What is session replication in WebLogic?

HTTP Session State Replication. Using in-memory replication, WebLogic Server copies a session state from one server instance to another. The primary server creates a primary session state on the server to which the client first connects, and a secondary replica on another WebLogic Server instance in the cluster.

What is session stickiness in WebLogic?

With WebLogic Server, session state is normally maintained on two servers, one primary and one backup. A sticky load balancer will send each user request to the specified primary server, and any local changes to session state will be copied to the backup server.

What is session persistence in WebLogic?

You use session persistence to permanently store data from an HTTP session object to enable failover and load balancing across a cluster of WebLogic Servers. When your applications stores data in an HTTP session object, the data must be serializable.

What is WebLogic in simple terms?

WebLogic Server is an application server: a platform for developing and deploying multitier distributed enterprise applications. WebLogic Server centralizes application services such as Web server functionality, business components, and access to backend enterprise systems.

What is session replication?

Session replication is a mechanism used to replicate the data stored in a session across different instances. However, the replicated instance must be part of the same cluster. When session replication is enabled in a cluster environment, the entire session data is copied on a replicated instance.

What are the issues with sticky session?

Since requests for a user are always routed to the same machine that first served the request for that session, sticky sessions can cause uneven load distribution across servers.

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.

What is a persistent session?

What is Tomcat clustering?

Tomcat clustering is a group of Tomcat instances that are connected. An instance of Tomcat is an independent system. Clustering instances of Tomcat makes them interconnected. Tomcat instances in a Tomcat cluster are often referred to as a node.