Contents
What is session persistence session?
Session Persistence (sometimes called sticky sessions) involves directing a user’s requests to one application or backend web server for the duration of a “session.” The session is the time it takes a user to complete a transaction or task that might include multiple requests.
How do web server sessions work?
Websites use a session ID to respond to user interactions during a web session. To track sessions, a web session ID is stored in a visitor’s browser. This session ID is passed along with any HTTP requests that the visitor makes while on the site (e.g., clicking a link).
What is Web service persistence?
Web service persistence is used by the following advanced features to support long running requests and to survive server restarts: Asynchronous Web service invocation using asynchronous client transport or MakeConnection. Web services reliable messaging.
Why sticky session is bad?
There are two main downsides: Your load isn’t evenly distributed. Sticky sessions will stick, hence the name. While initial requests will be distributed evenly, you might end up with a significant number of users spending more time than others.
How does session persistence work in a server?
In this case, session persistence makes it much easier for transactions to complete successfully. A load balancer or application delivery controller (ADC) sits in front of the server group and implements the logic that ties a user session to a specific server for as long as necessary.
When to invalidate a session on a server?
The session.invalidate()method, which is often used to log out a user, only invalidates the current session for a user—the user’s authentication information still remains valid and is stored in the context of the server or virtual host.
How to retain session persistence in WebLogic Server?
In a previous WebLogic Server release, a change was introduced to the SessionID format that caused some load balancers to lose the ability to retain session stickiness. A server startup flag, -Dweblogic.servlet.useExtendedSessionFormat=true, retains the information that the load-balancing application needs for session stickiness.
What happens when doing session persistence in load balancer?
Which means that when doing session persistence in a load balancer, the following happens: the first user’s request comes in without session persistence information the request bypass the session persistence server choice since it has no session persistence information