Converged LoadBalancer Overview

Converged Load-Balancer Overview1

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Overview of Converged Load-Balancer

Kshitiz Saxena

CLB Eng. Lead,

Sun Microsystems, Inc


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Agenda● Why Converged Load Balancer● Deployment Topology● Heterogeneous Application Deployments● What JavaEE developer needs to know● Load Balancing Policies● Health Detect Mechanism● Configuration interface● Demo● References


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Why we need Converged Load Balancer

● SIP, Converged Applications● Messages over Web path and SIP path need to be

directed to same server replica.

● Multiple client invocations need to be directed to same server replica.

● SIP component can result in outgoing requests as well.


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Deployment Topology


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Heterogeneous Application Deployments

● Pure JavaEE Web Applications, SIP Applications, Converged SIP and JavaEE Applications.

● Application Level Load Balancing.

● Load Balancing and Fail-over of pure Web App's over HTTP protocol.

● Converged Load Balancing and Fail-over of SIP, Converged App's over SIP and HTTP application protocol.


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What JavaEE developer needs to know

Primarily needs to concentrate on building a distributable application using standard platform constructs.

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Data Centric Rules


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Load Balancing policies● Consistent Hash Algorithm

● Hash key is extracted from request using configured data-centric rules or default-headers

● Above hash key is used to pick which instance should service the request

● Requests mapping to unhealthy instances are failed over to other healthy instances

● Fail-over is restricted to cluster boundary● Used for pure sip applications and converged applications


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Load Balancing policies(cont ...)

● Round Robin Algorithm● Instance to service request are selected in round-robin

fashion from a set of healthy instances● Sticky requests are serviced by same instance if it is

healthy● Sticky requests for unhealthy instances are failed over

to other healthy instances● Fail-over is restricted to cluster boundary● Used for pure web applications


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Health Check Mechanism

● CLB gathers cluster health information from Group Management Service(GMS) at startup

● CLB registers itself as listener for GMS events● GMS propagates all cluster view change events to CLB


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Configuration interface

● CLI● Sailfin user can create CLB using asadmin command

asadmin > create-converged-lb --target <cluster-name> --autocommit=true --configfile <converged-load-balancer-xml> <converged-load-balancer-name>

● GUI● Sailfin user can create CLB using admin GUI

interface as well


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DEMO


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References● Documentation :

http://docs.sun.com/app/docs/doc/820-4287/gghcl?a=view

● Functional Specification : http://wiki.glassfish.java.net/attach/FunctionalSpecsOnePagers/ConvergedLB-FSD.pdf

● Blog : http://blogs.sun.com/kshitiz/entry/converged_load_balancer


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Thanks

Kshitiz Saxena

CLB Eng. Lead,

Sun Microsystems, Inc

Converged LoadBalancer Overview

Technology

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