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Understanding Stateless vs Stateful Architectures
- In a stateful architecture, the server stores session data, such as login status or shopping cart contents, tying the client to a specific server.
- To address the issues of stateful architectures, stateless architectures use tokens for authentication instead of storing state on servers.
- In stateless architectures, each client request must contain all necessary information for independent processing by the server.
- Advantages of stateless architectures include increased scalability, as any server can handle requests, and reduced dependency on specific servers.
- On the other hand, stateful architectures maintain client session data between requests, relying on previous interactions.
- Functions can also be categorized as stateful or stateless depending on their independence from external variables.
- Examples of stateless architectures include REST APIs, where each request carries its state, while common stateful examples include database connections.
- In real-world applications, session keys are often used to maintain user sessions, stored in in-memory databases like Redis for efficient access by all servers.
- Both stateful and stateless approaches have pros and cons, with stateful architectures requiring additional infrastructure and management for session data.
- The decision to use stateful or stateless architecture depends on factors like scalability, flexibility, performance, and maintenance needs of the application.
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