What is the primary purpose of load balancing in web applications?
- Distribute incoming traffic
- Enhance security
- Execute database queries
- Store session data
The primary purpose of load balancing in web applications is to distribute incoming traffic across multiple servers, ensuring better performance and preventing overload on a single server.
How can an HTTP servlet differentiate between GET and POST requests?
- Checking the request type in the doGet and doPost methods.
- The HTTP servlet cannot differentiate between GET and POST requests.
- Using the HttpServletRequest method getMethod()
- Using the requestType attribute in the web.xml file.
An HTTP servlet can differentiate between GET and POST requests by using the HttpServletRequest method getMethod(), which returns the HTTP method of the request (e.g., "GET" or "POST"). This allows the servlet to determine the type of request being made.
Which strategy involves adding more servers to handle increased load in a web application?
- Horizontal scaling
- Load balancing
- Session management
- Vertical scaling
Horizontal scaling involves adding more servers to handle increased load in a web application by distributing the load across multiple machines.
To avoid thread safety issues, it's recommended to use __________ instead of instance variables in servlets.
- final variables
- global variables
- local variables
- static variables
Using static variables is recommended in servlets to avoid thread safety issues, as they are shared among all instances of the servlet and are stored in a shared memory space.
The _________ method should be used carefully in servlets due to potential thread safety issues.
- destroy()
- doGet()
- init()
- service()
The service() method should be used carefully in servlets due to potential thread safety issues. It handles requests and might result in multiple threads accessing the servlet concurrently, requiring careful consideration for thread safety.
A thread-safe servlet ensures that shared data is accessed in a _________ manner.
- parallel
- random
- sequential
- synchronized
A thread-safe servlet ensures that shared data is accessed in a synchronized manner. This prevents multiple threads from accessing the shared data simultaneously, reducing the risk of data corruption and ensuring proper thread safety.
In HTTP servlets, the _________ method is used to send error responses back to the client.
- doError()
- errorResponse()
- handleError()
- sendError()
The sendError() method in HTTP servlets is used to send error responses back to the client, providing information about the encountered error.
What is the basic difference between horizontal scaling and vertical scaling?
- Distributing traffic
- Increasing resources on a server
- Increasing servers
- Load balancing
The basic difference is that horizontal scaling increases the number of servers to handle increased load, while vertical scaling involves increasing the resources (CPU, RAM) on a single server.
Which load balancing algorithm distributes requests based on the server with the least connections?
- Least Connections
- Random
- Round Robin
- Weighted Round Robin
The load balancing algorithm that distributes requests based on the server with the least connections is known as the Least Connections algorithm.
In the context of web applications, what does the term 'sticky session' mean?
- A session that retains client affinity
- A session with a fixed duration
- A session with persistent data
- A session with secure connections
'Sticky session' refers to a session that retains client affinity, meaning requests from the same client are directed to the same server, enhancing user experience in stateful applications.