What is Data Contract, is it a hype?

Understand the concepts of data contracts and how it improves data reliability


Jatin Solanki

March 24, 2023

In today's digital era, data is one of the most valuable assets for businesses and organizations. To effectively manage and exchange this data, it's crucial to establish clear and consistent agreements between parties. That's where Data Contract come into play.

A Data Contract is a formal agreement between two parties that defines the structure and format of data being exchanged. It's a blueprint for the data and ensures that both parties understand the meaning and content of the data they're sending and receiving. By using Data Contract, businesses can avoid misunderstandings, increase efficiency, and minimize the risk of errors in their data exchange processes.

So, whether you're a software developer, business analyst, or just someone who wants to understand the basics of Data Contract, this blog will provide a comprehensive overview of what they are, why they're important, and who is responsible for them. Let’s find out more about data contracts and the key role they play in today’s blog!

What is a data contract?

A data contract defines and enforces the schema and meaning of data produced by a service, allowing data consumers to trust and understand the information. A data contract acts like an API, permitting the flow of information between apps in a visible and versionable way.

Imagine a scenario where a client application wants to retrieve data from a web service. The client application and the web service need to agree on the structure and format of the data being exchanged to ensure seamless communication. This is where a data contract comes into play.

The data contract, in this case, defines the structure of the data that the web service will send to the client and the structure that the client will send to the web service. It could include details such as the data types, names, and order of the data being exchanged.

[DataContract] public class Customer { [DataMember] public string FirstName; [DataMember] public string LastName; [DataMember] public string Email; }

In this example, the data contract defines that the data being exchanged between the client and the web service will contain information about a customer, including their first name, last name, and email address. This data contract ensures that both the client and the web service understand the structure of the data being exchanged, leading to seamless communication.

Why is data contract important?

Data Contracts are important for several reasons:

  • Interoperability: Data Contracts provide a standard way of representing data in a format that can be understood by different systems, enabling interoperability between applications and services written in different programming languages and running on different platforms.
  • Versioning: Data Contracts allow for the versioning of data, making it possible to evolve data structures over time while still maintaining compatibility with previous versions. This is particularly useful in the context of distributed systems, where data is exchanged between different components.
  • Validation: Data Contracts allow for the definition of validation rules that can be applied to incoming data to ensure that it is valid and conforms to the expected structure and format. This helps to ensure data integrity and reduces the likelihood of errors or unexpected behavior.
  • Service-Oriented Architecture (SOA): Data Contracts are a key aspect of Service-Oriented Architecture (SOA) and are used to define the format of messages exchanged between services. By using Data Contracts, services can be loosely coupled and easily composed, enabling flexible and scalable solutions.
  • Increased efficiency: Data Contracts allow for efficient serialization and deserialization of data, reducing the overhead associated with transforming data between different formats and improving overall performance.

In summary, Data Contracts provide a standard, flexible, and efficient way of representing and exchanging data between systems, enabling interoperability, versioning, validation, and efficient data exchange in the context of Service-Oriented Architecture (SOA).

Who is responsible for implementing Data Contract?

The responsibility for implementing Data Contracts is shared between the data engineers, architect and the consumers. Data engineers are responsible for defining the contracts and ensuring that the data being exchanged between different parts of the system adheres to the contracts. Architects, on the other hand, are responsible for ensuring that the contracts align with the overall architecture of the system and that they meet non-functional requirements such as performance, security, and scalability.

Additionally, the project manager or team leader may have an oversight role to ensure that the contracts are properly defined and implemented, and that they support the goals of the project. In some cases, a dedicated data specialist or data architect may also be involved in defining and implementing the Data Contracts.

Overall, the responsibility for Data Contracts ultimately lies with the entire data engineering team and the stakeholders, who need to ensure that the contracts are properly defined, implemented, and maintained throughout the development process.

Data contracts play a crucial role in avoiding downstream data quality issues, protecting against unforeseen schema changes, and ensuring the accuracy of data. Data engineers are typically responsible for data contracts, but it's important to prioritize the needs of the data consumers and gather their requirements before drafting a contract.

Data contracts should be implemented in pipelines where data reliability is critical, and you have the capability to compile requirements and create a solution. However, data contracts alone can't prevent all data incidents, which is why data observability is also crucial in ensuring data dependability.

Here's a step-by-step guide for implementing data contract in your organization:

  • Define data consumer requirements: The first step is to understand the needs of the data consumers. This includes identifying the types of data they need, the format they want it in, and any constraints they may have.
  • Model data: Based on the requirements defined create a data model that outlines the schema and meaning of the data. This will serve as the blueprint for the data contract.
  • Choose an IDL: Choose a templated interactive data language (IDL) like Apache Avro or JSON to create the actual data contract. This will ensure that the data contract is visible and versionable.
  • Decouple data architecture: To avoid using production data or change data capture (CDC) events directly, consider implementing a mechanism for decoupling the data architecture. This will ensure that changes to the data architecture do not affect data pipelines.
  • Define data contract: Based on the data model and the IDL, define the data contract. This will include the schema, structure, and any limitations and semantic implications.
  • Enforce data contract: Make sure that the data contract is enforced across the organization. This will ensure that data is produced and consumed in a consistent and reliable manner.
  • Assign responsibility: Assign responsibility for data contracts and data quality to the data producer. This will ensure that the data is accurate and the data contract is upheld.
  • Regular review: Regularly review the data contract to ensure that it continues to meet the needs of the data consumers and to identify any areas for improvement.
  • Implement data observability: Implement a data observability system to monitor data quality and resolve any incidents in real time. This will complement the data contract and ensure that the organization's data is dependable.
  • Continuously improve: Continuously monitor and improve the data contract and data observability system to ensure that the organization's data is used responsibly and compliantly.

By following these steps, organizations can successfully implement data contracts and ensure the quality and reliability of their data.
The concept of data contracts is not just hype. It's becoming increasingly important for organizations to have clear agreements in place for responsible data usage. As a leader, it's essential to educate yourself on data contracts and their key components to ensure your organization uses data responsibly.
So instead of only asking if companies are data-driven, ask them if they’re data-contract-driven

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