Re: Clustering help..!

Wed, 26 Apr 2006 11:43:37 -0700 

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:[EMAIL PROTECTED] Sent: Wednesday, April 26, 2006 11:17 PM 
To: [email protected]
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:[EMAIL PROTECTED]
Sent: Wednesday, April 26, 2006 9:28 PM
To: [email protected]
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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