1. What is clustering? How do weblogic instances communicate
in a clustered environment!
2. In a cluster, if one of the servers has issues and is not
accessible, will the other servers know about it? and how??
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Answer Posted / mohit
1. cluster is group of WLS instances which are capable of
sharing loads (through load balancing) and providing high
availability for all deployments.
Weblogic instance uses the multicast address to
commmunicate with each other (to communicate their status
to other members of the cluster).
2. Yes, Server instances are aware of the accessibility of
the other members of the cluster (as each server instance
sends heartbeats on <multicast address>:<multicast port>)
and hence are failover capable.
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