Server Architecture Types Quiz
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Questions and Answers

What is a disadvantage of using blocking I/O?

  • It may cause delays while waiting for data. (correct)
  • It can handle many concurrent clients easily.
  • It requires complex event-driven design.
  • It efficiently supports long-lived connections.

    • Which architecture is known for higher fault tolerance?

  • Multi-threaded architectures
  • Multi-process architectures (correct)
  • Single-threaded architectures
  • Event-driven architectures

    • What is a characteristic of event-driven architectures?

  • They perform well for I/O-bound tasks. (correct)
  • They are simpler to implement than multi-threaded models.
  • They excel in compute-intensive tasks.
  • They reduce resource consumption significantly.

    • Which of the following statements is true regarding scalability?

    <p>Multi-threaded architectures add complexity but handle more clients. (A)</p> Signup and view all the answers

    Which of the following situations would most likely benefit from a multi-threaded architecture?

    <p>Handling compute-intensive tasks efficiently. (B)</p> Signup and view all the answers

    What is a significant disadvantage of the Frontend + One Worker Process per Client architecture?

    <p>High memory usage limits scalability. (D)</p> Signup and view all the answers

    Which of the following is a characteristic of the Single-Threaded Event-Driven Server?

    <p>Requires non-blocking I/O operations. (C)</p> Signup and view all the answers

    What makes the Multi-Process Multi-Threaded Server with Frontend design robust?

    <p>Worker crashes are limited to individual processes. (B)</p> Signup and view all the answers

    What is a primary use case for the Multi-Process Multi-Threaded Server with Coordinator?

    <p>Systems requiring fault tolerance and decentralized control. (A)</p> Signup and view all the answers

    Which server architecture is most efficient for lightweight tasks?

    <p>Single-Threaded Event-Driven Server. (C)</p> Signup and view all the answers

    What is a common drawback of the Frontend + One Worker Thread per Client architecture?

    <p>Bottlenecks due to shared resources. (B)</p> Signup and view all the answers

    What requirement must be met for the Multi-Process Event-Driven Server with Coordinator to function?

    <p>Non-blocking I/O operations. (C)</p> Signup and view all the answers

    Which server architecture may become a bottleneck under high load?

    <p>Multi-Process Multi-Threaded Server with Frontend. (D)</p> Signup and view all the answers

    Flashcards

    Worker crashes impact

    Worker crashes have a limited impact on the application in high-concurrency systems.

    Blocking I/O

    Blocking I/O is simple but can delay the application when awaiting data.

    Event-driven architecture

    Event-driven architectures are good for I/O-bound tasks.

    Scalability (concurrency)

    Multi-threaded and event-driven designs handle more concurrent clients.

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    Fault tolerance (architectures)

    Multi-process architectures are more resilient to failures.

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    Frontend + One Worker Process per Client

    A server architecture that creates a new process for each client connection.

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    Frontend + One Worker Thread per Client

    A server architecture using threads to handle client connections, one thread per client.

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    Single-Threaded Event-Driven Server

    A server model where one thread manages all client connections using an event-driven approach, focusing on non-blocking I/O.

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    Multi-Process Multi-Threaded Server (Frontend)

    A server design with a frontend accepting connections and sending them to multi-threaded worker processes. Handles client connections using multiple processes and threads.

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    Multi-Process Multi-Threaded Server (Coordinator)

    A server model where worker processes (or threads) handle client interactions, and a coordinator handles privileged actions and management.

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    Multi-Process Event-Driven Server with Coordinator

    A highly scalable server using event-driven processes and a coordinator for special tasks, needing non-blocking I/O.

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    Scalability Limitations (Processes)

    Server architecture using a new process for every client connection can have limitations if memory usage is high, making adding more clients difficult.

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    Server Crash Impact (Frontend and Threads)

    A crash of a thread in a worker process using threads will impact all clients connected to the server. A process crash only affects its clients.

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    Study Notes

    Server Architecture Types

    • Frontend + One Worker Process per Client:

      • A new process is created for each client connection.
      • Simple implementation, but scalability limited by memory usage.
      • Worker process crashes only affect one client.
      • Suitable for servers with few clients (e.g., SSH).

    • Frontend + One Worker Thread per Client:

      • A new thread is created per client connection.
      • Faster response, lower memory use compared to process-based approach.
      • Thread crashes affect all clients.
      • Potential issues with shared resources (e.g., file descriptors).
      • Suitable for moderate client loads with acceptable blocking I/O.

    • Single-Threaded Event-Driven Server:

      • A single thread handles all clients using an event-driven model.
      • Requires non-blocking I/O operations.
      • Efficient for I/O-bound servers (low resource use).
      • Complex to implement, does not leverage multi-core processors.
      • Server crash affects all clients.
      • Suitable for serving static webpages or lightweight tasks.

    • Multi-Process Multi-Threaded Server with Frontend:

      • Frontend accepts connections, delegates to multi-threaded worker processes.
      • Combines multi-process and multi-thread advantages.
      • Worker crashes have limited impact.
      • Frontend can become a bottleneck under heavy loads.
      • Suitable for scalable, robust applications needing concurrency.

    • Multi-Process Multi-Threaded Server with Coordinator:

      • Worker processes/threads handle client requests, coordinator for privileged operations.
      • Distributes load, isolates worker crashes.
      • Reduced communication bottlenecks.
      • Needs efficient kernel load balancing.
      • Potential scalability limits due to memory consumption.
      • Suitable for fault-tolerant systems with decentralized control.

    • Multi-Process Event-Driven Server with Coordinator:

      • Uses event-driven workers, coordinator for privileged tasks.
      • Requires non-blocking I/O.
      • Highly scalable, isolates worker crashes for increased robustness.
      • Efficient for high concurrency and short-lived connections.
      • Complex implementation.

    Key Considerations

    • Blocking vs. Non-Blocking I/O:

      • Blocking I/O is simpler but can delay responses.
      • Non-blocking I/O avoids delays but requires event-driven design.

    • Scalability:

      • Multi-threaded and event-driven handle more clients but are more complex.
      • Multi-process architectures are robust but take more resources.

    • Fault Tolerance:

      • Multi-process architectures are more resilient due to isolated processes.
      • Multi-threaded or single-threaded architectures are less resilient.

    • Performance:

      • Event-driven architectures excel with I/O-bound tasks.
      • Multi-threaded and multi-process better suit compute-intensive tasks.

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    Description

    Test your knowledge on different server architecture types, including frontend with worker processes and threads. Learn about the advantages and limitations of each approach in handling client connections. This quiz is perfect for understanding server scalability and performance.

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