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From Dave Colasurdo <davec...@earthlink.net>
Subject Re: Clustering help..!
Date Wed, 26 Apr 2006 19:08:19 GMT


Santosh Koti wrote:
> Dave, 
> 
> Here is my understanding:
> 
>  "Even in the sticky session, session replication happens whenever there
> is change in session data by the client, the re-routing happens only on
> failure of the cluster member..!"  - Am I right...?
> 
Yes

> PS: Earlier, I thought, in sticky session replication will not happen.,
> it is altogether a new episode....! , thanks for clearing it..!
> 
> 
> Thanks,
> Santosh.
> "Don't talk about yourself; it will be done when you leave. "
>  
> 
> -----Original Message-----
> From: Dave Colasurdo [mailto:davecola@earthlink.net] 
> Sent: Thursday, April 27, 2006 12:13 AM
> To: user@geronimo.apache.org
> Subject: Re: Clustering help..!
> 
> Santosh Koti wrote:
>> Dave,
>>
>> One more question as u said: 
>> "Requests will be rerouted to a different cluster member only when the
> 
>> original cluster member fails or is unreachable." - If the failure
>> occurs , will it result in session state replication on to the other
>> member, or it is a new stuff altogether...??? !!
>>
> The cluster member that owns the session will replicate session state 
> (for that session) with all other cluster members anytime the session 
> data is updated from the client.
> So, when a cluster member fails, the session state is already available 
> on the new cluster member..
> 
> The idea is that the end user (web browser) will continue to work (with 
> the same contents in their "shopping cart") without ever knowing that a 
> server failed.
> 
>> Thanks,
>> Santosh.
>> "Don't talk about yourself; it will be done when you leave. "
>>  
>>
>>
>>
>> -----Original Message-----
>> From: Dave Colasurdo [mailto:davecola@earthlink.net] 
>> Sent: Wednesday, April 26, 2006 11:17 PM
>> To: user@geronimo.apache.org
>> Subject: Re: Clustering help..!
>>
>> Comments below..
>>
>> Santosh Koti wrote:
>>> Hernan,
>>>
>>>  
>>>
>>> I got it working finally , both with the sticky session=0,1 , in 
>>> non-sticky session , some time it fails...!
>>>
>>>  
>>>
>>> Any idea..?
>>>
>>>
>> I'd recommend always running with sticky session enabled.  This means 
>> that all requests from a particular client (e.g. browser)will be
> routed 
>> to the same cluster member if session data is used.  This is the
> safest 
>> and most efficient way to assure that session state is maintained
> across
>> http requests.
>>
>> Requests will be rerouted to a different cluster member only when the 
>> original cluster member fails or is unreachable.
>>
>>> (I have given my config details after my questions,ie, below..!)
>>>
>>>  
>>>
>>> *Some questions:*
>>>
>>>  
>>>
>>> *a) Note: Once I build my EAR file , I deploy it on both the
> machines,
>>> so the Geronimo-web.xml is the same on both machines, I guess it has
>> to 
>>> be different w.r.t 'mcastBindAddress' - value for different
>> instances..! *
>>
>> Yes, there are two spots in the deployment plan that needs to be
> updated
>> with the IP address for the specific server.
>>
>>> * *
>>>
>>> * *
>>>
>>> *b) One more question I need to ask is : gbean name="FarmWarDeployer"
>> , 
>>> needs to be specified in the deployment plan , or is it optional...?*
>>>
>> IIRC, FarmWarDeployer is commented out in the deployment plan as it
> was 
>> never tested.  It was suspected that there may be additional changes
> to 
>> geronimo to fully support farming.
>>
>>
>>> * *
>>>
>>> * *
>>>
>>> *c) By the way , what is farming , is it used for deploying **ur** 
>>> application on to the cluster members, if so , will it change the 
>>> deployment plan at run time..?*
>>>
>>>  
>> Farming provides hot deployment of an application across a cluster.
>> Basically, an application (war) is deployed on one cluster member and
> is
>> automatically deployed to all of the other members in the cluster.
>>
>>> *(correct me if I am wrong..!)*
>>>
>>>  
>>>
>>>  
>>>
>>> As asked, here are my details (that I added to the existing stuff):
>>>
>>>  
>>>
>>> -------------Part of Httpd.conf file ------
>>>
>>>  
>>>
>>> LoadModule jk_module modules\mod_jk.so
>>>
>>> JkWorkersFile C:\Apache-HTTP\Apache2\conf\workers.properties
>>>
>>> JkLogFile     C:\Apache-HTTP\Apache2\logs\mod_jk.log
>>>
>>> #JkLogLevel    info
>>>
>>>  
>>>
>>> JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
>>>
>>> JkAutoAlias C:\Apache-HTTP\Apache2\config-store
>>>
>>> #JkMount /console/* ajp13
>>>
>>> #JkMount /setl/* ajp13
>>>
>>> JkMount /setl* loadbalancer
>>>
>>>  
>>>
>>> -------------End of Httpd.conf file ------
>>>
>>>  
>>>
>>> --------------workers.properties----------------
>>>
>>> worker.list=loadbalancer,status,node1,node2
>>>
>>> worker.node1.port=8009
>>>
>>> worker.node1.host=localhost
>>>
>>> worker.node1.type=ajp13
>>>
>>> worker.node1.lbfactor=100
>>>
>>>  
>>>
>>> worker.node2.port=8009
>>>
>>> worker.node2.host=172.25.203.139
>>>
>>> worker.node2.type=ajp13
>>>
>>> worker.node2.lbfactor=100
>>>
>>>  
>>>
>>> worker.loadbalancer.type=lb
>>>
>>> worker.loadbalancer.balance_workers=node1,node2
>>>
>>> #worker.loadbalancer.sticky_session=0
>>>
>>> worker.loadbalancer.sticky_session=1
>>>
>>>  
>>>
>>>  
>>>
>>> worker.status.type=status
>>>
>>> /setl=loadbalancer
>>>
>>> /setl/*=loadbalancer
>>>
>>>  
>>>
>>>  
>>>
>>> --------------end of workers.properties----------------
>>>
>>>  
>>>
>>>  
>>>
>>> -----------------geronimo-web.xml----------------
>>>
>>>  
>>>
>>> <?xml version="1.0" encoding="UTF-8"?>
>>>
>>> <web-app
>>>
>>>     xmlns="http://geronimo.apache.org/xml/ns/j2ee/web-1.0"
>>>
>>>     xmlns:naming="http://geronimo.apache.org/xml/ns/naming-1.0"   
>>>
>>>     configId="MyConfigName"
>>>
>>>     parentId="SBank/Entities"
>>>
>>>   >
>>>
>>>  
>>>
>>>   <container-config>
>>>
>>>         <tomcat 
>>> xmlns="http://geronimo.apache.org/xml/ns/web/tomcat/config-1.0">
>>>
>>>             <cluster>TomcatCluster</cluster>
>>>
>>>            
>>>
>>>            
>>>
>>>                 <gbean name="TomcatCluster" 
>>> class="org.apache.geronimo.tomcat.cluster.CatalinaClusterGBean">
>>>
>>>                   <attribute 
>>>
> name="className">org.apache.catalina.cluster.tcp.SimpleTcpCluster</attri
>> bute>
>>>                   <attribute name="initParams">
>>>
>>>                       
>>> managerClassName=org.apache.catalina.cluster.session.DeltaManager
>>>
>>>                       expireSessionsOnShutdown=false
>>>
>>>                       useDirtyFlag=false
>>>
>>>                       notifyListenersOnReplication=true
>>>
>>>                   </attribute>
>>>
>>>          
>>>
>>>                   <reference name="Membership"> 
>>> <moduleType>J2EEModule</moduleType> <name>TomcatMembership</name>

>>> </reference>
>>>
>>>                   <reference name="Receiver"> 
>>> <moduleType>J2EEModule</moduleType> <name>TomcatReceiver</name>

>>> </reference>
>>>
>>>                   <reference name="Sender"> 
>>> <moduleType>J2EEModule</moduleType> <name>TomcatSender</name>
>> </reference>
>>>                   <reference name="TomcatValveChain"> 
>>> <moduleType>J2EEModule</moduleType> <name>ReplicationValve</name>

>>> </reference>
>>>
>>>                   <!--
>>>
>>>                   <reference name="ClusterDeployer"> 
>>> <moduleType>J2EEModule</moduleType> <name>FarmWarDeployer</name>

>>> </reference>
>>>
>>>                   -->
>>>
>>>                     </gbean>
>>>
>>>                    
>>>
>>>                     <gbean name="TomcatMembership" 
>>> class="org.apache.geronimo.tomcat.cluster.MembershipServiceGBean">
>>>
>>>                         <attribute 
>>>
> name="className">org.apache.catalina.cluster.mcast.McastService</attribu
>> te>
>>>                         <attribute name="initParams">
>>>
>>>                             mcastAddr=228.0.0.4
>>>
>>>                             mcastBindAddress= 172.21.34.97
>>>
>>>                             mcastPort=45564
>>>
>>>                             mcastFrequency=500
>>>
>>>                             mcastDropTime=3000
>>>
>>>                         </attribute>
>>>
>>>                    </gbean>
>>>
>>>                   
>>>
>>>                   
>>>
>>>                        <!-- Receiver -->
>>>
>>>               
>>>
>>>                    <gbean name="TomcatReceiver"
>>>
>>>                        
>>> class="org.apache.geronimo.tomcat.cluster.ReceiverGBean">
>>>
>>>                        <attribute 
>>>
> name="className">org.apache.catalina.cluster.tcp.ReplicationListener</at
>> tribute>
>>>                        <attribute name="initParams">
>>>
>>>                            tcpListenAddress= 172.21.34.97
>>>
>>>                            tcpListenPort=4001
>>>
>>>                            tcpSelectorTimeout=100
>>>
>>>                            tcpThreadCount=6
>>>
>>>                        </attribute>
>>>
>>>                    </gbean> 
>>>
>>>               
>>>
>>>                    <!-- Sender -->
>>>
>>>               
>>>
>>>                    <gbean name="TomcatSender"
>>>
>>>                        
>>> class="org.apache.geronimo.tomcat.cluster.SenderGBean">
>>>
>>>                        <attribute 
>>>
> name="className">org.apache.catalina.cluster.tcp.ReplicationTransmitter<
>> /attribute>
>>>                        <attribute name="initParams">
>>>
>>>                            replicationMode=pooled
>>>
>>>                            ackTimeout=15000
>>>
>>>                        </attribute>
>>>
>>>                         </gbean>  
>>>
>>>                        
>>>
>>>                        
>>>
>>>                     <!-- Valves -->
>>>
>>>                  <gbean name="ReplicationValve"
>>>
>>>                    class="org.apache.geronimo.tomcat.ValveGBean">
>>>
>>>                    <attribute 
>>>
> name="className">org.apache.catalina.cluster.tcp.ReplicationValve</attri
>> bute>
>>>                    <attribute name="initParams">
>>>
>>>                    
>>>
> filter=.*\.gif;.*\.js;.*\.css;.*\.png;.*\.jpeg;.*\.jpg;.*\.htm;.*\.html;
>> .*\.txt;
>>>                    </attribute>
>>>
>>>                  </gbean>   
>>>
>>>     
>>>
>>>            
>>>
>>>         </tomcat>
>>>
>>>   </container-config>
>>>
>>>    
>>>
>>> </web-app>
>>>
>>>  
>>>
>>> ----------------------end of Geronimo-web.xml---------------------
>>>
>>>  
>>>
>>>  
>>>
>>>  
>>>
>>> Thanks for ur time & effort..!
>>>
>>>  
>>>
>>>  
>>>
>>> Smiles,
>>>
>>> Santosh.
>>>
>>> "Don't talk about yourself; it will be done when you leave. "
>>>
>>>  
>>>
>>>  
>>>
>>> -----Original Message-----
>>> From: Hernan Cunico [mailto:hcunico@gmail.com]
>>> Sent: Wednesday, April 26, 2006 9:28 PM
>>> To: user@geronimo.apache.org
>>> Subject: Re: Clustering help..!
>>>
>>>  
>>>
>>> Hi Santosh,
>>>
>>> can you provide more details (what, how, when)
>>>
>>>  
>>>
>>> Can you forward a request from one HTTP to one Geronimo?
>>>
>>>  
>>>
>>> Cheers!
>>>
>>> Hernan
>>>
>>>  
>>>
>>> Santosh Koti wrote:
>>>
>>>>  Hi Guys,
>>>>  While doing clustering ,
>>>>  I have the following setup:
>>>>   Machine1: Geronimo1
>>>>  Machine2: Geronimo2
>>>>  Machine3: Apache 1
>>>>  Machine4: Apache2
>>>>  I had made the config, but my apache setup is fine , but I think ,
>> it is
>>>>  not able to connect to my expected clustered machines..!
>>>>  What is that , I am missing..?
>>>>  Thanks,
>>>>  Santosh.
>>>>  "Don't talk about yourself; it will be done when you leave. "
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