Tiered Architecture and Clustering
Hi,
Was wondering if anyone had problems setting up clustering in a
tiered environment. What we are looking to do is setup a load balancer
in front of a weblogic presentation tier (Servlets and JSP) that in
turn connect to a clustered application tier of EJB's. Just some
random thoughts:
1) Does the replica aware stub live in the presentation tier?
2) Does it make sense to put another load balancer between tier's? Or
just let the stub handle the load balancing?
Curious to know if anyone else has setup a similar configuration.
Regards,
Rick Mitterer
I have seen several such setups. You do not usually have a dedicated
hardware load balancer between the JSP/Servlet container and the EJB
container. The replica-aware stub is where the EJB client is, which is the
JSP/Servlet container.
Peace,
Cameron Purdy
Tangosol Inc.
<< Tangosol Server: How Weblogic applications are customized >>
<< Download now from http://www.tangosol.com/download.jsp >>
"Rick Mitterer" <[email protected]> wrote in message
news:[email protected]..
> Hi,
> Was wondering if anyone had problems setting up clustering in a
> tiered environment. What we are looking to do is setup a load balancer
> in front of a weblogic presentation tier (Servlets and JSP) that in
> turn connect to a clustered application tier of EJB's. Just some
> random thoughts:
>
> 1) Does the replica aware stub live in the presentation tier?
>
> 2) Does it make sense to put another load balancer between tier's? Or
> just let the stub handle the load balancing?
>
> Curious to know if anyone else has setup a similar configuration.
>
> Regards,
> Rick Mitterer
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Difference between n-layer software architecture and MVVM design pattern?
hello everyone,
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The model is however the data comes from wherever it comes from.
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That logic is in a viewmodel.
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They're in two of the n layers/tiers.
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Hello everybody
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Edited by: Venkat Rao on Aug 26, 2009 2:11 PM -
Unable to compile T1 Architecture and Simulation modelling tool
Hello,
I am trying to compile the T1 Simulation and Architecture modelling tool. The whole package is downloaded from opensparc.net
As a requirement, i am using Solaris 10 on SPARC based machine with Solaris Studio 12.3 as the compiler.
When i am running the "build_sas.sh full" script, it gives me an error:
--- Building n1 in strand ---
/opt/solarisstudio12.3//bin/CC -G -KPIC -fast -xO5 -DNDEBUG -DRS_INLINE=inline -DRS_MPSAS_COMPATIBLE -xarch=v9a -DHOST64BIT=1 -DN1_BOOTS10 -DMEMORY_SPARSE -I../../include/strand -I../../include/fw -I../../include/mmu -I../../include/asi -I../../include/core -I../../include/cpu -I../../include/system -I../../include/trap -I../../include/register -I/scratch//sam-t1/devtools/64/shade/inc -c -o obj64opt_n1/V9/V9_AsiReg.o V9/V9_AsiReg.cc
CC: Warning: -xarch=v9a is deprecated, use -m64 -xarch=sparcvis instead
"../../include/fw/Callee.h", line 98: Error: 'Riesling::operator new(unsigned long, Riesling::CalleeAllocator&)' may not be declared within a namespace.
1 Error(s) detected.
*** Error code 2
make: Fatal error: Command failed for target `obj64opt_n1/V9/V9_AsiReg.o'
Current working directory /scratch/sam-t1/src/riesling-cm/riesling/src/strand
*** Error code 1
make: Fatal error: Command failed for target `strand'
the Callee.h file has the following declaration for line#97:
inline void* operator new( size_t size, CalleeAllocator& a )/*{{{*/
// This new() function is called for code written as
// new(CalleeAllocator::allocator) Callee0<void>(f);
// and allocates size bytes from the CalleeAllocator
return a.alloc(size);
I did some Google search, and found that, "An allocation function shall be a class member function or a global function; a program is ill-formed if an allocation function is declared in a namespace scope other than global scope or declared static in global scope. [..]" (c++ - operator new inside namespace - Stack Overflow).
Would appreciate any help or suggestion.I tried you last suggestion, by simply moving the "new" function before the namespace, but it gave me the following Error: The prior declaration for operator new(unsigned long) has no exception specification.
So, I naively just defined the new as below, just to see what happens:
41 inline void* operator new( size_t size, CalleeAllocator& a) throw()
42 {return a.alloc(size);
43 }
which, after compilation gives the following error:
Error: std::bad_alloc is not in the prior exception specification
The download link to the whole package is here: OpenSPARC T1
At the end of the page, there is the download link to the OpenSPARC T1 Processor for Architecture and Performance Modeling Tools.
below is the original Callee.h file: Line 97 is where the operator new is defined which appears to be outside of namespace Riesling.
* ========== Copyright Header Begin ==========================================
* OpenSPARC T1 Processor File: Callee.h
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES.
* The above named program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
* The above named program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
* You should have received a copy of the GNU General Public
* License along with this work; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
* ========== Copyright Header End ============================================
#ifndef __Callee_h__
#define __Callee_h__
** Copyright (C) 2002, Sun Microsystems, Inc.
** Sun considers its source code as an unpublished, proprietary
** trade secret and it is available only under strict license provisions.
** This copyright notice is placed here only to protect Sun in the event
** the source is deemed a published work. Disassembly, decompilation,
** or other means of reducing the object code to human readable form
** is prohibited by the license agreement under which this code is
** provided to the user or company in possession of this copy."
#include "DataTypes.h"
namespace Riesling {
class CalleeAllocator/*{{{*/
// CalleeAllocator is a helper class for implementing the callee_method() and
// callee_function() functions that dynamically allocate a Callee object. This
// class takes the burden of the coder for having to manage those dynamically
// allocated objects and also avoids many calls to malloc().
public:
CalleeAllocator() : page(0), free((void**)1), full(0) {}
~CalleeAllocator()
while (page)
Page* help = page;
page = page->next;
delete help;
void* alloc( uint_t size )
void* cell;
size = (size + sizeof(void*) - 1) / sizeof(void*);
if ((free + size) > full)
page = new Page(page);
free = page->page;
full = page->page + Page::SIZE;
cell = free;
free = free + size;
return cell;
static CalleeAllocator allocator;
private:
class Page
public:
enum { SIZE = 4096 };
Page( Page* pntr ) : next(pntr) {}
Page* next;
void* page[SIZE];
Page* page;
void** free;
void** full;
inline void* operator new( size_t size, CalleeAllocator& a )/*{{{*/
// This new() function is called for code written as
// new(CalleeAllocator::allocator) Callee0<void>(f);
// and allocates size bytes from the CalleeAllocator
return a.alloc(size);
#ifndef COMPILER_ABI_CHANGED
inline void* gnu_vtbl_lookup( void* object, void* method )/*{{{*/
// The GNU compiler makes a virtual method into an integer index into the
// virtual table. It indicates this through bit 0 of the method being 1. If that
// bit is set then we get the virtual table and index for the method. If the bit 0
// is 0 then the method is a pointer to a function already.
#ifdef __GNU__
if (int(method) & 1)
return (*(void***)object)[int(method) / sizeof(void*)];
else
#endif
return method;
template<class Object, class Return> union MethodToFunction0/*{{{*/
// The templated union MethodToFunction0 converts a method pointer
// to a function pointer. The SparcWorks compiler already transforms
// method pointers to function pointers. For the GNU C++ compiler we
// need to check for virtual functions and do a virtual table lookup.
MethodToFunction0<Object,Return>( Object* object, Return (Object::*_method)() )
method(_method)
(void*&)function = gnu_vtbl_lookup(object,(void*)function);
Return (Object::*method)(); // The method to convert to a function
Return (*function)(void*); // The converted function, the first argument is the this pointer
template<class Return> class Callee0/*{{{*/
// The Callee class holds the function pointer or method pointer that
// represents the callee. The caller is a pointer to the Callee class.
public:
typedef Return (*Function)();
typedef Return (*Method)(void*);
Callee0<Return>( Function f )
object(0),
function(f)
template<class Object> Callee0<Return>( Object* o, MethodToFunction0<Object,Return> m )
object(o),
method(m.function)
Return call()
return object ? (*method)(object) : (*function)();
protected:
void* object; // If object is 0 (NULL) then we have a function to call
union // Else a method need to be called.
Method method;
Function function;
template<class Return> Callee0<Return>* callee_function( Return (*f)() )/*{{{*/
// callee_function() creates a Callee object of the function. The compiler
// helps in figuring out the type signature ... hurra for templates:
// Callee<void>* c = calee_function(f);
return new(CalleeAllocator::allocator) Callee0<Return>(f);
template<class Object, class Return> Callee0<Return>* callee_method( Object* o, Return (Object::*m)() )/*{{{*/
// callee_method() creates a Callee object of the method. The compiler
// helps in figuring out the type signature. The function requires an
// object and the template enforces that the object and method are of the
// same type. Don't cast object pointers. The method must exists, e.g.
// inherited methods need to be replicated (fat interface). Virtual methods
// are eradicated.
return new(CalleeAllocator::allocator) Callee0<Return>(o,MethodToFunction0<Object,Return>(o,m));
template<class Object, class Return, class Arg1> union MethodToFunction1/*{{{*/
MethodToFunction1<Object,Return,Arg1>( Object* object, Return (Object::*_method)(Arg1) )
method(_method)
(void*&)function = gnu_vtbl_lookup(object,(void*)function);
Return (Object::*method)(Arg1);
Return (*function)(void*,Arg1);
template<class Return, class Arg1> class Callee1/*{{{*/
public:
typedef Return (*Function)(Arg1);
typedef Return (*Method)(void*,Arg1);
Callee1<Return,Arg1>( Function f ) : object(0), function(f) {}
template<class Object> Callee1<Return,Arg1>( Object* o, MethodToFunction1<Object,Return,Arg1> m )
object(o),
method(m.function)
Return call( Arg1 a1 )
return object ? (*method)(object,a1) : (*function)(a1);
protected:
void* object;
union
Method method;
Function function;
template<class Return, class Arg1> Callee1<Return,Arg1>* callee_function( Return (*f)(Arg1) )/*{{{*/
return new(CalleeAllocator::allocator) Callee1<Return,Arg1>(f);
template<class Object, class Return, class Arg1> Callee1<Return,Arg1>* callee_method( Object* o, Return (Object::*m)(Arg1) )/*{{{*/
return new(CalleeAllocator::allocator) Callee1<Return,Arg1>(o,MethodToFunction1<Object,Return,Arg1>(o,m));
template<class Object, class Return, class Arg1, class Arg2> union MethodToFunction2/*{{{*/
MethodToFunction2<Object,Return,Arg1,Arg2>( Object* object, Return (Object::*_method)(Arg1,Arg2) )
method(_method)
(void*&)function = gnu_vtbl_lookup(object,(void*)function);
Return (Object::*method)(Arg1,Arg2);
Return (*function)(void*,Arg1,Arg2);
template<class Return, class Arg1, class Arg2> class Callee2/*{{{*/
public:
typedef Return (*Function)(Arg1,Arg2);
typedef Return (*Method)(void*,Arg1,Arg2);
Callee2<Return,Arg1,Arg2>( Function f ) : object(0), function(f) {}
template<class Object> Callee2<Return,Arg1,Arg2>( Object* o, MethodToFunction2<Object,Return,Arg1,Arg2> m )
object(o),
method(m.function)
Return call( Arg1 a1, Arg2 a2 )
return object ? (*method)(object,a1,a2) : (*function)(a1,a2);
protected:
void* object;
union
Method method;
Function function;
template<class Return, class Arg1, class Arg2> Callee2<Return,Arg1,Arg2>* callee_function( Return (*f)(Arg1,Arg2) )/*{{{*/
return new(CalleeAllocator::allocator) Callee2<Return,Arg1,Arg2>(f);
template<class Object, class Return, class Arg1, class Arg2> Callee2<Return,Arg1,Arg2>* callee_method( Object* o, Return (Object::*m)(Arg1,Arg2) )/*{{{*/
return new(CalleeAllocator::allocator) Callee2<Return,Arg1,Arg2>(o,MethodToFunction2<Object,Return,Arg1,Arg2>(o,m));
template<class Object, class Return, class Arg1, class Arg2, class Arg3> union MethodToFunction3/*{{{*/
MethodToFunction3<Object,Return,Arg1,Arg2,Arg3>( Object* object, Return (Object::*_method)(Arg1,Arg2,Arg3) )
method(_method)
(void*&)function = gnu_vtbl_lookup(object,(void*)function);
Return (Object::*method)(Arg1,Arg2,Arg3);
Return (*function)(void*,Arg1,Arg2,Arg3);
template<class Return, class Arg1, class Arg2, class Arg3> class Callee3/*{{{*/
public:
typedef Return (*Function)(Arg1,Arg2,Arg3);
typedef Return (*Method)(void*,Arg1,Arg2,Arg3);
Callee3<Return,Arg1,Arg2,Arg3>( Function f ) : object(0), function(f) {}
template<class Object> Callee3<Return,Arg1,Arg2,Arg3>( Object* o, MethodToFunction3<Object,Return,Arg1,Arg2,Arg3> m )
object(o),
method(m.function)
Return call( Arg1 a1, Arg2 a2, Arg3 a3 )
return object ? (*method)(object,a1,a2,a3) : (*function)(a1,a2,a3);
protected:
void* object;
union
Method method;
Function function;
template<class Return, class Arg1, class Arg2, class Arg3> Callee3<Return,Arg1,Arg2,Arg3>* callee_function( Return (*f)(Arg1,Arg2,Arg3) )/*{{{*/
return new(CalleeAllocator::allocator) Callee3<Return,Arg1,Arg2,Arg3>(f);
template<class Object, class Return, class Arg1, class Arg2, class Arg3> Callee3<Return,Arg1,Arg2,Arg3>* callee_method( Object* o, Return (Object::*m)(Arg1,Arg2,Arg3) )/*{{{*/
return new(CalleeAllocator::allocator) Callee3<Return,Arg1,Arg2,Arg3>(o,MethodToFunction3<Object,Return,Arg1,Arg2,Arg3>(o,m));
#else
template<class Return> class Callee0/*{{{*/
public:
Callee0<Return>() {}
virtual ~Callee0() {}
virtual Return call () = 0;
template<class Return> class CalleeFunction0 : public Callee0<Return>/*{{{*/
public:
typedef Return (*Function)();
CalleeFunction0<Return>( Function f ) : Callee0<Return>(), function(f) {}
Return call () { return (*function)(); }
protected:
Function function;
template<class Object, class Return> class CalleeMethod0 : public Callee0<Return>/*{{{*/
public:
typedef Return (Object::*Method)();
CalleeMethod0<Object,Return>( Object* o, Method m ) : Callee0<Return>(), object(o), method(m) {}
Return call () { return (object->*method)(); }
protected:
Object* object;
Method method;
template<class Return> CalleeFunction0<Return>* callee_function( Return (*f)() )/*{{{*/
return new(CalleeAllocator::allocator) CalleeFunction0<Return>(f);
template<class Object, class Return> CalleeMethod0<Object,Return>* callee_method( Object* o, Return (Object::*m)() )/*{{{*/
return new(CalleeAllocator::allocator) CalleeMethod0<Object,Return>(o,m);
template<class Return, class Arg1> class Callee1/*{{{*/
public:
Callee1<Return,Arg1>() {}
virtual ~Callee1() {}
virtual Return call ( Arg1 a1 ) = 0;
template<class Return, class Arg1> class CalleeFunction1 : public Callee1<Return,Arg1>/*{{{*/
public:
typedef Return (*Function)( Arg1 );
CalleeFunction1<Return,Arg1>( Function f ) : Callee1<Return,Arg1>(), function(f) {}
Return call ( Arg1 a1 ) { return (*function)(a1); }
protected:
Function function;
template<class Object, class Return, class Arg1> class CalleeMethod1 : public Callee1<Return,Arg1>/*{{{*/
public:
typedef Return (Object::*Method)( Arg1 );
CalleeMethod1<Object,Return,Arg1>( Object* o, Method m ) : Callee1<Return,Arg1>(), object(o), method(m) {}
Return call ( Arg1 a1 ) { return (object->*method)(a1); }
protected:
Object* object;
Method method;
template<class Return, class Arg1> CalleeFunction1<Return,Arg1>* callee_function( Return (*f)(Arg1) )/*{{{*/
return new(CalleeAllocator::allocator) CalleeFunction1<Return,Arg1>(f);
template<class Object, class Return, class Arg1> CalleeMethod1<Object,Return,Arg1>* callee_method( Object* o, Return (Object::*m)(Arg1) )/*{{{*/
return new(CalleeAllocator::allocator) CalleeMethod1<Object,Return,Arg1>(o,m);
template<class Return, class Arg1, class Arg2> class Callee2/*{{{*/
public:
Callee2<Return,Arg1,Arg2>() {}
virtual ~Callee2() {}
virtual Return call ( Arg1 a1, Arg2 a2 ) = 0;
template<class Return, class Arg1, class Arg2> class CalleeFunction2 : public Callee2<Return,Arg1,Arg2>/*{{{*/
public:
typedef Return (*Function)( Arg1, Arg2 );
CalleeFunction2<Return,Arg1,Arg2>( Function f ) : Callee2<Return,Arg1,Arg2>(), function(f) {}
Return call ( Arg1 a1, Arg2 a2 ) { return (*function)(a1,a2); }
protected:
Function function;
template<class Object, class Return, class Arg1, class Arg2> class CalleeMethod2 : public Callee2<Return,Arg1,Arg2>/*{{{*/
public:
typedef Return (Object::*Method)( Arg1, Arg2 );
CalleeMethod2<Object,Return,Arg1,Arg2>( Object* o, Method m ) : Callee2<Return,Arg1,Arg2>(), object(o), method(m) {}
Return call ( Arg1 a1, Arg2 a2 ) { return (object->*method)(a1,a2); }
protected:
Object* object;
Method method;
template<class Return, class Arg1, class Arg2> CalleeFunction2<Return,Arg1,Arg2>* callee_function( Return (*f)(Arg1,Arg2) )/*{{{*/
return new(CalleeAllocator::allocator) CalleeFunction2<Return,Arg1,Arg2>(f);
template<class Object, class Return, class Arg1, class Arg2> CalleeMethod2<Object,Return,Arg1,Arg2>* callee_method( Object* o, Return (Object::*m)(Arg1,Arg2) )/*{{{*/
return new(CalleeAllocator::allocator) CalleeMethod2<Object,Return,Arg1,Arg2>(o,m);
#endif
#endif -
Query on Physical Architecture,Logical Architecture and Model
Hi Experts,
I have a confusion regarding Physical Architecture,Logical Architecture and Model.Please tell me what type of information or data these above three hold.
ThanksPhysical architecture contains information on the physical setup of your environment i.e. server names, jdbc connection strings, usernames, Passwords etc.
The logical architecture provides a layer of abstraction that allows you to group via contexts similar Physical architecture components which reside in different locations/environments.
Models are the reversed representations of the objects in your physical architecture i.e. tables, flat files etc. Models are used as sources and targets in your interface design -
Ask the Expert: NGWC (3850/5760): Architecture and Deployment
Welcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn and ask questions about NGWC (3850/5760): Architecture and Deployment.
Ask questions from Monday, April 13th, 2015 to Friday, April 24th, 2015
This Ask the Expert Session will cover questions spanning NGWC products (3850/5760) on Implementation and Deployment from the Wired and Wireless perspective. This will be more specific to Customer’s and Partners questions covering 3850/5760 configuration, Implementation and deployment.
Dhiresh Yadav is a customer support engineer in High-Touch Technical Services (HTTS) handling supporting Wireless and Network Management based Cisco products and is based in Bangalore. His areas of expertise include Cisco Wireless CUWN and NGWC Product line. He has over 7 years of industry experience working with large enterprise and service provider networks. He also holds CCNP (RS) and CCIE (DC-Written) and CCIE Wireless certification.
Naveen Venkateshaiah is working as a Customer support engineer in High-Touch Technical Services (HTTS) handling and supporting Lan-switching and Data center Products. His areas of expertise include Catalyst 3k,4k , 6500 , Nexus 7k Platform He has over 7 years of industry experience working with large Enterprise and Service Provider networks. He also holds CCNA, CCNP (RS) and CCDP-ARCH,CCIE-R&S Written, AWLANFE, LCSAWLAN Certification.
Find other https://supportforums.cisco.com/expert-corner/events.
**Ratings Encourage Participation! **
Please be sure to rate the Answers to QuestionsHi Dhiyadav,
thank you for your reply it cleared some doubts that were in my mind but i need your more support to guide me a converged access deployment which i am going to deploy within few days.
i have
2x5508 in HA as MC
30x3850 switches, and all will be used as MA(s) with multiple SPGs
2X5508 1:1 as an anchor controller
1xISE 1.3 for guest access
1xCPI for wireless mgmt and monitoring purpose
1xMSE3355 with wips and context aware licenses
200x cisco 3702i WAP
50x WSSI module for monitoring the channels
can you please put a light on the design and guide me that which are the best possible solutions to get this job done very smoothly.
i will also let you know about my proposed design scenario but for sure i need your recommendations as well :)
so,
i will use 2x5508 wlcs in HA as a MC which are AP-Count and HA licensed..
3850 switches will be MA and i ll configure SPGs per floor switches stacks
WAPs will join on these 3850 MAs base on each floor
i would have 2 ssid like employee and guest
i will configure them on each 3850 stack MA along with their SVIs for users access like (empolyee and guest ssid)
here my question is for guest ssid and its vlan... do i configure it here or on anchor controller???
i want ISE to be integrated with wireless for employee 802.1x and for guest web Auth. so, how i will integrate ISE with wireless. i mean weather i will integrate it anchor controller or with each 3850 MA???
between foreign and anchor controller i will use new mobility instead of old EOIP!!!
where shall place ISE in my network, in DMZ or with Core switch?
my target for guest users to do not have access to any corporate network sources ?
MSE:
can i use both wips and context aware on the single MSE box?
if yes, than what is the best practice for configuring them?
are each 3850 MA will be added in MSE?
WSSI module . will be used for monitoring purpose for wips and context aware profiles.
all access point will be worked in local mode for serving users access.
thank you -
OWB - Installation Architecture and Infrastructure configuration
I thought it is a good idea to throw this out to the OWB community to see what your thinking is.
This is my first project; we are currently on detail design. The Client requests a document that covers the following details.
Architecture and Infrastructure configuration for OWB - Oracle Warehouse Builder – which is to be targeted at an ehosting data centre.
• What is the best practice either from Oracle
• Is it best to go for a 2Tier or 3Tier architecture
Infrastructure being of interest is:
• The use of Application server and web service for giving visibility and access to the runtime / design repository via the repository browser.
• The applicable application service i.e.: Control Centre Service
Can this distributed over multiple servers if you application server differs from you database server.
• Do you have any information similar to this you compiled in the past that I can use
• Or is there any source you can direct me to get this kind of informationCan this distributed over multiple servers if you
application server differs from you database server.This is not an OWB question. This is a database question. You are asking something like 'can I run Oracle with Apache with Tomcat?'. Simple answer is yes. Compex answer is load balancing?
Cheers,
Donna -
Session Failover and Clustering
Let's say that we have two WebServers (NES) with the weblogic plugin (say WS1 and WS2) and a cluster with two WebLogicCommerce AppServers (say AS1 and AS2). Let's assume that each WebServer and AppServer runs on its own machine (total: 4 machines). Now, let's assume that the WebServer "obj.conf" files (on both WS1 and WS2) are setup so that they point to the servers in the cluster (WebLogicCluster="AS1:7601,AS2:7601").
When a new request comes in to one of the WebServers (say WS1), the plugin will route it to one of the AppServers using Round-Robin (say AS1). A session will now be initiated in AS1 and it sends a response back to the client.
Question 1: How does the other proxy in WS2 know that all future requests for this client need to be forwarded to AS1?
Question 2: For failover, does the cluster automatically replicate the session state existing in AS1 onto AS2 before sending the response (does AS2 automatically become the secondary)?
Now let's assume that AS1 crashes/dies. When the next request from the client comes to WS1 or WS2, they will forward it to AS1 (assuming that WS2 knows about the client session in AS1) . Since AS1 has crashed, will the client eventually get a timeout error message?
Question 3: To ensure that the session failover happens so that AS2 gets the request instead (becomes the primary), do we need to setup a WebLogic Proxy Server? If so, why can't the plugins for NES provide the failover themselves?
Thank you very much for your help!
Giri
Thank you very much for your responses. It has been very helpful and I am clear on the session/clustering stuff. I have new questions on EJB and clustering which I will post as a separate thread.
Giri
"Jason Rosenberg" <[email protected]> wrote:
>And also, if the browser has cookies disabled, it is important for
>the app server to embed the WebLogicSession info via url rewriting,
>otherwise the proxy or NES will not be able to route the session
>properly.
>
>So, in all http responses, be sure to pass the url string through
>response.encodeURL(). This will do the right thing depending
>on whether cookies are enabled or not.
>
>I've just only recently figured this out. Haven't actually tried it
>all out yet, so forgive me if it is not quite this simple, but this
>seems to be the gist of it...
>
>Jason
>
>
>"Justin James" <[email protected]> wrote in message news:[email protected]...
>>
>> Giri,
>>
>> I'm not a weblogic representative, but I tried to replicate this proxing service inside a load balancing switch(BigIP) and I
>discovered a few things. The weblogic server sets a cookie (WebLogicSession)that the webserver plugin uses to manage the proxying.
>The cookie (found in the HTTP header information) contains encoded information about the primary and secondary application servers
>that the session is bound too. Any web server can read the cookie to determine how to dispatch the request to the primary server.
>If the primary server does not respond, the request is forwarded to the secondary server by the plugin. Regardless of cluster size,
>the session is replicated to only one other server.
>>
>> <[email protected]> wrote:
>> >Giri Alwar wrote:
>> >
>> >> I need a couple of clarifications. First with regard to Question 1, I understand that plugins provide load balancing and
>failover but what I really was asking is how the plugin in WS2 knows that a session for the client has been initiated in AS1 as a
>result of WS1 sending the initial request to AS1. If WS2 gets a future request from the client, it needs to know this to send the
>request to AS1. Does the plugin talk to the cluster to find out if there is a primary and who it is?
>> >>
>> >
>> >> I should have clarified that my other questions pertain to in-memory replication. If I do not persist the session in a database
>then does the client get an error message (timeout) when AS1 goes down (assuming we use NES with the WebLogic plugin)?
>> >
>> >Plugins' know how to route requests based on cookies. If it can't reach the primary server it will automatically try secondary.
>In your case it doesn't matter if it reaches to proxy 1 or proxy 2, it is still the same.
>> >
>> >- Prasad
>> >
>> >> To prevent this error message and achieve failover, do I need to use WebLogic as the proxy server? If so, why isn't the NES
>plugin doing this?
>> >
>> >> Thanks.
>> >> Giri
>> >>
>> >> Prasad Peddada <[email protected]> wrote:
>> >> >Giri Alwar wrote:
>> >> >
>> >> >> Let's say that we have two WebServers (NES) with the weblogic plugin (say WS1 and WS2) and a cluster with two
>WebLogicCommerce AppServers (say AS1 and AS2). Let's assume that each WebServer and AppServer runs on its own machine (total: 4
>machines). Now, let's assume that the WebServer "obj.conf" files (on both WS1 and WS2) are setup so that they point to the servers
>in the cluster (WebLogicCluster="AS1:7601,AS2:7601").
>> >> >>
>> >> >> When a new request comes in to one of the WebServers (say WS1), the plugin will route it to one of the AppServers using
>Round-Robin (say AS1). A session will now be initiated in AS1 and it sends a response back to the client.
>> >> >>
>> >> >> Question 1: How does the other proxy in WS2 know that all future requests for this client need to be forwarded to AS1?
>> >> >
>> >> > Plugin takes care of load balancing and failover, it is all transparent to the client.
>> >> >
>> >> >
>> >> >> Question 2: For failover, does the cluster automatically replicate the session state existing in AS1 onto AS2 before sending
>the response (does AS2 automatically become the secondary)?
>> >> >
>> >> > If you have only two yes it is automatically your secondary. Yes, replication is synchronous.
>> >> >
>> >> >>
>> >> >> Now let's assume that AS1 crashes/dies. When the next request from the client comes to WS1 or WS2, they will forward it to
>AS1 (assuming that WS2 knows about the client session in AS1) . Since AS1 has crashed, will the client eventually get a timeout
>error message?
>> >> >
>> >> > If you are using some kind of persistence then you will be able to retrieve the session information and since the server
>is not available the request will automatically failover.
>> >> >
>> >> >> Question 3: To ensure that the session failover happens so that AS2 gets the request instead (becomes the primary), do we
>need to setup a WebLogic Proxy Server? If so, why can't the plugins for NES provide the failover themselves?
>> >> >
>> >> > No, you need only one. Either NES or weblogic proxy.
>> >> >
>> >> >
>> >> >> Thank you very much for your help!
>> >> >> Giri
>> >> >
>> >> >- Prasad
>> >> >
>> >
>>
>
>
-
Hi, i'm Architec and my basic programs are: Autodesk Architecture and 3D studio Max. Can i run it in the MacBook Pro 13.3-Inch (NEWEST VERSION) Thanks!!!
You can but make sure you upgrade your RAM to 16GB - you can't do that through Apple...
Autodesk is a memory intensive program and the same goes with 3D Studio Max.....
Another suggeston if you must use a 13 inch is to buy the base 13 inch Macbook Pro and upgrade the RAM to 16GB and install a SSD to make it perform fast.
Another option is to get a refurbished 15 Inch Macbook Pro and do the RAM upgrade yourself...Advantage going 15 Inch is because it has it's own discrete graphics adapter rather than the built in Intel video. -
Establishing BPM, SOA and Enterprise Architecture and 'Governance'
Good day all,
(Originally posted on LinkedIn Oracle BPM group)
(This post can also apply to those implementing SOA and/or Enterprise Architecture)
After reviewing Oracle's IT Strategies from Oracle (ITSO) reference library (http://www.oracle.com/technetwork/topics/entarch/itso-165161.html) there does not seem to be anything specifically created (yet) targeting a BPM Governance Framework.
It is mentioned in a document in the above mentioned library, titled "Business Process Engineering", document ID E20216-03, file name of, oracle-pg-bpm-bus-proc-eng-r3-0-292099, page 5-2, 3rd paragraph, and I quote, " (see A Framework for BPM Governance for more information). Yet there is no link or section to or for said reference nor anything else within that document. Disappointing.
The closest and so far best approach I feel is a PDF file titled, ONE 2010-ART-BPM Governance Framework-VKhusidman-v51, authored by Vitaly Khusidman, titled "BPM Governance Framework", BPTrends ▪ July 2010
In this above document Dr. Khusidman recommends utilizing TOGAF as a framework for establishing the BPM Governance Framework. This also seems like a sound approach for those addressing the Enterprise Architecture (and governance which is a part of that larger 'whole') as well as SOA and BPM, especially those moving to a combination of SOA and BPM.
What are the thoughts and approaches being used by others, who may also be using some of Oracle's products and tools, and tasked with addressing the whole enterprise and/or SOA-BPM combined?
Cheers
Edited by: 863177 on Jun 23, 2011 6:16 AMOr that phase of product life cycle..
It seems as if academics are taking an increasing interests in SDN for gathering data. Possibly a knock-on of the University Alliances.
IMO this one is legitimate.
Cheers,
Julius
ps: Haven't guestified a Professor yet for ponits gaming with students. A whole new market!... -
Hi all,
I want to know abt RAC and clustering.Can any one describe me abt these two things.
I got two instances running in 2 AIX machines of size 25 gb each. im zero in this. can any one help me regarding this
first of all i do no what is RAC and Clustering
Regards
Elamaran2 instances (or more) will indeed be reading and writing to the same database files. When one instance fails, the other one takes over. Therefore availability is ensured.
look here fore info on RAC:
http://download-uk.oracle.com/docs/cd/B19306_01/rac.102/b14197/toc.htm -
Configuring Servers and Clusters
Hi All,
Whenever I am creatin HFM application,it is asking server,I have tried to "Configuring Servers and Clusters" ,but I am unable to coniger,please assist me.
Regards,
PrabhuFor your second question I think it is E. Coherence Web Edition
Because Coherence provides the ability to scale your application and also offers high availability by replicating the session objects to coherence nodes/caches.
Thanks,
Vijaya -
Application installation based on architecture and chassis
Hi,
Want to install application based on OS architecture and also whether the machine is laptop or desktop.
Let me know the WMI query that can be integrated in task sequence.
Regards, Shishir Kushawaha "If this thread answered your question, please click on "Mark as Answer"Using requirements is probably the better way to go but it does depend upon your scenario.
Also note that using Win32_Battery can be problematic for a few different reasons. Generally, the ChassisType attribute of Win32_SystemEnclosure is the preferred method (it's used by MDT). DataWidth of Win32_processor also can be problematic if you have
any legacy/unsupported OSes in the environment also; e.g., XP.
Jason | http://blog.configmgrftw.com
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