A load balancer performs an operation on a predefined parameter, such as the IP address, HTTP cookie, or URL, when a new connection is made so that another connection with the same parameter will always reach the same server.
Which load-balancing predictor does this statement describe?
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The load balancer mentioned in the question performs an operation on a predefined parameter, such as IP address, HTTP cookie, or URL, to ensure that another connection with the same parameter is always directed to the same server. This is a description of load balancing based on hashing, also known as "IP hashing."
Hash-based load balancing uses a hash function to map the predefined parameter, such as the client IP address, to a specific server. The hash function generates a fixed-length hash value for each incoming request, and the load balancer uses this value to determine which server should handle the request. By using a hash function, the load balancer ensures that requests from the same client are always directed to the same server, which is useful for maintaining session persistence.
Round robin load balancing distributes traffic evenly across multiple servers in a rotating manner, whereas least-connections load balancing sends traffic to the server with the fewest active connections. Both of these methods do not take into account any specific parameter of the connection.
Least-loaded load balancing distributes traffic to the server with the least amount of work, based on metrics such as CPU or memory usage. This method is not mentioned in the question, but is similar to least-connections in the sense that both methods dynamically assign traffic to servers based on current conditions.
In summary, the load balancing predictor described in the question is hashing or IP hashing, which maps incoming connections based on a predefined parameter to a specific server.