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Date: Wed, 5 Oct 2011 11:21:51 -0700 (PDT)
From: Mark Eggers <its_toasted@yahoo.com>
Reply-To: Mark Eggers <its_toasted@yahoo.com>
Subject: Re: problem with session replication in tomcat 5.5.23
To: Tomcat Users List <users@tomcat.apache.org>
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----- Original Message -----=0A=0A> From: Gabriele Faelli <gabriele.faelli@=
gmail.com>=0A> To: users@tomcat.apache.org=0A> Cc: =0A> Sent: Wednesday, Oc=
tober 5, 2011 1:17 AM=0A> Subject: Re: problem with session replication in =
tomcat 5.5.23=0A> =0A> Really any idea?=0A> Il giorno 04/ott/2011 19:13, "G=
abriele Faelli" =0A> <gabriele.faelli@gmail.com>=0A> ha scritto:=0A>>  Hi a=
ll,=0A>>  I'm running tomcat 5.5.23 on two RHEL 5.6.=0A>>  I'm having big t=
rouble making the session replication working across =0A> these=0A>>  two n=
odes.=0A>>  I configured a cluster and it looks like working: each node dis=
covers the=0A>>  other one, I can see in the logs every received and transm=
itted ping.=0A>>  Well, when I create a session in the logs there are no me=
ntion of sessions=0A>>  being replicated and/or errors encounter while tryi=
ng.=0A>>  The applications running on tomcat have the <distributable/> entr=
y in=0A> their=0A>>  web.xml and this is the cluster config part of the ser=
ver.xml:=0A>> =0A>>  <Cluster =0A> className=3D"org.apache.catalina.cluster=
.tcp.SimpleTcpCluster"=0A>>  defaultMode=3D"true"=0A>> =0A>> =0A> managerCl=
assName=3D"org.apache.catalina.cluster.session.DeltaManager"=0A>>  manager.=
expireSessionsOnShutdown=3D"false"=0A>>  manager.useDirtyFlag=3D"false"=0A>=
>  manager.notifyListenersOnReplication=3D"true"=0A>>  manager.notifySessio=
nListenersOnReplication=3D"true"=0A>>  manager.sendAllSessions=3D"true">=0A=
>>  <Membership=0A>>  className=3D"org.apache.catalina.cluster.mcast.McastS=
ervice"=0A>>  mcastAddr=3D"228.0.0.4"=0A>>  mcastPort=3D"45564"=0A>>  mcast=
Frequency=3D"500"=0A>>  mcastDropTime=3D"3000"/>=0A>>  <Receiver=0A>>  clas=
sName=3D"org.apache.catalina.cluster.tcp.ReplicationListener"=0A>>  tcpList=
enAddress=3D"192.168.199.101"=0A>>  tcpListenPort=3D"4001"=0A>>  tcpSelecto=
rTimeout=3D"100"=0A>>  tcpThreadCount=3D"6"/>=0A>>  <Sender=0A>> =0A> class=
Name=3D"org.apache.catalina.cluster.tcp.ReplicationTransmitter"=0A>>  repli=
cationMode=3D"synchronous"=0A>>  ackTimeout=3D"15000"=0A>>  waitForAck=3D"t=
rue"=0A>>  autoConnect=3D"true"/>=0A>>  <Valve=0A>>  className=3D"org.apach=
e.catalina.cluster.tcp.ReplicationValve"=0A>> =0A>> =0A> filter=3D".*\.gif;=
.*\.js;.*\.jpg;.*\.png;.*\.htm;.*\.html;.*\.css;.*\.txt;"/>=0A>>  <Deployer=
=0A>>  className=3D"org.apache.catalina.cluster.deploy.FarmWarDeployer"=0A>=
>  tempDir=3D"/tmp/war-temp/"=0A>>  deployDir=3D"/tmp/war-deploy/"=0A>>  wa=
tchDir=3D"/tmp/war-listen/"=0A>>  watchEnabled=3D"false"/>=0A>> =0A>>  <Clu=
sterListener=0A>> =0A> className=3D"org.apache.catalina.cluster.session.Clu=
sterSessionListener"/>=0A>>  </Cluster>=0A>> =0A>>  Any Idea? Where I'm wro=
ng? I did something stupid for sure :)=0A>>  I tried every configuration, s=
uggest... well everything I found on the=0A>>  official an unofficial docum=
entation... I'm quite frustated :P=0A>>  Thanks in advance=0A>>  G.=0A>=0A=
=0AI'm by no means a clustering expert, and I've only run a 5.5.x (5.5.33) =
cluster on my local machine (Fedora 15). I was going to work on improving t=
he documentation (and my understanding), but since EOL for the 5.5.x series=
 is less than one year out that's fallen lower on my things to do list.=0A=
=0AA few things to check:=0A=0A1. Make sure all your session objects implem=
ent java.io.Serializable=0A=0A2. You have <distributable/> as the first lin=
e after <webapp> in your web.xml file=0A=0A3. Apparently (from the Tomcat d=
ocumentation) when you override any of the defaults you=A0=0A=A0 =A0have to=
 specify everything.=0A=0AThis has tripped me up in the past. I noticed for=
 example that your configuration appears to be missing a ClusterListener. T=
ry adding the following line to your cluster configuration after your other=
 ClusterListener.=0A=0A<ClusterListener=A0=0A=A0 className=3D"org.apache.ca=
talina.cluster.session.JvmRouteSessionIDBinderListener" />=0A=0A4. Make sur=
e that each Tomcat has a unique jvmRoute attribute on the Engine element=0A=
=0A5. Make sure your firewall is not blocking new connections on your tcpLi=
stenPort=0A=0A=0A6. Make sure that you're set up for multicasting on the pr=
oper interface (which it=0A=A0 =A0sounds=A0like you do)=0A=0ASo ifconfig <i=
nterface-name> should show in part:=A0UP BROADCAST RUNNING MULTICAST=0ASo i=
p route list should show something like:=A0multicast 224.0.0.0/4 dev eth0 s=
cope link=0A=0A7. Run something like Wireshark or tcpdump and watch for tra=
ffic on the tcpListenPort=0A=0A=0AItems 3 and 4 are for load balancing with=
 AJP (think mod_ajp and Apache HTTPD), so I don't know if it's necessary.=
=0A=0AI'm not sure how the FarmDeployer works. I have mine set up so it fun=
ctions, but there doesn't seem to be any documentation. The javadoc doesn't=
 seem to be internally consistent (I know, patches welcome). I've set my Fa=
rmDeployer up as follows:=0A=0AAdmin (or source) node:=0A=0A=A0 <Deployer c=
lassName=3D"org.apache.catalina.cluster.deploy.FarmWarDeployer"=0A =A0 =A0t=
empDir=3D"${catalina.base}/temp-dir/"=0A =A0 =A0deployDir=3D"${catalina.bas=
e}/webapps/"=0A =A0 =A0watchDir=3D"${catalina.base}/watch-dir/"=0A =A0 =A0w=
atchEnabled=3D"true"/>=0A=0AAll other (client) nodes:=0A=0A=A0 <Deployer cl=
assName=3D"org.apache.catalina.cluster.deploy.FarmWarDeployer"=0A=A0 =A0 =
=A0 =A0 =A0 =A0 tempDir=3D"${catalina.base}/temp-dir/"=0A=A0 =A0 =A0 =A0 =
=A0 =A0 deployDir=3D"${catalina.base}/webapps/"=0A=A0 =A0 =A0 =A0 =A0 =A0 w=
atchDir=3D"${catalina.base}/watch-dir/"=0A=A0 =A0 =A0 =A0 =A0 =A0 watchEnab=
led=3D"false"/>=0A=0AThis seems to work (auto-deploy, etc.), except that wh=
en I restart the cluster all of the applications in watchDir are deleted fr=
om deployDir and then redeployed.=0A=0AFinally, you can get some more loggi=
ng information by modifying $CATALINA_HOME/logging.properties. This might h=
elp in figuring out what's going on.=0A=0AHope this helps.=0A=0A. . . . jus=
t my two cents.=0A/mde/

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