11/24/2023 0 Comments My free farm 2 guide![]() ![]() Vendors of hardware‑based solutions load proprietary software onto the machine they provide, which often uses specialized processors. Load balancers typically come in two flavors: hardware‑based and software‑based. In such environments it greatly helps if the load balancer can dynamically add or remove servers from the group without interrupting existing connections. This is common in environments such as the Amazon Web Services (AWS) Elastic Compute Cloud (EC2), which enables users to pay only for the computing capacity they actually use, while at the same time ensuring that capacity scales up in response traffic spikes. Many fast‑changing applications require new servers to be added or taken down on a constant basis. Switching servers would cause that information to be fetched for the second time, creating performance inefficiencies. Another use case for session persistence is when an upstream server stores information requested by a user in its cache to boost performance. ![]() The best load balancers can handle session persistence as needed. In such cases, it is essential that all requests from a client are sent to the same server for the duration of the session. Changing which server receives requests from that client in the middle of the shopping session can cause performance issues or outright transaction failure. For example, in a shopping cart application the items in a user’s cart might be stored at the browser level until the user is ready to purchase them. Information about a user’s session is often stored locally in the browser. The Least Time algorithm, if so configured). One that is selected by then applying the Least Connections algorithm (or for NGINX Plus
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