Daniel M Garland wrote:
Thanks for the response
So is it better to have one cluster rather than one per host?
easier to manage and troubleshoot one cluster than many.
What about hosts that don't have clustering enabled?
that's not a problem, clustering only applies to webapps with the
<distributable/> element, if the all apps in a host are non clustered,
then no clustering will be applied.
Surely there are advantages with having a separate cluster, its
listening on a different address so it would have its own message
buffer etc.?
I see that as disadvantages, but thats a personal opinion.
My current config is roughly as follows : I have two clusters
transmitting on differnet multicast addresses (but on the same port)
while I am binding my TCP listener to the external IP of the Tomcat
server on a different port:
<Engine name="Catalina" defaultHost="localhost" jvmRoute="bulk">
...
<Host name="myvirtualhost.com" appBase="/var/webapps/domain.com"
unpackWars="true" autoDeploy="true">
...
<Cluster
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
expireSessionsOnShutdown="false"
useDirtyFlag="true"
notifyListenersOnReplication="true">
<Membership
className="org.apache.catalina.cluster.mcast.McastService"
mcastAddr="228.0.0.5"
mcastPort="45565"
mcastFrequency="500"
mcastDropTime="20000"/>
<Receiver
className="org.apache.catalina.cluster.tcp.ReplicationListener"
tcpListenAddress="10.78.1.32"
tcpListenPort="5000"
tcpSelectorTimeout="100"
tcpThreadCount="6"/>
<Sender
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
replicationMode="pooled"
ackTimeout="15000"
stateTransferTimeout="45"
waitForAck="true"/>
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.css;.*\.txt;"/>
<ClusterListener
className="org.apache.catalina.cluster.session.ClusterSessionListener"/>
</Cluster>
</Host>
<Host name="myothervirtualhost.com" appBase="/var/webapps/blah"
unpackWars="true" autoDeploy="true">
...
<Cluster
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster"
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
expireSessionsOnShutdown="false"
useDirtyFlag="true"
notifyListenersOnReplication="true">
<Membership
className="org.apache.catalina.cluster.mcast.McastService"
mcastAddr="229.0.0.5"
mcastPort="45565"
mcastFrequency="500"
mcastDropTime="20000"/>
<Receiver
className="org.apache.catalina.cluster.tcp.ReplicationListener"
tcpListenAddress="10.78.1.32"
tcpListenPort="5100"
tcpSelectorTimeout="100"
tcpThreadCount="6"/>
<Sender
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
replicationMode="pooled"
ackTimeout="15000"
waitForAck="true"/>
<Valve
className="org.apache.catalina.cluster.tcp.ReplicationValve"
filter=".*\.gif;.*\.js;.*\.jpg;.*\.png;.*\.css;.*\.txt;"/>
<ClusterListener
className="org.apache.catalina.cluster.session.ClusterSessionListener"/>
</Cluster>
</Host>
...
</Engine>
Is there anything amiss with this configuration that would result in
the problems I am seeing?
shouldn't be, unless you have some rogue instances running somewhere
with the same config
Filip
Thanks
Dan
Filip Hanik - Dev Lists wrote:
it would have to be the multicast address that is unique to take care
of the problem, however, easier to run one cluster instance at the
engine level, the cluster knows what vhost a piece of replicated data
belongs to
Filip
Daniel M Garland wrote:
OK I've figured out what's happening, but not how to fix it!
I'm running a single Tomcat instance that is hosting some virtual
hosts, and we have three Tapestry web applications. For those
unfamiliar with Tapestry, a Visit object is defined to represent the
user's session and is sort of a facade to avoid working directly
with HttpSession. Hence in a cluster this Visit object is propagated
around the cluster.
Now, what seems to be the case is that Tomcat is getting muddled up
with the different Visit classes in each separate application; which
is not good. Not only are the classes in different java packages,
but they have unique serialVersionIDs. This then gives me the error:
java.io.InvalidClassException: com.mydomain.Visit; local class
incompatible: stream classdesc serialVersionUID = -139355480
5485899996, local class serialVersionUID = 8444624889687850885
and it turns out that -1393554805485899996 is the Visit object from
a completely different web application.
I'm trying to figure out what changes to my config I made when I
went from my old hardware to a new setup, and I believe that the
only change is that we configured each virtual host to use its own
<cluster> element, rather than having a single cluster for the
engine; but I would've thought that having three seperate clusters
on different ports/ addresses would help to prevent this sort of
thing happening, rather than cause it?
Any other reasons why my serialized objects are being confused in
this way?
Daniel M Garland wrote:
Hi all,
I've been running two Tomcat 5.5.20 servers in a cluster for some
time on Mac OSx but we've recently moved to 64-bit architecture
(Debian etch) . I tried as far as possible to keep the config the
same, so only the OS has changed (and I also got the Apache
Portable Runtime going). However since moving to this new setup I'm
starting to see the following messages in my catalina.out:
25-Sep-2007 16:35:11
org.apache.catalina.cluster.session.DeltaManager messageReceived
SEVERE: Manager []: Unable to receive message through TCP channel
java.lang.ClassNotFoundException:
com.mycompany.someSerialiazbleObject
and sometimes in other web apps I see instead of
ClassNotFoundException:
java.io.InvalidClassException:
org.mycomapny.someOtherSerializableObject; local class
incompatible: stream classdesc serialVersionUID =
-1393554805485899996, local class serialVersionUID =
8444624889687850885
Now I did some homework here and I've tried the following without
success:
1) I've compiled the java files on the server's themselves, so I am
sure that the correct class versions are being used
2) The object implements java.io.Serializable, and has a generated
serial ID from Eclipse. Incidentally, this Long value matches the
local class serialVersionUID, so I have no idea where the 'stream'
serialVersionUID comes from.
3) I have the same code running on both the Tomcat servers.
What I would like to know is where I am supposed to look next for
some answers to this problem. Is there any more information from my
config that would be relevant to post here?
Thanks in advance, my first 'tomcat-users' post :)
Dan Garland
[EMAIL PROTECTED]
-- Stack Trace --
25-Sep-2007 16:35:11
org.apache.catalina.cluster.session.DeltaManager messageReceived
SEVERE: Manager []: Unable to receive message through TCP channel
java.lang.ClassNotFoundException:
com.mycompany.someSerialiazbleObject
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
at
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:242)
at
java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:574)
at
org.apache.catalina.cluster.session.ReplicationStream.resolveClass(ReplicationStream.java:84)
at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538)
at
java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
at
org.apache.catalina.cluster.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:334)
at
org.apache.catalina.cluster.session.DeltaRequest.readExternal(DeltaRequest.java:246)
at
org.apache.catalina.cluster.session.DeltaManager.loadDeltaRequest(DeltaManager.java:697)
at
org.apache.catalina.cluster.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1572)
at
org.apache.catalina.cluster.session.DeltaManager.messageReceived(DeltaManager.java:1522)
at
org.apache.catalina.cluster.session.DeltaManager.messageDataReceived(DeltaManager.java:1271)
at
org.apache.catalina.cluster.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:85)
at
org.apache.catalina.cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:1167)
at
org.apache.catalina.cluster.tcp.ClusterReceiverBase.messageDataReceived(ClusterReceiverBase.java:426)
at
org.apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:107)
at
org.apache.catalina.cluster.tcp.TcpReplicationThread.drainChannel(TcpReplicationThread.java:138)
at
org.apache.catalina.cluster.tcp.TcpReplicationThread.run(TcpReplicationThread.java:69)
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