nCite us:\n\u003e _Benítez-Hidalgo A, Navas-Delgado I, Roldán-García MM. NORA: Scalable OWL reasoner based on NoSQL databases and Apache Spark. Softw Pract Exper. 2023; 53(12): 2377–2392. doi: 10.1002/spe.3258_\n\n## Building the project\n\nUse `gradle` to build the project:\n\n```bash\n$ make build\n```\n\n## Getting started\n\nBefore running the project, edit the [`config.properties`](config.properties) and set your own values. Make sure to set the `NORA_CONFIG` environment variable to the path of the `config.properties` file:\n\n```bash\n$ export NORA_CONFIG=$(pwd)/config.properties\n```\n\nLoad the ontology into the database:\n\n```bash\n$ java -cp nora.jar loader.Loader examples/ontology.owl examples/individuals/ http://w3id.org/examples/ontology.owl\n```\n\nThen, start the reasoning process by running the following command:\n\n```bash\n$ java -cp nora.jar reasoner.Reasoner\n```\n\nor by using `spark-submit`:\n\n```bash\n$ spark-submit \\\n    --name nora \\\n    --class reasoner.Reasoner \\\n    --master spark://host:port \\\n    --driver-memory 6G \\\n    --executor-memory 120G \\\n    file:///home/user/nora.jar 10\n```\n\nA step-by-step guide is available [here](GETTING_STARTED.md).\n\n## Troubleshooting\n\n#### Exception `java.lang.OutOfMemoryError: Java heap space` when running Apache Spark in client mode\n\nThe flag `-Xmx` specifies the maximum memory allocation pool for a Java Virtual Machine (JVM), while `-Xms` specifies the initial memory allocation pool. These flags can be set to modify the Java memory settings:\n\n- IntelliJ IDEA: Run/Debug configuration \u003e Set VM options to `-Xms10g -Xmx80g`\n- Terminal: Run Java with `-Xms10g -Xmx80g`\n\n## Tests\n\nRun the following command to run the tests:\n\n```console\n$ make test\n```\n\nEmbedded Cassandra requires JDK 11 or lower. If using a higher version, downgrade it to JDK 11.\n\n## License\n\nThis project is licensed under the MIT license - see the [LICENSE](LICENSE) file for details.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbenhid%2Fnora","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fbenhid%2Fnora","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fbenhid%2Fnora/lists"}