Apigee vs Envoy: Architectural & Scaling Comparison (API Gateway and Service Mesh Runtimes)

In-depth engineering comparison between Apigee and Envoy for backend teams covering runtime architecture, scalability, latency, and cost.

Apigee vs Envoy: Technical Architecture & Performance Comparison

Overview: Apigee vs Envoy

Apigee and Envoy are both powerful tools in the realm of API management and service mesh runtimes, but they serve different purposes and have distinct architectural designs. Apigee is a comprehensive API management platform, while Envoy is a high-performance service proxy designed for modern, microservices-based architectures. Understanding the differences between these two is crucial for making informed decisions about which tool to use in various scenarios.

Architecture, Storage & Execution Models

Apigee

• Architecture: Apigee is a managed service that provides a complete API management platform. It includes features such as API proxy creation, security, analytics, and developer portal management. Apigee’s architecture is designed to be highly scalable and resilient, with a focus on ease of use and integration with other Google Cloud services.
• Storage: Apigee uses a distributed storage system to manage API configurations, policies, and analytics data. This storage is managed by Google Cloud, ensuring high availability and durability.
• Execution Model: Apigee’s execution model is based on a pipeline of policies that are applied to API requests and responses. These policies can be used to enforce security, rate limiting, transformation, and other business logic. Apigee’s policies are declarative and can be configured through a web interface or API.

Envoy

• Architecture: Envoy is a service proxy that is designed to be deployed alongside each microservice in a service mesh. It is a high-performance, edge and service-to-service proxy that can handle a wide range of network protocols. Envoy is often used in conjunction with a service mesh control plane like Istio.
• Storage: Envoy itself does not have a dedicated storage system. Configuration and state are typically managed by the control plane (e.g., Istio) and can be stored in a variety of backends such as etcd, Kubernetes ConfigMaps, or custom solutions.
• Execution Model: Envoy’s execution model is based on a modular filter chain architecture. Filters can be dynamically loaded and configured to handle various aspects of request and response processing, including routing, load balancing, and security. Envoy’s filter chain is highly extensible and can be customized to meet specific requirements.

Latency, Scalability & Resource Utilization Benchmarks

Apigee

• Latency: Apigee’s latency can vary depending on the complexity of the policies applied and the network conditions. Generally, Apigee is designed to handle high throughput with low latency, but the addition of complex policies can introduce some overhead.
• Scalability: Apigee is highly scalable and can handle large volumes of API traffic. It leverages Google Cloud’s infrastructure to automatically scale resources as needed.
• Resource Utilization: Apigee’s resource utilization is managed by Google Cloud, which ensures efficient use of compute, memory, and network resources. However, the cost can increase with the volume of traffic and the complexity of policies.

Envoy

• Latency: Envoy is known for its low latency and high performance. It is designed to be a lightweight proxy that can handle a high volume of requests with minimal overhead. Benchmarks have shown that Envoy can achieve sub-millisecond latencies in many scenarios.
• Scalability: Envoy is highly scalable and can be deployed in large, distributed environments. It can handle thousands of services and millions of requests per second. Envoy’s scalability is often enhanced by the use of a service mesh control plane like Istio.
• Resource Utilization: Envoy is optimized for resource efficiency. It uses a small amount of memory and CPU resources, making it suitable for deployment in resource-constrained environments. However, the resource utilization can increase with the number of filters and the complexity of configurations.

Developer Experience, Self-Hosting & Operational Cost Analysis

Apigee

• Developer Experience: Apigee provides a rich, web-based interface for managing APIs, creating policies, and monitoring performance. It also offers a comprehensive set of APIs for programmatic management. The developer experience is generally positive, with a focus on ease of use and integration.
• Self-Hosting: Apigee can be self-hosted, but it is primarily designed as a managed service. Self-hosting requires significant effort and expertise to set up and maintain, including managing the underlying infrastructure and ensuring high availability.
• Operational Cost: The cost of using Apigee can be high, especially for large-scale deployments. The pricing model is based on the number of API calls and the complexity of policies. However, the managed service aspect can reduce the operational burden and provide a more predictable cost structure.

Envoy

• Developer Experience: Envoy has a steeper learning curve compared to Apigee. It requires a deeper understanding of network protocols and service mesh concepts. However, once configured, Envoy provides a powerful and flexible tool for managing microservices. The developer experience is enhanced by the availability of extensive documentation and community support.
• Self-Hosting: Envoy is designed to be self-hosted and can be deployed in a variety of environments, including on-premises, cloud, and hybrid setups. Self-hosting provides full control over the infrastructure and can be more cost-effective for certain use cases.
• Operational Cost: The cost of using Envoy is primarily associated with the infrastructure and resources required to run it. While the initial setup and maintenance can be resource-intensive, the long-term operational cost can be lower, especially for large-scale, microservices-based architectures.

Detailed Feature Comparison

Concrete Engineering Verdict

When to Choose Apigee

• Comprehensive API Management: If your organization requires a complete API management platform with features such as API proxy creation, security, analytics, and developer portal management, Apigee is the better choice.
• Managed Service: If you prefer a managed service that reduces the operational burden and provides a predictable cost structure, Apigee is ideal.
• Google Cloud Integration: If you are already using Google Cloud services and want a tightly integrated solution, Apigee is a natural fit.

When to Choose Envoy

• Microservices Architecture: If your organization is building a microservices-based architecture and requires a high-performance, lightweight service proxy, Envoy is the better choice.
• Customization and Control: If you need a highly customizable and extensible solution that can be tailored to your specific requirements, Envoy is the way to go.
• Self-Hosting and Cost Efficiency: If you prefer to self-host your infrastructure and are looking for a cost-effective solution, Envoy is a strong candidate.

In summary, Apigee is a comprehensive, managed API management platform that is ideal for organizations requiring a complete solution with minimal operational overhead. Envoy, on the other hand, is a high-performance, self-hosted service proxy that is well-suited for modern, microservices-based architectures that require flexibility and customization.