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WebLogic
Clustering -
Failover, and
Load Balancing
training
Vibrant technologies &
computers
Vashi
+919892900103 |
info@vibranttechnologies.co.i
n | www.
Vibranttechnologies.co.in
Introduction
 What is Clustering?
 Close cooperation of two or more
replicated servers to ensure fast, continuous
service to users.
 Clustering must provide the following:
 No bottlenecks to scaling
 No single point of failure
 Transparency to application developers
 Single-system image to administrators
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
2
Clustering
 Benefits of Clustering
 High-Availability and Scalability
 Key Capabilities of Clustering
 Failover
 New object can take over for the failed object
 Load Balancing
 Even distribution of jobs
 Challenges
 Replication without increasing load
 Propagating changes to servers participating in
the cluster
 Complex setup
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
3
WebLogic Clustering
 What is WebLogic?
 J2EE Application Server that is a platform for
developing distributed applications
 A hosting environment for EJBs
 Provides several services such as: JMS, JNDI,
JDBC, Transaction control, etc…
 WebLogic Clustering
 Consists of multiple copies of the WL Server
working together—so that there are
alternative objects to do the same job.
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
4
WebLogic Clustering
 Types of objects that can be clustered
 Servlets and JSPs
 EJBs
 RMI objects
 JMS destinations
 JDBC Connections
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
5
 Replica-aware stubs created at compile time
 Contains load-balancing algorithm
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
6
Typical Clustered Multi-Tier Architecture
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
7
Load Balancing
 Algorithms used:
 Round-Robin
 Cycles through instances in order
 Weight-Based
 Allocation of requests based upon relative
weights
 Random
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
8
What we did
 Set up a WL server in a clustered
environment
 2 Nodes and 1 Admin. server
 Deploy an EJB
 Stateful Session Bean that is replicated on the
cluster
 Simulate the action of multiple clients
 Remote Java client that creates multiple
threads and sends off requests in quick
succession
 Server logs client requests
 Used for gathering statistics
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
9
Test Setup
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
10
Results
 Most effective algorithm was Round-
Robin
 Weight-based is useful when there are
differences in the cluster hardware
 Degenerates to Round-Robin when using
identical weights in the cluster.
 Random was close to Round-Robin
 Scalability
 1 server results in cacheful exceptions
 Adding another node to the cluster
removed this problem with identical clients
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
11
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
12
0
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Round-Robin Weight-Based Random
Algorithm
RequestsperRun
Dante-1
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DanteCl2-1
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DanteCl2-3
Thank you
Vibrant Technologies &
Computers
+919892900103 | info@vibranttechnologies.co.in |
www. Vibranttechnologies.co.in
13

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Weblogic-clustering-failover-and-load-balancing-training

  • 1. WebLogic Clustering - Failover, and Load Balancing training Vibrant technologies & computers Vashi +919892900103 | info@vibranttechnologies.co.i n | www. Vibranttechnologies.co.in
  • 2. Introduction  What is Clustering?  Close cooperation of two or more replicated servers to ensure fast, continuous service to users.  Clustering must provide the following:  No bottlenecks to scaling  No single point of failure  Transparency to application developers  Single-system image to administrators Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 2
  • 3. Clustering  Benefits of Clustering  High-Availability and Scalability  Key Capabilities of Clustering  Failover  New object can take over for the failed object  Load Balancing  Even distribution of jobs  Challenges  Replication without increasing load  Propagating changes to servers participating in the cluster  Complex setup Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 3
  • 4. WebLogic Clustering  What is WebLogic?  J2EE Application Server that is a platform for developing distributed applications  A hosting environment for EJBs  Provides several services such as: JMS, JNDI, JDBC, Transaction control, etc…  WebLogic Clustering  Consists of multiple copies of the WL Server working together—so that there are alternative objects to do the same job. Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 4
  • 5. WebLogic Clustering  Types of objects that can be clustered  Servlets and JSPs  EJBs  RMI objects  JMS destinations  JDBC Connections Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 5
  • 6.  Replica-aware stubs created at compile time  Contains load-balancing algorithm Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 6
  • 7. Typical Clustered Multi-Tier Architecture Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 7
  • 8. Load Balancing  Algorithms used:  Round-Robin  Cycles through instances in order  Weight-Based  Allocation of requests based upon relative weights  Random Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 8
  • 9. What we did  Set up a WL server in a clustered environment  2 Nodes and 1 Admin. server  Deploy an EJB  Stateful Session Bean that is replicated on the cluster  Simulate the action of multiple clients  Remote Java client that creates multiple threads and sends off requests in quick succession  Server logs client requests  Used for gathering statistics Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 9
  • 10. Test Setup Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 10
  • 11. Results  Most effective algorithm was Round- Robin  Weight-based is useful when there are differences in the cluster hardware  Degenerates to Round-Robin when using identical weights in the cluster.  Random was close to Round-Robin  Scalability  1 server results in cacheful exceptions  Adding another node to the cluster removed this problem with identical clients Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 11
  • 12. Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 12 0 250 500 750 1000 1250 1500 1750 2000 2250 2500 2750 3000 3250 3500 3750 4000 4250 4500 4750 5000 5250 5500 5750 6000 6250 6500 6750 7000 Round-Robin Weight-Based Random Algorithm RequestsperRun Dante-1 Dante-2 Dante-3 DanteCl2-1 DanteCl2-2 DanteCl2-3
  • 13. Thank you Vibrant Technologies & Computers +919892900103 | info@vibranttechnologies.co.in | www. Vibranttechnologies.co.in 13

Editor's Notes

  1. Replica-aware stubs (client representation of a server-side object) Contains a list of servers participating in the cluster IP Multicast – server instances broadcast availability of services IP Sockets – peer-to-peer communication