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From Apache Wiki <>
Subject [Incubator Wiki] Update of "RyaProposal" by AdinaCrainiceanu
Date Tue, 01 Sep 2015 18:48:38 GMT
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The "RyaProposal" page has been changed by AdinaCrainiceanu:

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= Rya Proposal =

== Abstract ==

Rya (pronounced "ree-ah") is a cloud-based RDF triple store that supports SPARQL queries.

== Proposal ==

Rya is a scalable RDF data management system built on top of Accumulo. Rya uses novel storage
methods, indexing schemes, and query processing techniques that scale to billions of triples
across multiple nodes. Rya provides fast and easy access to the data through SPARQL, a conventional
query mechanism for RDF data.

== Background ==

RDF is a World Wide Web Consortium (W3C) standard used in describing resources on the Web.
The smallest data unit is a triple consisting of subject, predicate, and object. Using this
framework, it is very easy to describe any resource, not just Web related. For example, if
you want to say that Alice is a professor, you can represent this as an RDF triple like (Alice,
rdf:type, Professor). In general, RDF is an open world framework that allows anyone to make
any statement about any resource, which makes it  a popular choice for expressing a large
variety of data. 

RDF is used in conjunction with the Web Ontology Language (OWL). OWL is a framework for describing
models or ontologies for RDF. It defines concepts, relationships, and/or structure of RDF
documents. These models can be used to 'reason/infer' information about entities within a
given domain. For example, you can express that a Professor is a sub class of Faculty, (Professor,
rdfs:subClassOf, Faculty) and knowing that (Alice, rdf:type, Professor), it can be inferred
that (Alice, rdf:type, Faculty). 

SPARQL is an RDF query language. Similar with SQL, SPARQL has SELECT and WHERE clauses; however,
it is based on querying and retrieving RDF triples. 

Work on Rya, a large scale distributed system for  storing and querying RDF data, started
in 2010.

== Rationale ==

With the increase in data size, there is a need for scalable systems for storing and retrieving
RDF data in a cluster of nodes. We believe that Rya can fulfil that role. We expect that communities
within government, health care, finance, and others who generate large amounts of RDF data
will be most interested in this project. 

>From its inception, the project operated with an Apache-style license, but it was open
to mostly US government-related projects only. We believe that having the project and the
development open for all will benefit both the project and the interested communities.

== Current Status ==

The project source code and documentation are currently hosted in a private repository on
Github. New users are added to the repository upon request. 

=== Meritocracy ===

Meritocracy is the model that we currently follow, and we want to build a larger and more
diverse developer community by becoming an Apache project. 

=== Community ===

Rya has being building a community of users and developers for the past 3 years. There is
currently an active workgroup with monthly meetings and the number of participants in the
meeting is increasing.  

=== Core Developers ===

The core developers are a diverse group of people who are either government employees or former
/ current government contractors from different companies. 

=== Alignment ===

Rya is built on top of Accumulo, an Apache project. 

== Known Risks ==

=== Orphaned Products ===

There is a very small risk of becoming orphaned. The current contributors are strongly committed
to the project, there is a large enough number of developers interested in contributing to
the project, and we believe that the support for the project will continue to grow from the
interested communities.

=== Inexperience with Open Source ===

The initial committers have various degrees of experience with open source projects - from
very new to experienced. This project was open source within government from the beginning.
We do not expect to have difficulties in operating under Apache's development process.

=== Homogenous Developers ===

The current list of developers form a heterogeneous group, with people for academia, government,
and industry, collaborating from distributed geographic locations. We aim to expand the list
of contributors with the help of the Apache incubation process. 

=== Reliance on Salaried Developers ===

Many but not all of the developers working on the project are salaried employees, paid to
work on this project. They will continue to contribute to the open source project. Some of
the initial committers continued as volunteers even if no longer employed to work on this
project and they plan to continue supporting the project.  

=== Relationships with Other Apache Products ===

Rya uses Apache Accumulo, Hadoop, Zookeeper, Maven. 

=== Apache Brand ===

Rya has generated interest in the government. It also generated interest within academia and
industry. We believe that everyone could benefit from having Rya as an open source project.
Due to its strong ties to Accumulo, an Apache project, and due to the values of the Apache
Foundation, we believe that Apache incubator is the right place for Rya. 

== Documentation ==

Two peer-reviewed publications [1,2] about Rya were published in 2012 and 2015. More documentation
is available in the code.

[1] Roshan Punnoose, Adina Crainiceanu, David Rapp. Rya: A Scalable RDF Triple Store for the
Clouds. Proceedings of the 1st International Workshop on Cloud Intelligence, Pages 4:1-4:8,
August 2012

[2] Roshan Punnoose, Adina Crainiceanu, David Rapp. SPARQL in the Clouds Using Rya. Information
Systems, Volume 48, Pages 181-195, March 2015 (Available online 23 July 2013)

== Initial Source ==

The code is currently available in a private Github repository.

== Source and Intellectual Property Submission Plan ==

The source code has been released under the Apache License, Version 2. Software grant, CCLA
and ICLAs have been submitted.

== External Dependencies ==

 * Open RDF (BSD license)
 * GeoMesa (Apache License, Version 2.0)
 * Accumulo (Apache License, Version 2.0)
 * Hadoop (Apache License, Version 2.0)
 * TinkerPop (Apache License, Version 2.0)
 * IndexingSail (Apache License, Version 2.0)

== Cryptography ==

The proposal does not involve any cryptographic code.

== Required Resources ==

=== Mailing lists ===


=== Git Repository ===

=== Issue Tracking ===


== Initial Committers ==

 * Roshan Punnoose,
 * David Rapp,
 * Adina Crainiceanu,
 * Aaron Mihalik,
 * Puja Valiyil,
 * Jennifer Brown,
 * Steve Wagner,

== Affiliations ==

 * Roshan Punnoose 
 * David Rapp
 * Adina Crainiceanu, US Naval Academy
 * Aaron Mihalik, Parsons
 * Puja Valiyil, Parsons
 * Jennifer Brown, Parsons
 * Steve Wagner

== Sponsors ==

=== Champion ===

Adam Fuchs, ASF Member,

=== Nominated Mentors ===

=== Sponsoring Entity ===

Apache Incubator


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