Hello Fedora Community,
We have concluded the second sprint within the "Beta Phase" of Fedora4
development. The work of this and each sprint comes completely from the
contribution of Fedora stakeholder institutions in allocating developer
time. If you would like to become involved with Fedora4 development, please
send me an email. If you have comments or questions on the work from this
sprint, please send an email or comment directly on the wiki. Finally, the
addition of your descriptive use cases to the wiki [1] is valuable in
informing on-going development.
Below is a link to the Sprint B2 summary (also included in-full in this
email's body):
https://wiki.duraspace.org/x/Y_EQAg
Andrew Woods
================
Development Team
================
Osman Din - Yale University
Yuqing Jiang - University of Prince Edwards Island
Esmé Cowles - University of California, San Diego
Nigel Banks - Discovery Garden
============
Sprint Themes
============
---------------------
1) Triplestore
As a step towards enabling SPARQL-Query over Fedora4 resources, this sprint
formalized the Fedora4 RDF ontology and added an initial framework for
integrating an external triplestore.
The Fedora4 ontologies have been split and published into the following
three namespaces:
- Predicates for internal repository usage (
http://fedora.info/definitions/v4/repository#)
- Predicates for use within the REST-API (
http://fedora.info/definitions/v4/rest-api#)
- Predicates for inter-object relationships (
http://fedora.info/definitions/v4/rels-ext#)
Note: Community review and feedback would be greatly appreciated in regards
to the ontologies listed above.
A new external component has been created that listens for content
creation/modification/deletion events from the repository and then submits
the updated objects to an external triplestore that supports SPARQL-Query.
There is currently support for the Fuseki [2] and Sesame [3] SPARQL servers.
---------------------
2) Large Files
One of the short-comings of Fedora3 has been in the management of
multi-gigabyte datastreams.
This sprint focused on leveraging the underlying repository capability of
creating a projection [4] over a local file-space which contains the large
files.
The experiments revealed that the default filesystem projection experiences
performance bottlenecks when the content is in the multi-gigabyte range.
More information about the large file experiments and follow-on work can be
found on the wiki [5].
---------------------
3) Policy-driven Storage
A goal of Fedora4 is to ease the deployment and configuration of the
application.
One way of accomplishing that goal is to allow Fedora4 to be deployed as a
vanilla application, then provide the option of configuring various
repository features via HTTP calls at runtime.
Along those lines, this sprint incorporated the Policy-driven Storage
prototyping work completed in Sprint B1 into the Fedora codebase.
It is now possible at runtime to define or undefine a policy within the
repository to route content at the time of ingest into one of multiple
backend content stores.
- The initial implementation supports routing based on content mime-type
More information about Fedora's Policy-driven Storage can be found on the
wiki [6].
---------------------
4) Islandora Integration
This sprint included on-going development towards integrating Islandora
with the Fedora4 REST-API.
=========
References
=========
[1] https://wiki.duraspace.org/display/FF/Use+Cases
[2] http://jena.apache.org/documentation/serving_data
[3] http://www.openrdf.org/documentation.jsp
[4] https://docs.jboss.org/author/display/MODE/Federation
[5] https://wiki.duraspace.org/display/FF/Design+-+Large+Files
[6] https://wiki.duraspace.org/display/FF/Design+-+Policy+Driven+Storage
------------------------------------------------------------------------------
Introducing Performance Central, a new site from SourceForge and
AppDynamics. Performance Central is your source for news, insights,
analysis and resources for efficient Application Performance Management.
Visit us today!
http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk
_______________________________________________
Fedora-commons-developers mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/fedora-commons-developers
