Where Load Balancing Takes Place

Hi guys:
I've seen a post by Todd Little.
http://www.oracle.com/technetwork/middleware/tuxedo/overview/ld-balc-in-oracle-tux-atmi-apps-1721269.pdf
In section "Where Load Balancing Takes Place"
It said
Whereas for /WS clients, the tpcall/tpacall/tpconnect just send the service request to WSH and *do not*
*perform load balancing in /WS clients*. WSH calls native client routine to achieve the load balancing
task on behalf of /WS clients. *To achieve the load balancing between /WS clients and WSL servers,*
*multiple WSL access points can be configured by WSNADDR.* This feature can assign the /WS clients
evenly to different WSL servers to balance the work load between WSL/WSH in the system.
I'm very confused about this description. In MP (clustered) mode, Where Load Balancing takes place?? the client side or server side ? I mean, all client send request to master node, and master node dispatch the request to other slave node ??

Hi,
All load balancing (or perhaps better called load optimization) occurs in the native client code where all request routing occurs. So in an MP configuration, the native client (or a handler in the case of workstation, Jolt, or IIOP clients) makes the routing decision which includes load balancing. So the client looks at the load on all the servers across the cluster and makes a routing decision taking into consideration such things as NETLOAD. Note however that before Tuxedo 12c the load information held locally for remote servers (actually queues) was never updated in realtime by the remote machines. Thus the load would increase continuously until the next BB scan at which point the BBL would zero the locally held load information for remote queues. In Tuxedo 12c with TSAM installed, the locally held load information for remote queues IS updated dynamically using a variety of techniques including piggybacking load information in reply messages and periodically sweeping load information to other machines in the cluster. The former works OK, whereas the latter works really well.
Also, the MASTER node in a cluster is basically just the boss for configuration and state changes. It has no special role in request routing or processing. In fact, if the MASTER machine dies, the cluster continues to operate just fine, but configuration and state changes such as starting or stopping servers can't occur until the MASTER is back up or migrated to the BACKUP.
Regards,
Todd Little
Oracle Tuxedo Chief Architect

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-----web.xml-------
<?xml version="1.0" encoding="UTF-8"?>
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<servlet-mapping>
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<servlet>
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<jsp-file>TestLogout.jsp</jsp-file>
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<servlet-mapping>
<servlet-name>TestLogout.jsp</servlet-name>
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Hi,
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Regards
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http://2pintSoftware.com

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When configuring load balancing with Weblogic clusters, does load
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"Wei Guan" <[email protected]> wrote:
I don't think you can configure this load balancing in weblogic in current
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weighted load-balancing there. Otherwise, weblogic proxy will use DNS round
robin to do the load-balancing between JSP engins.
My 2 cents.
Cheers - Wei
Michael Yakimisky <[email protected]> wrote in message
news:[email protected]...
Anyone and everyone,
When configuring load balancing with Weblogic clusters, does load
balancing take effect for all services or just EJB and RMI? Or another
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Thanks in advance,
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More info at http://edocs.bea.com/wls/docs61/cluster/alteon.html#591902 and
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          Kumar Allamraju wrote:
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          >
          > --
          > Kumar
          > "Joe" <[email protected]> wrote in message news:[email protected]...
          > >
          > > Using WebLogic 6.1 SP2, the proxy plug-in handles the logic of connecting
          > to
          > > the secondary server (stored in a cookie) if the primary is down. How
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          > >
          > >
          > >
          > >
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> I am considering upgrading my LabView software from 6i to 6.1 for the
> new "two click" remote front panel feature. I have already seen a demo
> of this feature but have just a few questions before I get the
> upgrade:
>
> My setup consists of several pieces of equipment connected to Labview
> via GPIB, to aid in the evaluation of a new microchip.
>
> 1. I wish to grant control of the setup to anyone with a web browser,
> Is the remote monitoring feature compatible with both Netscape and IE?
>
Yes. Provided they are resonably modern versions.
> 2. The VI which controls the setup is currently located on the PC
> beside my setup. When I embed a VI in a remote front panel, where does
> the processing take place, is the local VI still controlling the
>
setup? and the remote panel just sending and receiving data from the
> local VI.
>
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Message was edited by:
berrintj

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