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??
- 6 Answers
- 25120 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / kruthi
1)A WLS clustr consists a group of server instances that
work together and look like a single instance to the
client.Cluster provides increased scalability, high
availability, load balancing, reliability etc.Through
multicaste adresses all the WLserver will communicate
through Heart Beat.For ever few sec the WLS instances will
release thir heart beats and if any of the server instances
does not release the heart beat then that server in
unavailable.And the stub also refreshes its list very
periodicaly so that it can know the available server
instances.
2)Yes, the other server will know through Heart Beats.
| Is This Answer Correct ? | 41 Yes | 3 No |
Answer / 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.
| Is This Answer Correct ? | 28 Yes | 0 No |
Answer / meena s.
A WebLogic Server cluster consists of multiple WebLogic
Server server instances running simultaneously and working
together to provide increased scalability and reliability.
A cluster appears to clients to be a single WebLogic Server
instance. The server instances that constitute a cluster
can run on the same machine, or be located on different
machines. You can increase a cluster’s capacity by adding
additional server instances to the cluster on an existing
machine, or you can add machines to the cluster to host the
incremental server instances.
| Is This Answer Correct ? | 30 Yes | 9 No |
Multiple servers can handle request is cluster
cluster Achieved High Availability by implementing fail-over
if u are implementing fail-over u achieved High Availability
yes Knows, cluster Member communicate each other by using multicast address .multicast address using cluster members through servers sends Heart Beats
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / michael harris
First of all, clusters are connected servers.
As far as I know if there is a problem it will be noticed
because they work as one big server.
I can suggest you this site:
http://www.ozekiphone.com/what-is-voip-cluster-355.html
Clusters and other useful topics are discussed on this site
in connection with Ozeki Phone System X.
| Is This Answer Correct ? | 1 Yes | 2 No |
Answer / adeel
Which address should be given to clients. As i have configured Oracle weblogic cluster on 2 VMs but on different ips' like http://10.14.3.50:7103 and on http://10.14.3.51:7203 now how can i make them combine with virtual IP as we make it in cluster environment.like a 3rd IP from where clients can access OWL application.
| Is This Answer Correct ? | 1 Yes | 4 No |
What is clustering and what is achieved through it?
What can happen when stub can’t to connect to web-logic server instances?
What are the enhancements in ejb 2.0 with respect to cmp?
How do I call oracle stored procedures that take no parameters? : BEA Weblogic
What is the difference in the web.xml and weblogic.xml ?
In how many ways we can implementg session replication?
Tell me how is the security handled in web logic j2ee connector architecture?
How should you type cast a remote object?
Explain the concepts and capabilities of ANT ?
What are stubs?
What are the advantages and disadvantages of node manager?
How to set Connection Pool size in Weblogic Server ?
Core Java 
