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What is a cluster? What is High Availability and Fail over?
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Answer Posted / supreet yadav
WebLogic Server instances in a cluster detect failures of
their peer server instances by monitoring:
* Socket connections to a peer server
* Regular server heartbeat messages
In clusters that utilize Web servers with WebLogic proxy
plug-ins, the proxy plug-in handles failover transparently
to the client. If a server fails, the plug-in locates the
replicated HTTP session state on a secondary server and
redirects the client's request accordingly.
For clusters that use a supported hardware load balancing
solution, the load balancing hardware simply redirects
client requests to any available server in the WebLogic
Server cluster. The cluster itself obtains the replica of
the client's HTTP session state from a secondary server in
the cluster.
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