Book Image

Architecting Data-Intensive Applications

By : Anuj Kumar
Book Image

Architecting Data-Intensive Applications

By: Anuj Kumar

Overview of this book

<p>Are you an architect or a developer who looks at your own applications gingerly while browsing through Facebook and applauding it silently for its data-intensive, yet ?uent and efficient, behaviour? This book is your gateway to build smart data-intensive systems by incorporating the core data-intensive architectural principles, patterns, and techniques directly into your application architecture.</p> <p>This book starts by taking you through the primary design challenges involved with architecting data-intensive applications. You will learn how to implement data curation and data dissemination, depending on the volume of your data. You will then implement your application architecture one step at a time. You will get to grips with implementing the correct message delivery protocols and creating a data layer that doesn’t fail when running high traffic. This book will show you how you can divide your application into layers, each of which adheres to the single responsibility principle. By the end of this book, you will learn to streamline your thoughts and make the right choice in terms of technologies and architectural principles based on the problem at hand.</p>
Table of Contents (18 chapters)
Title Page
Packt Upsell
Contributors
Preface
Index

Data integrity and validating constraints


Integrity of data begins at the time as the data is being ingested. Stardog provides this capability through two mechanisms: strict RDF Parsing and Integrity-Constraint validation.

Strict parsing of RDF

RDF parsing in Stardog is strict: it requires typed RDF literals to match their explicit datatypes, URIs to be well-formed, and so on. In some cases, strict parsing isn’t ideal, so it's possible to disable strict parsing at database-creation time. Disabling of strict parsing at database-creation time has a limitation. While it will allow invalid data to be ingested, it cannot be re-enabled once the data is in the database; the database must be recreated and the data reloaded.

However, even with strict parsing disabled, Stardog's RDF parser may encounter parse errors from which it cannot recover. And loading data in lax mode may lead to unexpected SPARQL query results. For example, malformed literals ("2.5"^^xsd:int) used in filter evaluation may lead...