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Posted to users@tomcat.apache.org by Kursat Tuncel <ku...@gmail.com> on 2009/04/25 01:12:00 UTC
Problem with DeltaManager & BackupManager
Hi All,
I'm trying to setup a Tomcat Cluster configuration by using the example
provided in http://www.mbaworld.com/docs/cluster-howto.html
My problem is actually a bit strange. I've been digging the problem for 2
days but no success.
Here is my configuration:
4 Tomcat instances on the same machine, version 6.0.18
I'm using apache as the http connector, version Apache/2.2.11.
Here is my httpd.conf:
[...]
<Proxy balancer://ajpCluster>
BalancerMember ajp://127.0.0.1:12001 route=s1
BalancerMember ajp://127.0.0.1:12002 route=s2
BalancerMember ajp://127.0.0.1:12003 route=s3
BalancerMember ajp://127.0.0.1:12004 route=s4
</Proxy>
<Location /examples>
ProxyPass balancer://ajpCluster/examples stickysession=JSESSIONID
</Location>
[...]
Here are the 4 tomcat instances seperate config file
(each located in /var/tomcat[1-n] as CATALINA_BASE, properly configure
startup/shutdown scripts, ports etc.)
---
<Engine name="Catalina" defaultHost="localhost" jvmRoute="s1">
<!-- The request dumper valve dumps useful debugging information about
the request and response data received and sent by Tomcat.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.RequestDumperValve"/>
-->
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
<!-- Define the default virtual host
Note: XML Schema validation will not work with Xerces 2.2.
-->
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="8">
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel
className="org.apache.catalina.tribes.group.GroupChannel">
<Membership
className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver
className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="auto"
port="14001"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<Sender
className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport
className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=""/>
<Valve
className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<Deployer
className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
<ClusterListener
className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener
className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
</Host>
</Engine>
---
jvmRoute value and NioReceiver port value is 1-n for all 4 tomcat instances
(i.e., s1, s2, s3, s4 and
14001, 14002, 14003, 14004 for the instances)
Theoretically, this configuration should work.
I deployed "examples" application provided in tomcat examples and made it
"</distributable>" in web.xml of the application. I also used "Number guess"
game provided in examples application. I had to modify NumGuessBean.java to
implement java.io.Serializable.
So my setup seems ok upto now.
When I start tomcat instances, and run the example, I see from the
localhost.xxx.log that session is created on all nodes.
i.e.
..
INFO: SessionListener: sessionCreated('78C5694D20B69F54D5CEBD26F10D788D.s1')
Apr 25, 2009 1:34:51 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: attributeAdded('78C5694D20B69F54D5CEBD26F10D788D.s1',
'numguess', 'num.NumberGuessBean@19de0b5e')
..
Now my problem starts where.
When I start changing the value of session attribute by hitting "Refresh"
button, I don't see any replication happenning. Normally, I should see
"attributeReplaced" messages in the log. How to I know this, because exactly
same configuration but using "BackupManager" instead of "DeltaManager" it
happens exactly like this. But BackupManager only "backups" to one node to
another, i.e., it replicates deltas between two instances only, and the
choice of selecting this backupnode seems to be completely arbitrary. These
is nothing in the documentation how backup node is selected.
Also using balancer-manager handler in Apache, I disable the jvm instance
that my session was created and redirect it to another JVM. With
deltaManager, session start from beginning. With backup manager, session
continues only if I can select the right jvm, that is the backup of the
instance.
So it seems that I'm stuck with setting up a cluster configuration.
Has anyone tried Tomcat 6.0.18 with Apache 2.2.11, sticky session mode with
mod_proxy_ajp?
I'm stucked with this configuration.
--
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Re: Problem with DeltaManager & BackupManager
Posted by Kursat Tuncel <ku...@gmail.com>.
Nope, it is not a platform bug, I tried the same configuration on Linux (RHEL
5) and the result is same.
I suspect that this is a bug in DeltaManager, I'll try all 6.x versions to
see anything changes.
Kursat Tuncel wrote:
>
> Hi All,
>
> I'm trying to setup a Tomcat Cluster configuration by using the example
> provided in http://www.mbaworld.com/docs/cluster-howto.html
>
> My problem is actually a bit strange. I've been digging the problem for 2
> days but no success.
>
> Here is my configuration:
>
> 4 Tomcat instances on the same machine, version 6.0.18
> I'm using apache as the http connector, version Apache/2.2.11.
>
> Here is my httpd.conf:
> [...]
> <Proxy balancer://ajpCluster>
> BalancerMember ajp://127.0.0.1:12001 route=s1
> BalancerMember ajp://127.0.0.1:12002 route=s2
> BalancerMember ajp://127.0.0.1:12003 route=s3
> BalancerMember ajp://127.0.0.1:12004 route=s4
> </Proxy>
> <Location /examples>
> ProxyPass balancer://ajpCluster/examples stickysession=JSESSIONID
> </Location>
> [...]
>
> Here are the 4 tomcat instances seperate config file
> (each located in /var/tomcat[1-n] as CATALINA_BASE, properly configure
> startup/shutdown scripts, ports etc.)
>
> ---
> <Engine name="Catalina" defaultHost="localhost" jvmRoute="s1">
>
> <!-- The request dumper valve dumps useful debugging information
> about
> the request and response data received and sent by Tomcat.
> Documentation at: /docs/config/valve.html -->
>
> <!--
> <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
> -->
>
> <!-- This Realm uses the UserDatabase configured in the global JNDI
> resources under the key "UserDatabase". Any edits
> that are performed against this UserDatabase are immediately
> available for use by the Realm. -->
> <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
> resourceName="UserDatabase"/>
>
> <!-- Define the default virtual host
> Note: XML Schema validation will not work with Xerces 2.2.
> -->
> <Host name="localhost" appBase="webapps"
> unpackWARs="true" autoDeploy="true"
> xmlValidation="false" xmlNamespaceAware="false">
>
> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
> channelSendOptions="8">
>
> <Manager className="org.apache.catalina.ha.session.DeltaManager"
> expireSessionsOnShutdown="false"
> notifyListenersOnReplication="true"/>
>
> <Channel
> className="org.apache.catalina.tribes.group.GroupChannel">
> <Membership
> className="org.apache.catalina.tribes.membership.McastService"
> address="228.0.0.4"
> port="45564"
> frequency="500"
> dropTime="3000"/>
> <Receiver
> className="org.apache.catalina.tribes.transport.nio.NioReceiver"
> address="auto"
> port="14001"
> autoBind="100"
> selectorTimeout="5000"
> maxThreads="6"/>
>
> <Sender
> className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
> <Transport
> className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
> </Sender>
> <Interceptor
> className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
> <Interceptor
> className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
> </Channel>
>
> <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
> filter=""/>
> <Valve
> className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
>
> <Deployer
> className="org.apache.catalina.ha.deploy.FarmWarDeployer"
> tempDir="/tmp/war-temp/"
> deployDir="/tmp/war-deploy/"
> watchDir="/tmp/war-listen/"
> watchEnabled="false"/>
>
> <ClusterListener
> className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
> <ClusterListener
> className="org.apache.catalina.ha.session.ClusterSessionListener"/>
> </Cluster>
> </Host>
> </Engine>
> ---
>
> jvmRoute value and NioReceiver port value is 1-n for all 4 tomcat
> instances (i.e., s1, s2, s3, s4 and
> 14001, 14002, 14003, 14004 for the instances)
>
>
> Theoretically, this configuration should work.
>
> I deployed "examples" application provided in tomcat examples and made it
> "</distributable>" in web.xml of the application. I also used "Number
> guess" game provided in examples application. I had to modify
> NumGuessBean.java to implement java.io.Serializable.
>
> So my setup seems ok upto now.
>
> When I start tomcat instances, and run the example, I see from the
> localhost.xxx.log that session is created on all nodes.
>
> i.e.
> ..
> INFO: SessionListener:
> sessionCreated('78C5694D20B69F54D5CEBD26F10D788D.s1')
> Apr 25, 2009 1:34:51 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeAdded('78C5694D20B69F54D5CEBD26F10D788D.s1', 'numguess',
> 'num.NumberGuessBean@19de0b5e')
> ..
>
> Now my problem starts where.
>
> When I start changing the value of session attribute by hitting "Refresh"
> button, I don't see any replication happenning. Normally, I should see
> "attributeReplaced" messages in the log. How to I know this, because
> exactly same configuration but using "BackupManager" instead of
> "DeltaManager" it happens exactly like this. But BackupManager only
> "backups" to one node to another, i.e., it replicates deltas between two
> instances only, and the choice of selecting this backupnode seems to be
> completely arbitrary. These is nothing in the documentation how backup
> node is selected.
>
> Also using balancer-manager handler in Apache, I disable the jvm instance
> that my session was created and redirect it to another JVM. With
> deltaManager, session start from beginning. With backup manager, session
> continues only if I can select the right jvm, that is the backup of the
> instance.
>
> So it seems that I'm stuck with setting up a cluster configuration.
>
> Has anyone tried Tomcat 6.0.18 with Apache 2.2.11, sticky session mode
> with mod_proxy_ajp?
>
> I'm stucked with this configuration.
>
--
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RE: Problem with DeltaManager & BackupManager
Posted by Kursat Tuncel <ku...@gmail.com>.
Yes I tried, it is all the same.
Either I'm hitting a platform bug (which is HP-UX 11.31 Itanium JVM
1.6.0.03) or a tomcat 6.0.18 bug.
I'll try exactly the same configuration on my debian and see if anything is
different at all.
Robin Wilson-5 wrote:
>
> Sorry I can't be more help - I'm still trying to figure this out myself.
>
> What happens if you use 'channelsendoptions=6' instead of '8'?
>
> --
> Robin D. Wilson
> Director of Web Development
> KingsIsle Entertainment, Inc.
> WORK: 512-623-5913
> CELL: 512-426-3929
> www.KingsIsle.com
>
>
>
> -----Original Message-----
> From: Kursat Tuncel [mailto:kursat.tuncel@gmail.com]
> Sent: Friday, April 24, 2009 6:39 PM
> To: users@tomcat.apache.org
> Subject: RE: Problem with DeltaManager & BackupManager
>
>
> Hi Robin,
>
> Yes, /var/tomcat$n/webapps/examples/WEB-INF/web.xml contains
> <distributable/>
> and
>
> /var/tomcat$n/conf/context.xml is like this:
>
> <!--
> <Manager pathname="" />
> -->
>
> I think the problem is somewhat deeper. Because I can see from the logs
> that
> sessions are replicated when I use BackupManager. I mean, I only change
> DeltaManager to BackupManager, open 4 terminal and do
>
> tail -f /var/tomcat$n/logs/localhost.2009-04-25.log
>
> for each instance and
>
> see the following message:
>
> (instance 2)
> Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> sessionCreated('4A173B54F43792042A4FDB991D48C409.s2')
> Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeAdded('4A173B54F43792042A4FDB991D48C409.s2',
> 'numguess', 'num.NumberGuessBean@4b2dd538')
>
> (intance 4 log message)
>
> INFO: SessionListener:
> attributeAdded('4A173B54F43792042A4FDB991D48C409.s2',
> 'numguess', 'num.NumberGuessBean@3c6833f2')
> Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
> 'num.NumberGuessBean@3c6833f2')
> Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
> 'num.NumberGuessBean@5d2a73d9')
> Apr 25, 2009 2:29:01 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
> 'num.NumberGuessBean@e1bdb58')
> Apr 25, 2009 2:29:01 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
> 'num.NumberGuessBean@46dd75a4')
> ---
> (no log in instance 1 and 3)
>
> First, BackupManager seems to select the backup node arbitrarly. In this
> example, I created the session on jvmRoute s2, it replicated in on s4
> which
> seemed random to me. In order to eliminate this random behavior, I tried
> switching to DeltaManager with exactly same configuration,
>
> Here is the result:
>
> (all instance logs shows this)
> Apr 25, 2009 2:33:51 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> sessionCreated('3DA2A86518AC780A0832669D168B66FD.s2')
> Apr 25, 2009 2:33:51 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeAdded('3DA2A86518AC780A0832669D168B66FD.s2',
> 'numguess', 'num.NumberGuessBean@2fe6e305')
>
> --
>
> When I refresh the "jsp", I'm changing the session attribute because I can
> see from the example:
> [Good guess, but nope. Try lower. You have made 18 guesses.]
>
>
> and balancer-manager shows
>
> Worker URL Route RouteRedir Factor Set Status Elected To From
> ajp://127.0.0.1:12001 s1 1 0 Ok 0 0 0
> ajp://127.0.0.1:12002 s2 1 0 Ok 18 0 22K
> ajp://127.0.0.1:12003 s3 1 0 Ok 0 0 0
> ajp://127.0.0.1:12004 s4 1 0 Ok 0 0 0
>
>
> But there is nothing in the log as the one in BackupManager
> (attributeReplaced..)
>
> So, normally, when I disable "s2" route, session should continue, I must
> see
> the "counter" in the jsp increasing, but it starts over.
>
> Thank you.
> (sorry for typos)
>
>
>
> Robin Wilson-5 wrote:
>>
>> Did you comment out the <Manager pathname="" /> line in 'context.xml'?
>> If
>> you leave that it, it doesn't use the manager you defined for the
>> cluster.
>>
>> Also, is your web app defined as '<distributable />' in the 'web.xml'
>> file
>> from the webapp dir?
>>
>>
>> --
>> Robin D. Wilson
>> Director of Web Development
>> KingsIsle Entertainment, Inc.
>> WORK: 512-623-5913
>> CELL: 512-426-3929
>> www.KingsIsle.com
>>
>>
>>
>> -----Original Message-----
>> From: Kursat Tuncel [mailto:kursat.tuncel@gmail.com]
>> Sent: Friday, April 24, 2009 6:12 PM
>> To: users@tomcat.apache.org
>> Subject: Problem with DeltaManager & BackupManager
>>
>>
>> Hi All,
>>
>> I'm trying to setup a Tomcat Cluster configuration by using the example
>> provided in http://www.mbaworld.com/docs/cluster-howto.html
>>
>> My problem is actually a bit strange. I've been digging the problem for 2
>> days but no success.
>>
>> Here is my configuration:
>>
>> 4 Tomcat instances on the same machine, version 6.0.18
>> I'm using apache as the http connector, version Apache/2.2.11.
>>
>> Here is my httpd.conf:
>> [...]
>> <Proxy balancer://ajpCluster>
>> BalancerMember ajp://127.0.0.1:12001 route=s1
>> BalancerMember ajp://127.0.0.1:12002 route=s2
>> BalancerMember ajp://127.0.0.1:12003 route=s3
>> BalancerMember ajp://127.0.0.1:12004 route=s4
>> </Proxy>
>> <Location /examples>
>> ProxyPass balancer://ajpCluster/examples stickysession=JSESSIONID
>> </Location>
>> [...]
>>
>> Here are the 4 tomcat instances seperate config file
>> (each located in /var/tomcat[1-n] as CATALINA_BASE, properly configure
>> startup/shutdown scripts, ports etc.)
>>
>> ---
>> <Engine name="Catalina" defaultHost="localhost" jvmRoute="s1">
>>
>> <!-- The request dumper valve dumps useful debugging information
>> about
>> the request and response data received and sent by Tomcat.
>> Documentation at: /docs/config/valve.html -->
>>
>> <!--
>> <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
>> -->
>>
>> <!-- This Realm uses the UserDatabase configured in the global JNDI
>> resources under the key "UserDatabase". Any edits
>> that are performed against this UserDatabase are immediately
>> available for use by the Realm. -->
>> <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
>> resourceName="UserDatabase"/>
>>
>> <!-- Define the default virtual host
>> Note: XML Schema validation will not work with Xerces 2.2.
>> -->
>> <Host name="localhost" appBase="webapps"
>> unpackWARs="true" autoDeploy="true"
>> xmlValidation="false" xmlNamespaceAware="false">
>>
>> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
>> channelSendOptions="8">
>>
>> <Manager
>> className="org.apache.catalina.ha.session.DeltaManager"
>> expireSessionsOnShutdown="false"
>> notifyListenersOnReplication="true"/>
>>
>> <Channel
>> className="org.apache.catalina.tribes.group.GroupChannel">
>> <Membership
>> className="org.apache.catalina.tribes.membership.McastService"
>> address="228.0.0.4"
>> port="45564"
>> frequency="500"
>> dropTime="3000"/>
>> <Receiver
>> className="org.apache.catalina.tribes.transport.nio.NioReceiver"
>> address="auto"
>> port="14001"
>> autoBind="100"
>> selectorTimeout="5000"
>> maxThreads="6"/>
>>
>> <Sender
>> className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
>> <Transport
>> className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
>> </Sender>
>> <Interceptor
>> className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
>> <Interceptor
>> className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
>> </Channel>
>>
>> <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
>> filter=""/>
>> <Valve
>> className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
>>
>> <Deployer
>> className="org.apache.catalina.ha.deploy.FarmWarDeployer"
>> tempDir="/tmp/war-temp/"
>> deployDir="/tmp/war-deploy/"
>> watchDir="/tmp/war-listen/"
>> watchEnabled="false"/>
>>
>> <ClusterListener
>> className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
>> <ClusterListener
>> className="org.apache.catalina.ha.session.ClusterSessionListener"/>
>> </Cluster>
>> </Host>
>> </Engine>
>> ---
>>
>> jvmRoute value and NioReceiver port value is 1-n for all 4 tomcat
>> instances
>> (i.e., s1, s2, s3, s4 and
>> 14001, 14002, 14003, 14004 for the instances)
>>
>>
>> Theoretically, this configuration should work.
>>
>> I deployed "examples" application provided in tomcat examples and made it
>> "</distributable>" in web.xml of the application. I also used "Number
>> guess"
>> game provided in examples application. I had to modify NumGuessBean.java
>> to
>> implement java.io.Serializable.
>>
>> So my setup seems ok upto now.
>>
>> When I start tomcat instances, and run the example, I see from the
>> localhost.xxx.log that session is created on all nodes.
>>
>> i.e.
>> ..
>> INFO: SessionListener:
>> sessionCreated('78C5694D20B69F54D5CEBD26F10D788D.s1')
>> Apr 25, 2009 1:34:51 AM org.apache.catalina.core.ApplicationContext log
>> INFO: SessionListener:
>> attributeAdded('78C5694D20B69F54D5CEBD26F10D788D.s1',
>> 'numguess', 'num.NumberGuessBean@19de0b5e')
>> ..
>>
>> Now my problem starts where.
>>
>> When I start changing the value of session attribute by hitting "Refresh"
>> button, I don't see any replication happenning. Normally, I should see
>> "attributeReplaced" messages in the log. How to I know this, because
>> exactly
>> same configuration but using "BackupManager" instead of "DeltaManager" it
>> happens exactly like this. But BackupManager only "backups" to one node
>> to
>> another, i.e., it replicates deltas between two instances only, and the
>> choice of selecting this backupnode seems to be completely arbitrary.
>> These
>> is nothing in the documentation how backup node is selected.
>>
>> Also using balancer-manager handler in Apache, I disable the jvm instance
>> that my session was created and redirect it to another JVM. With
>> deltaManager, session start from beginning. With backup manager, session
>> continues only if I can select the right jvm, that is the backup of the
>> instance.
>>
>> So it seems that I'm stuck with setting up a cluster configuration.
>>
>> Has anyone tried Tomcat 6.0.18 with Apache 2.2.11, sticky session mode
>> with
>> mod_proxy_ajp?
>>
>> I'm stucked with this configuration.
>> --
>> View this message in context:
>> http://www.nabble.com/Problem-with-DeltaManager---BackupManager-tp23226268p23226268.html
>> Sent from the Tomcat - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
>> For additional commands, e-mail: users-help@tomcat.apache.org
>>
>>
>>
>
> --
> View this message in context:
> http://www.nabble.com/Problem-with-DeltaManager---BackupManager-tp23226268p23226529.html
> Sent from the Tomcat - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
--
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RE: Problem with DeltaManager & BackupManager
Posted by Robin Wilson <rw...@kingsisle.com>.
Sorry I can't be more help - I'm still trying to figure this out myself.
What happens if you use 'channelsendoptions=6' instead of '8'?
--
Robin D. Wilson
Director of Web Development
KingsIsle Entertainment, Inc.
WORK: 512-623-5913
CELL: 512-426-3929
www.KingsIsle.com
-----Original Message-----
From: Kursat Tuncel [mailto:kursat.tuncel@gmail.com]
Sent: Friday, April 24, 2009 6:39 PM
To: users@tomcat.apache.org
Subject: RE: Problem with DeltaManager & BackupManager
Hi Robin,
Yes, /var/tomcat$n/webapps/examples/WEB-INF/web.xml contains
<distributable/>
and
/var/tomcat$n/conf/context.xml is like this:
<!--
<Manager pathname="" />
-->
I think the problem is somewhat deeper. Because I can see from the logs that
sessions are replicated when I use BackupManager. I mean, I only change
DeltaManager to BackupManager, open 4 terminal and do
tail -f /var/tomcat$n/logs/localhost.2009-04-25.log
for each instance and
see the following message:
(instance 2)
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: sessionCreated('4A173B54F43792042A4FDB991D48C409.s2')
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: attributeAdded('4A173B54F43792042A4FDB991D48C409.s2',
'numguess', 'num.NumberGuessBean@4b2dd538')
(intance 4 log message)
INFO: SessionListener: attributeAdded('4A173B54F43792042A4FDB991D48C409.s2',
'numguess', 'num.NumberGuessBean@3c6833f2')
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@3c6833f2')
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@5d2a73d9')
Apr 25, 2009 2:29:01 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@e1bdb58')
Apr 25, 2009 2:29:01 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@46dd75a4')
---
(no log in instance 1 and 3)
First, BackupManager seems to select the backup node arbitrarly. In this
example, I created the session on jvmRoute s2, it replicated in on s4 which
seemed random to me. In order to eliminate this random behavior, I tried
switching to DeltaManager with exactly same configuration,
Here is the result:
(all instance logs shows this)
Apr 25, 2009 2:33:51 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: sessionCreated('3DA2A86518AC780A0832669D168B66FD.s2')
Apr 25, 2009 2:33:51 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: attributeAdded('3DA2A86518AC780A0832669D168B66FD.s2',
'numguess', 'num.NumberGuessBean@2fe6e305')
--
When I refresh the "jsp", I'm changing the session attribute because I can
see from the example:
[Good guess, but nope. Try lower. You have made 18 guesses.]
and balancer-manager shows
Worker URL Route RouteRedir Factor Set Status Elected To From
ajp://127.0.0.1:12001 s1 1 0 Ok 0 0 0
ajp://127.0.0.1:12002 s2 1 0 Ok 18 0 22K
ajp://127.0.0.1:12003 s3 1 0 Ok 0 0 0
ajp://127.0.0.1:12004 s4 1 0 Ok 0 0 0
But there is nothing in the log as the one in BackupManager
(attributeReplaced..)
So, normally, when I disable "s2" route, session should continue, I must see
the "counter" in the jsp increasing, but it starts over.
Thank you.
(sorry for typos)
Robin Wilson-5 wrote:
>
> Did you comment out the <Manager pathname="" /> line in 'context.xml'? If
> you leave that it, it doesn't use the manager you defined for the cluster.
>
> Also, is your web app defined as '<distributable />' in the 'web.xml' file
> from the webapp dir?
>
>
> --
> Robin D. Wilson
> Director of Web Development
> KingsIsle Entertainment, Inc.
> WORK: 512-623-5913
> CELL: 512-426-3929
> www.KingsIsle.com
>
>
>
> -----Original Message-----
> From: Kursat Tuncel [mailto:kursat.tuncel@gmail.com]
> Sent: Friday, April 24, 2009 6:12 PM
> To: users@tomcat.apache.org
> Subject: Problem with DeltaManager & BackupManager
>
>
> Hi All,
>
> I'm trying to setup a Tomcat Cluster configuration by using the example
> provided in http://www.mbaworld.com/docs/cluster-howto.html
>
> My problem is actually a bit strange. I've been digging the problem for 2
> days but no success.
>
> Here is my configuration:
>
> 4 Tomcat instances on the same machine, version 6.0.18
> I'm using apache as the http connector, version Apache/2.2.11.
>
> Here is my httpd.conf:
> [...]
> <Proxy balancer://ajpCluster>
> BalancerMember ajp://127.0.0.1:12001 route=s1
> BalancerMember ajp://127.0.0.1:12002 route=s2
> BalancerMember ajp://127.0.0.1:12003 route=s3
> BalancerMember ajp://127.0.0.1:12004 route=s4
> </Proxy>
> <Location /examples>
> ProxyPass balancer://ajpCluster/examples stickysession=JSESSIONID
> </Location>
> [...]
>
> Here are the 4 tomcat instances seperate config file
> (each located in /var/tomcat[1-n] as CATALINA_BASE, properly configure
> startup/shutdown scripts, ports etc.)
>
> ---
> <Engine name="Catalina" defaultHost="localhost" jvmRoute="s1">
>
> <!-- The request dumper valve dumps useful debugging information
> about
> the request and response data received and sent by Tomcat.
> Documentation at: /docs/config/valve.html -->
>
> <!--
> <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
> -->
>
> <!-- This Realm uses the UserDatabase configured in the global JNDI
> resources under the key "UserDatabase". Any edits
> that are performed against this UserDatabase are immediately
> available for use by the Realm. -->
> <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
> resourceName="UserDatabase"/>
>
> <!-- Define the default virtual host
> Note: XML Schema validation will not work with Xerces 2.2.
> -->
> <Host name="localhost" appBase="webapps"
> unpackWARs="true" autoDeploy="true"
> xmlValidation="false" xmlNamespaceAware="false">
>
> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
> channelSendOptions="8">
>
> <Manager className="org.apache.catalina.ha.session.DeltaManager"
> expireSessionsOnShutdown="false"
> notifyListenersOnReplication="true"/>
>
> <Channel
> className="org.apache.catalina.tribes.group.GroupChannel">
> <Membership
> className="org.apache.catalina.tribes.membership.McastService"
> address="228.0.0.4"
> port="45564"
> frequency="500"
> dropTime="3000"/>
> <Receiver
> className="org.apache.catalina.tribes.transport.nio.NioReceiver"
> address="auto"
> port="14001"
> autoBind="100"
> selectorTimeout="5000"
> maxThreads="6"/>
>
> <Sender
> className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
> <Transport
> className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
> </Sender>
> <Interceptor
> className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
> <Interceptor
> className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
> </Channel>
>
> <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
> filter=""/>
> <Valve
> className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
>
> <Deployer
> className="org.apache.catalina.ha.deploy.FarmWarDeployer"
> tempDir="/tmp/war-temp/"
> deployDir="/tmp/war-deploy/"
> watchDir="/tmp/war-listen/"
> watchEnabled="false"/>
>
> <ClusterListener
> className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
> <ClusterListener
> className="org.apache.catalina.ha.session.ClusterSessionListener"/>
> </Cluster>
> </Host>
> </Engine>
> ---
>
> jvmRoute value and NioReceiver port value is 1-n for all 4 tomcat
> instances
> (i.e., s1, s2, s3, s4 and
> 14001, 14002, 14003, 14004 for the instances)
>
>
> Theoretically, this configuration should work.
>
> I deployed "examples" application provided in tomcat examples and made it
> "</distributable>" in web.xml of the application. I also used "Number
> guess"
> game provided in examples application. I had to modify NumGuessBean.java
> to
> implement java.io.Serializable.
>
> So my setup seems ok upto now.
>
> When I start tomcat instances, and run the example, I see from the
> localhost.xxx.log that session is created on all nodes.
>
> i.e.
> ..
> INFO: SessionListener:
> sessionCreated('78C5694D20B69F54D5CEBD26F10D788D.s1')
> Apr 25, 2009 1:34:51 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeAdded('78C5694D20B69F54D5CEBD26F10D788D.s1',
> 'numguess', 'num.NumberGuessBean@19de0b5e')
> ..
>
> Now my problem starts where.
>
> When I start changing the value of session attribute by hitting "Refresh"
> button, I don't see any replication happenning. Normally, I should see
> "attributeReplaced" messages in the log. How to I know this, because
> exactly
> same configuration but using "BackupManager" instead of "DeltaManager" it
> happens exactly like this. But BackupManager only "backups" to one node to
> another, i.e., it replicates deltas between two instances only, and the
> choice of selecting this backupnode seems to be completely arbitrary.
> These
> is nothing in the documentation how backup node is selected.
>
> Also using balancer-manager handler in Apache, I disable the jvm instance
> that my session was created and redirect it to another JVM. With
> deltaManager, session start from beginning. With backup manager, session
> continues only if I can select the right jvm, that is the backup of the
> instance.
>
> So it seems that I'm stuck with setting up a cluster configuration.
>
> Has anyone tried Tomcat 6.0.18 with Apache 2.2.11, sticky session mode
> with
> mod_proxy_ajp?
>
> I'm stucked with this configuration.
> --
> View this message in context:
> http://www.nabble.com/Problem-with-DeltaManager---BackupManager-tp23226268p23226268.html
> Sent from the Tomcat - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
--
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RE: Problem with DeltaManager & BackupManager
Posted by Kursat Tuncel <ku...@gmail.com>.
Hi Robin,
Yes, /var/tomcat$n/webapps/examples/WEB-INF/web.xml contains
<distributable/>
and
/var/tomcat$n/conf/context.xml is like this:
<!--
<Manager pathname="" />
-->
I think the problem is somewhat deeper. Because I can see from the logs that
sessions are replicated when I use BackupManager. I mean, I only change
DeltaManager to BackupManager, open 4 terminal and do
tail -f /var/tomcat$n/logs/localhost.2009-04-25.log
for each instance and
see the following message:
(instance 2)
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: sessionCreated('4A173B54F43792042A4FDB991D48C409.s2')
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: attributeAdded('4A173B54F43792042A4FDB991D48C409.s2',
'numguess', 'num.NumberGuessBean@4b2dd538')
(intance 4 log message)
INFO: SessionListener: attributeAdded('4A173B54F43792042A4FDB991D48C409.s2',
'numguess', 'num.NumberGuessBean@3c6833f2')
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@3c6833f2')
Apr 25, 2009 2:29:00 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@5d2a73d9')
Apr 25, 2009 2:29:01 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@e1bdb58')
Apr 25, 2009 2:29:01 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener:
attributeReplaced('4A173B54F43792042A4FDB991D48C409.s2', 'numguess',
'num.NumberGuessBean@46dd75a4')
---
(no log in instance 1 and 3)
First, BackupManager seems to select the backup node arbitrarly. In this
example, I created the session on jvmRoute s2, it replicated in on s4 which
seemed random to me. In order to eliminate this random behavior, I tried
switching to DeltaManager with exactly same configuration,
Here is the result:
(all instance logs shows this)
Apr 25, 2009 2:33:51 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: sessionCreated('3DA2A86518AC780A0832669D168B66FD.s2')
Apr 25, 2009 2:33:51 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: attributeAdded('3DA2A86518AC780A0832669D168B66FD.s2',
'numguess', 'num.NumberGuessBean@2fe6e305')
--
When I refresh the "jsp", I'm changing the session attribute because I can
see from the example:
[Good guess, but nope. Try lower. You have made 18 guesses.]
and balancer-manager shows
Worker URL Route RouteRedir Factor Set Status Elected To From
ajp://127.0.0.1:12001 s1 1 0 Ok 0 0 0
ajp://127.0.0.1:12002 s2 1 0 Ok 18 0 22K
ajp://127.0.0.1:12003 s3 1 0 Ok 0 0 0
ajp://127.0.0.1:12004 s4 1 0 Ok 0 0 0
But there is nothing in the log as the one in BackupManager
(attributeReplaced..)
So, normally, when I disable "s2" route, session should continue, I must see
the "counter" in the jsp increasing, but it starts over.
Thank you.
(sorry for typos)
Robin Wilson-5 wrote:
>
> Did you comment out the <Manager pathname="" /> line in 'context.xml'? If
> you leave that it, it doesn't use the manager you defined for the cluster.
>
> Also, is your web app defined as '<distributable />' in the 'web.xml' file
> from the webapp dir?
>
>
> --
> Robin D. Wilson
> Director of Web Development
> KingsIsle Entertainment, Inc.
> WORK: 512-623-5913
> CELL: 512-426-3929
> www.KingsIsle.com
>
>
>
> -----Original Message-----
> From: Kursat Tuncel [mailto:kursat.tuncel@gmail.com]
> Sent: Friday, April 24, 2009 6:12 PM
> To: users@tomcat.apache.org
> Subject: Problem with DeltaManager & BackupManager
>
>
> Hi All,
>
> I'm trying to setup a Tomcat Cluster configuration by using the example
> provided in http://www.mbaworld.com/docs/cluster-howto.html
>
> My problem is actually a bit strange. I've been digging the problem for 2
> days but no success.
>
> Here is my configuration:
>
> 4 Tomcat instances on the same machine, version 6.0.18
> I'm using apache as the http connector, version Apache/2.2.11.
>
> Here is my httpd.conf:
> [...]
> <Proxy balancer://ajpCluster>
> BalancerMember ajp://127.0.0.1:12001 route=s1
> BalancerMember ajp://127.0.0.1:12002 route=s2
> BalancerMember ajp://127.0.0.1:12003 route=s3
> BalancerMember ajp://127.0.0.1:12004 route=s4
> </Proxy>
> <Location /examples>
> ProxyPass balancer://ajpCluster/examples stickysession=JSESSIONID
> </Location>
> [...]
>
> Here are the 4 tomcat instances seperate config file
> (each located in /var/tomcat[1-n] as CATALINA_BASE, properly configure
> startup/shutdown scripts, ports etc.)
>
> ---
> <Engine name="Catalina" defaultHost="localhost" jvmRoute="s1">
>
> <!-- The request dumper valve dumps useful debugging information
> about
> the request and response data received and sent by Tomcat.
> Documentation at: /docs/config/valve.html -->
>
> <!--
> <Valve className="org.apache.catalina.valves.RequestDumperValve"/>
> -->
>
> <!-- This Realm uses the UserDatabase configured in the global JNDI
> resources under the key "UserDatabase". Any edits
> that are performed against this UserDatabase are immediately
> available for use by the Realm. -->
> <Realm className="org.apache.catalina.realm.UserDatabaseRealm"
> resourceName="UserDatabase"/>
>
> <!-- Define the default virtual host
> Note: XML Schema validation will not work with Xerces 2.2.
> -->
> <Host name="localhost" appBase="webapps"
> unpackWARs="true" autoDeploy="true"
> xmlValidation="false" xmlNamespaceAware="false">
>
> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
> channelSendOptions="8">
>
> <Manager className="org.apache.catalina.ha.session.DeltaManager"
> expireSessionsOnShutdown="false"
> notifyListenersOnReplication="true"/>
>
> <Channel
> className="org.apache.catalina.tribes.group.GroupChannel">
> <Membership
> className="org.apache.catalina.tribes.membership.McastService"
> address="228.0.0.4"
> port="45564"
> frequency="500"
> dropTime="3000"/>
> <Receiver
> className="org.apache.catalina.tribes.transport.nio.NioReceiver"
> address="auto"
> port="14001"
> autoBind="100"
> selectorTimeout="5000"
> maxThreads="6"/>
>
> <Sender
> className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
> <Transport
> className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
> </Sender>
> <Interceptor
> className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
> <Interceptor
> className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
> </Channel>
>
> <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
> filter=""/>
> <Valve
> className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
>
> <Deployer
> className="org.apache.catalina.ha.deploy.FarmWarDeployer"
> tempDir="/tmp/war-temp/"
> deployDir="/tmp/war-deploy/"
> watchDir="/tmp/war-listen/"
> watchEnabled="false"/>
>
> <ClusterListener
> className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
> <ClusterListener
> className="org.apache.catalina.ha.session.ClusterSessionListener"/>
> </Cluster>
> </Host>
> </Engine>
> ---
>
> jvmRoute value and NioReceiver port value is 1-n for all 4 tomcat
> instances
> (i.e., s1, s2, s3, s4 and
> 14001, 14002, 14003, 14004 for the instances)
>
>
> Theoretically, this configuration should work.
>
> I deployed "examples" application provided in tomcat examples and made it
> "</distributable>" in web.xml of the application. I also used "Number
> guess"
> game provided in examples application. I had to modify NumGuessBean.java
> to
> implement java.io.Serializable.
>
> So my setup seems ok upto now.
>
> When I start tomcat instances, and run the example, I see from the
> localhost.xxx.log that session is created on all nodes.
>
> i.e.
> ..
> INFO: SessionListener:
> sessionCreated('78C5694D20B69F54D5CEBD26F10D788D.s1')
> Apr 25, 2009 1:34:51 AM org.apache.catalina.core.ApplicationContext log
> INFO: SessionListener:
> attributeAdded('78C5694D20B69F54D5CEBD26F10D788D.s1',
> 'numguess', 'num.NumberGuessBean@19de0b5e')
> ..
>
> Now my problem starts where.
>
> When I start changing the value of session attribute by hitting "Refresh"
> button, I don't see any replication happenning. Normally, I should see
> "attributeReplaced" messages in the log. How to I know this, because
> exactly
> same configuration but using "BackupManager" instead of "DeltaManager" it
> happens exactly like this. But BackupManager only "backups" to one node to
> another, i.e., it replicates deltas between two instances only, and the
> choice of selecting this backupnode seems to be completely arbitrary.
> These
> is nothing in the documentation how backup node is selected.
>
> Also using balancer-manager handler in Apache, I disable the jvm instance
> that my session was created and redirect it to another JVM. With
> deltaManager, session start from beginning. With backup manager, session
> continues only if I can select the right jvm, that is the backup of the
> instance.
>
> So it seems that I'm stuck with setting up a cluster configuration.
>
> Has anyone tried Tomcat 6.0.18 with Apache 2.2.11, sticky session mode
> with
> mod_proxy_ajp?
>
> I'm stucked with this configuration.
> --
> View this message in context:
> http://www.nabble.com/Problem-with-DeltaManager---BackupManager-tp23226268p23226268.html
> Sent from the Tomcat - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
> For additional commands, e-mail: users-help@tomcat.apache.org
>
>
>
--
View this message in context: http://www.nabble.com/Problem-with-DeltaManager---BackupManager-tp23226268p23226529.html
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RE: Problem with DeltaManager & BackupManager
Posted by Robin Wilson <rw...@kingsisle.com>.
Did you comment out the <Manager pathname="" /> line in 'context.xml'? If you leave that it, it doesn't use the manager you defined for the cluster.
Also, is your web app defined as '<distributable />' in the 'web.xml' file from the webapp dir?
--
Robin D. Wilson
Director of Web Development
KingsIsle Entertainment, Inc.
WORK: 512-623-5913
CELL: 512-426-3929
www.KingsIsle.com
-----Original Message-----
From: Kursat Tuncel [mailto:kursat.tuncel@gmail.com]
Sent: Friday, April 24, 2009 6:12 PM
To: users@tomcat.apache.org
Subject: Problem with DeltaManager & BackupManager
Hi All,
I'm trying to setup a Tomcat Cluster configuration by using the example
provided in http://www.mbaworld.com/docs/cluster-howto.html
My problem is actually a bit strange. I've been digging the problem for 2
days but no success.
Here is my configuration:
4 Tomcat instances on the same machine, version 6.0.18
I'm using apache as the http connector, version Apache/2.2.11.
Here is my httpd.conf:
[...]
<Proxy balancer://ajpCluster>
BalancerMember ajp://127.0.0.1:12001 route=s1
BalancerMember ajp://127.0.0.1:12002 route=s2
BalancerMember ajp://127.0.0.1:12003 route=s3
BalancerMember ajp://127.0.0.1:12004 route=s4
</Proxy>
<Location /examples>
ProxyPass balancer://ajpCluster/examples stickysession=JSESSIONID
</Location>
[...]
Here are the 4 tomcat instances seperate config file
(each located in /var/tomcat[1-n] as CATALINA_BASE, properly configure
startup/shutdown scripts, ports etc.)
---
<Engine name="Catalina" defaultHost="localhost" jvmRoute="s1">
<!-- The request dumper valve dumps useful debugging information about
the request and response data received and sent by Tomcat.
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.valves.RequestDumperValve"/>
-->
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
<!-- Define the default virtual host
Note: XML Schema validation will not work with Xerces 2.2.
-->
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true"
xmlValidation="false" xmlNamespaceAware="false">
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="8">
<Manager className="org.apache.catalina.ha.session.DeltaManager"
expireSessionsOnShutdown="false"
notifyListenersOnReplication="true"/>
<Channel
className="org.apache.catalina.tribes.group.GroupChannel">
<Membership
className="org.apache.catalina.tribes.membership.McastService"
address="228.0.0.4"
port="45564"
frequency="500"
dropTime="3000"/>
<Receiver
className="org.apache.catalina.tribes.transport.nio.NioReceiver"
address="auto"
port="14001"
autoBind="100"
selectorTimeout="5000"
maxThreads="6"/>
<Sender
className="org.apache.catalina.tribes.transport.ReplicationTransmitter">
<Transport
className="org.apache.catalina.tribes.transport.nio.PooledParallelSender"/>
</Sender>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
</Channel>
<Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
filter=""/>
<Valve
className="org.apache.catalina.ha.session.JvmRouteBinderValve"/>
<Deployer
className="org.apache.catalina.ha.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>
<ClusterListener
className="org.apache.catalina.ha.session.JvmRouteSessionIDBinderListener"/>
<ClusterListener
className="org.apache.catalina.ha.session.ClusterSessionListener"/>
</Cluster>
</Host>
</Engine>
---
jvmRoute value and NioReceiver port value is 1-n for all 4 tomcat instances
(i.e., s1, s2, s3, s4 and
14001, 14002, 14003, 14004 for the instances)
Theoretically, this configuration should work.
I deployed "examples" application provided in tomcat examples and made it
"</distributable>" in web.xml of the application. I also used "Number guess"
game provided in examples application. I had to modify NumGuessBean.java to
implement java.io.Serializable.
So my setup seems ok upto now.
When I start tomcat instances, and run the example, I see from the
localhost.xxx.log that session is created on all nodes.
i.e.
..
INFO: SessionListener: sessionCreated('78C5694D20B69F54D5CEBD26F10D788D.s1')
Apr 25, 2009 1:34:51 AM org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: attributeAdded('78C5694D20B69F54D5CEBD26F10D788D.s1',
'numguess', 'num.NumberGuessBean@19de0b5e')
..
Now my problem starts where.
When I start changing the value of session attribute by hitting "Refresh"
button, I don't see any replication happenning. Normally, I should see
"attributeReplaced" messages in the log. How to I know this, because exactly
same configuration but using "BackupManager" instead of "DeltaManager" it
happens exactly like this. But BackupManager only "backups" to one node to
another, i.e., it replicates deltas between two instances only, and the
choice of selecting this backupnode seems to be completely arbitrary. These
is nothing in the documentation how backup node is selected.
Also using balancer-manager handler in Apache, I disable the jvm instance
that my session was created and redirect it to another JVM. With
deltaManager, session start from beginning. With backup manager, session
continues only if I can select the right jvm, that is the backup of the
instance.
So it seems that I'm stuck with setting up a cluster configuration.
Has anyone tried Tomcat 6.0.18 with Apache 2.2.11, sticky session mode with
mod_proxy_ajp?
I'm stucked with this configuration.
--
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