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XScholar - Abstract Search

A simple Vespa application which can be deployed on four nodes within a Spin application for text search on a database of research paper abstracts.

Spin Setup

For this stack we will need 4 servies:

  • db-admin0: Vespa admin node
  • db-stateless0: Vespa search/feed node
  • db-content0: Vespa content node.
  • app-linux: Service for data transfer

app-linux configuration

Set up this node to use the docker image at registry.nersc.gov/m3624/app-linux:<MOST RECENT TAG>. This image is a basic linux image with tools you might need, including git, curl, vim, etc. Create a new NFS volume and name it db-xscholar (e.g. new peristant volume). Mount it as:

  • /nfs to data

Mount a CFS directory you want to use as a data transfer directory at /cfs and leave the sub-path in the volume empty. Ensure that the "read-only" box is checked. There is no need to configure any other parameters for this service.

db-admin0 configuration

Set up this node to use the docker image at registry.nersc.gov/m3624/xscholar-vespa:<LATEST TAG>. Under "Show advanced options > Networking", set the container's hostname to db-admin0. Set the VESPA_CONFIGSERVERS environment variable to the hostname of this service you just set, e.g. db-admin0. Make sure the "entrypoint" and "command" parameters under "Command" are empty. This will start both configserver and services on this node. Add the NFS volume you created during the db-admin0 configuration under "Volumes" and mount it at three directories:

  • /opt/vespa/var to admin0/vespa/var
  • /opt/vespa/logs to admin0/vespa/logs
  • /nfs to data

This configuration will attempt to automatically load data from /nfs/feed-file.json on startup.

db-stateless0 configuration

Set up this node to use the docker image at vespaengine/vespa. Under "Show advanced options > Networking", set the container's hostname to db-stateless0. Set the VESPA_CONFIGSERVERS environment variable to the hostname of the db-admin service you previously configured, e.g. db-admin0. Make sure the "entrypoint" parameter under "Command" is empty, but set the "command" parameter as services. This will start services on this node. Add the NFS volume you created during the db-admin0 configuration under "Volumes" and mount it at two directories:

  • /opt/vespa/var to stateless0/vespa/var
  • /opt/vespa/logs to stateless0/vespa/logs

db-content0 configuration

Set this node up Set up this node to use the docker image at vespaengine/vespa. Under "Show advanced options > Networking", set the container's hostname to db-content0. Set the VESPA_CONFIGSERVERS environment variable to the hostname of the db-admin service you previously configured, e.g. db-admin0'. Make sure the "entrypoint" parameter under "Command" is empty, but set the "command" parameter as services`. This will start services on this node.

  • /opt/vespa/var to content0/vespa/var
  • /opt/vespa/logs to content0/vespa/logs

Note on adding content nodes:

For redundency/performance you can increase the number of content nodes (e.g. db-content1, db-content2, ...) See Vespa docs to determine the setup you need. If you add more content nodes, modify hosts.xml and services.xml accordingly.

Starting up the Vespa cluster

The Vespa application should automatically deploy. You can verify the service is working by querying the db-stateless0 node for the application's status.

$ curl --head http://db-stateless0:8080/ApplicationStatus

If your application is properly configured, you should recieve a 200 OK response.

Feeding data to Vespa

The db-admin0 node setup automatically tries to feed data from the NFS directory via "feed-file.json". You can manually feed data to your new Vespa DB though the feeding API. Create a json file in which each line is a document to be fed into the database. See examples/data/feed-file.json for an example feed file. Copy this feed file to your transfer directory on the NERSC community file system, and use the app-linux node to copy it to the NFS data directory. On the db-stateless0 node, run the following:

$ java -jar /opt/vespa/lib/jars/vespa-http-client-jar-with-dependencies.jar \
    --file nfs/feed-file.json --endpoint http://db-stateless0:8080 --verbose --useCompression

Query the database

On any node in your cluster, run the following:

$ curl -H "Content-Type: application/json" --data '{"yql" : "select * from sources * where default contains \"thermoelectric materials\";"}' http://db-stateless0:8080/search/