Remote TopicSpaces Server

Installation and UseJack Park

Latest: 201000405

Description

• Remote Server is an instance of an RDF Store that can be scaled out to multi-platform installations– It is not a secure server

• It must live on a local network not available for direct web access.

• Indirect web access is provided through webservices from web-visible TopicSpaces servers

• Server responds to– SPARQL queries– SERQL queries

Architecture

TopicSpacesFed Server

TopicSpacesFed Server

RemoteTriplestore

Internet Local Net

Installation Big Picture

• Remote Triplestore builds two databases– A Sesame Native database

• Automatic when the Sesame SDK Console is used– A Bigdata TopicSpaces database

• Must be created according to instructions– The Tomcat server is running– Sesame SDK Console is used to create the database

– Requires certain configuration files adjusted per following instructions which are explained at:

• http://sourceforge.net/apps/mediawiki/bigdata/index.php?title=Using_Bigdata_with_the_OpenRDF_Sesame_HTTP_Server

– Our instructions are simpler because most of the work is done already

Installation Steps

• Install RemoteTSServer at INSTALL_HOME somewhere on an off-line server

• Configure triplestore properties• Create a triplestore• Boot tomcat ready to serve• Configure TopicSpaces to use RemoteTSServer

Remote Server INSTALL_HOME

• bin: where Tomcat scripts are found

• conf: where all important configuration files are found

• sesame: used to create the triplestore

• templates: used in the triplestore creation phase

Configure Triplestore Properties• Locate and open for editing:

– INSTALL_HOME/conf/bigdata.properties

• Locate and edit this property:– com.bigdata.journal.AbstractJournal.file=

– That determines where your triplestore will sit on the hard disk (note ‘/’ instead of ‘\’)

• Locate and edit this property:– com.bigdata.rdf.store.AbstractTripleStore.quads=– It must be set to true

• Make a copy of the absolute address of that file, e.g.– c:/RemoteTSserver/conf/bigdata.properties– That will be used in the following steps when it is copied into a console

during creation of the triplestore

Create a Triplestore—1• Use INSTALL_HOME/sesame/openrdf-sesame-2.3.1/bin/console(bat/sh) to boot a console and create a base sesame database on the hard disk in the user’s home directory (different on different operating sytems)– <user_home>/<some directory structure>/Aduna/OpenRDF Sesame console

• Exit the console• Copy INSTALL_HOME/templates (the entire directory

and its content) to the Aduna console directory– That grants sesame a new template to use in the following

steps:• bigdata.ttl

Create a Triplestore—2

• Start Tomcat– INSTALL_HOME/bin/startup(bat/sh)

• Start the sesame console again– This begins the process of:• Connecting sesame to the running tomcat server• Creating a bigdata triplestore

– This relies on information related to the location of the configuration properties edited in a previous step

Create a Triplestore—3

• In the open console, complete these steps:– create bigdata. <enter>– <enter> to default the next step.– When properties are requested, enter the precise

location of the bigdata.properties file from an earlier step, then hit <enter>

– That’s it. The triplestore will be created there the first time it is requested.

• At this time, Tomcat is running and ready to converse with TopicSpaces

Configure TopicSpaces

• Those instructions are included in the TopicSpaces Installation document