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Question :
How does a server know when another server is unavailable?
Category Applet Interview Questions
Rating (0.3) By 7 users
Added on 8/31/2009
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Answers:

Web Logic Server uses two mechanisms to determine if a given server instance is unavailable.
Each Web Logic Server instance in a cluster uses multicast to broadcast regular "heartbeat" messages that advertise its availability. By monitoring heartbeat messages, server instances in a cluster determine when a server instance has failed. The other server instances will drop a server instance from the cluster, if they do not receive three consecutive heartbeats from that server instance
Web Logic Server also monitors socket errors to determine the availability of a server instance. For example, if server instance A has an open socket to server instance B, and the socket unexpectedly closes, server A assumes that server B is offline.



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