for it to work you would need to have channelSendOptions="6", however,
not using sticky sessions is a bad strategy, no matter how you look at it.
using sticky sessions, one can take advantage of asynchronous messaging
and hence not affect the overall response time
and other benefits of course
Filip
Vreixo Formoso wrote:
Hi!
I've a session replication problem I don't know how to solve.
I've installed a tomcat cluster with 2 tomcat workers (v6.0.14) and an
apache server 2.2.3 as load balancer, with mod_jk.
I've configured DeltaManager for session replication. When I use sticky
sessions, all works propertly, when I stop one tomcat the other one
handles the session.
However, if I disable sticky sessions things change. As a first sight,
it seems to work ok. Each request is processed by a different tomcat,
sessions are replicated propertly. However, if I send several requests
too fast (well, not so fast, just clicking F5 in the web browser 1 or 2
times per second), after a short time the session is suddenly lost, and
a new session is created. May it be a session replication problem? I've
tried with several cluster->channelSendOptions but I always have the
same problem. Note that with sticky sessions in the load balancer the
problem does not exists. Any ideas?
Thank you in advance.
Cheers,
Vreixo Formoso
----------------- cluster config in server.xml ----------
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
channelSendOptions="4">
<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="4002"
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>
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