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This is the full User Guide for the Lens Writer, it contains an in-depth set of instructions to fully set up, configure, and run the Writer so you can start writing data as part of an end-to-end system. For a guide to get the Writer up and running in the quickest and simplest possible way, see the Quick Start Guide. Once deployed, you can utilise any of our ready-made sample output NQaud files to test your Writer. For a list of what has changed since the last release, visit the User Release Notes.

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Table of Contents

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• To use a local URL for directories and files, both the format of file:///var/local/data-lens-output/ and /var/local/data-lens-output/ are supported.

• To use a remote http(s) URL for files, https://example.com/input-rdf-file.nq is supported.

• To use a remote AWS S3 URL for directories and files, s3://example/folder/ is supported where the format is s3://<bucket-name>/<directory>/<file-name>. If you are using an S3 bucket for any directory, you must specify an AWS access key and secret key.

Also included in the Writer, is the ability to delete your source NQuad input files after they have been ingested into your Triple Store. This is done by setting the DELETE_SOURCE config value to true. Enabling this means that your S3 Bucket or local file store, will not continuously fill up with RDF NQuad data generated from your Lenses.

Endpoint

First, the easiest way to ingest an RDF file into the Lens Writer is to use the built-in APIs. Using the process GET endpoint, you can specify the URL of an RDF file to ingest, and in return, you will be provided with the success status of the operation.

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