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  • INTERVIEW QUESTIONS J2EE APPLET DETAILS
    Question :
    How does a server know when another server is unavailable?
    Category Applet Interview Questions
    Rating (0.4) By 1067 users
    Added on 8/31/2009
    Views 1582
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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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