Hello everybody,
First of all, to avoid any misunderstandings, below problems relate to
applications that I did not write, neither do I exactly know the
implementation of them. Although, if required, I can ask the programmer
for more information.
That being said, the problem that I am seeing is that the application
that I deployed on a Tomcat 5.5.27 cluster is not correctly handling
session replication. (The application works perfectly on a single
server).
The reason for thinking this is that the application fails, but only at
irregular intervals. When I press F5, then the page eventually comes
true. As said before, this does not happen in a single server
environment. According to the Tomcat logs, I can see that my request is
being served by Tomcat1 and by Tomcat2, and vice versa.
My server.xml configuration:
<Cluster className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
expireSessionsOnShutdown="false"
useDirtyFlag="true"
notifyListenersOnReplication="true"
clusterLog="true"
clusterLogName="clusterlog">
<Membership
className="org.apache.catalina.cluster.mcast.McastService"
mcastAddr="228.0.0.6"
mcastPort="45566"
mcastFrequency="500"
mcastDropTime="3000"/>
<Receiver
className="org.apache.catalina.cluster.tcp.ReplicationListener"
tcpListenAddress="172.18.0.39"
tcpListenPort="4001"
tcpSelectorTimeout="100"
tcpThreadCount="25"/>
<Sender
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
replicationMode="pooled"
ackTimeout="15000"
keepAliveTimeout="20000"
waitForAck="true"/>
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.htm;.*
\.html;.*\.css;.*\.txt;"/>
<!-- <Deployer
className="org.apache.catalina.cluster.deploy.FarmWarDeployer"
tempDir="/tmp/war-temp/"
deployDir="/tmp/war-deploy/"
watchDir="/tmp/war-listen/"
watchEnabled="false"/>-->
<ClusterListener
className="org.apache.catalina.cluster.session.ClusterSessionListener"/>
</Cluster>
Something interesting that I figured out is that if I change the
managerClass from
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
to
managerClassName="org.apache.catalina.cluster.session.SimpleTcpReplicationManager"
then the application works fine. (It keeps working when I set
useDirtyFlag to false).
One would think that the DeltaManager is just not replicating, but I can
see the following messages in catalina.out:
catalina.out:INFO: Manager[/Application1], requesting session state from
org.apache.catalina.cluster.mcast.McastMember[tcp://172.18.0.40:4001,catalina,172.18.0.40,4001,
alive=73627]. This operation will timeout if no session state has been
received within 60 seconds
catalina.out:INFO: Manager[/Application1], session state received in 104
ms.
Currently the only information that I have about the application is that
it's using JSF and session beans.
The developer said he does not need to explicitly put
session.SetAttribute(whatever), since this is automatically taken care
of by the session bean object. I'm not a Java programmer, so I'm not
sure whether that is correct.
I would really appreciate if someone could point me into the right
direction.
Btw. I cannot change the managerclass to SimpleTcpReplicationManager, as
I got other applications on the same server that start failing if that
manager is used.
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