On Fri, 2010-07-16 at 15:56 -0400, Christopher Schultz wrote:
> Luca,
>
> On 7/14/2010 2:42 AM, Luca Gervasi wrote:
> > i'm using (mostly):
>
> What does "(mostly)" mean? You have environments that sometimes deviate
> from this configuration? Sometimes you use another Tomcat and/or JDK
> just for fun?
With "mostly" i mean i handle several cluster rangeing from 5.x to
6.0.28. I'm interested in the 6.0.x trunk cluster capabilities and
handling (since are the one that i handle on my own).
> > Tomcat: 2.0.26
>
> No, you're not. Maybe 6.0.26?
Yes, my bad :) Tomcat 6.0.26.
> JDK: jdk1.6.0_18
>
> Ok.
>
> > I have clusters of 2-4 tomcats. Is there a way to verify that the
> > cluster is working?
>
> What do you define as a "cluster"? Are you just load-balancing between
> machines that aren't tied to each other in any way? Are you attempting
> to use distributable sessions?
> What component is "clusterizing" these machines? Do you have an lb out
> front, or Apache httpd + mod_jk/mod_proxy? These details are useful in
> helping you.
I use httpd + mod_jk as frontend to load balance among all the backends
(lb worker). The backends use the BackupManager to achieve
clusterization enclosed in the <Engine> tag.
> > I can see no message exchange. is there a way (even
> > some jsp code) to ensure that the cluster is working and the number of
> > nodes joining it?
>
> You may be able to verify that sessions are being distributed properly
> by modifying your own JSESSIONID cookie (or simply running with cookies
> disabled and then manually changing the 'jsessionid' parameter in the
> URL in order to force connection to a particular backend. Again, this
> depends entirely upon your lb strategy (which we don't know).
>
> > Furthermore...is there some debugging tool to see the cluster status?
>
> Logs certainly help. How about providing your startup log from catalina.out?
My Logs are strange. After a (successfull?) startup, i start getting some
errors that seems indicating a bad
clustering behavior:
----[ Successfull startup? This ip is other node's - this is a two nodes
cluster ]----
Jul 19, 2010 8:48:41 AM org.apache.catalina.ha.tcp.SimpleTcpCluster memberAdded
INFO: Replication member
added:org.apache.catalina.tribes.membership.MemberImpl[tcp://{172, 16, 35,
3}:8830,{172, 16, 35, 3},8830, alive=1040,id={55 -95 -24 -5 -91 -45 65 79 -93
18 68 -18 -30 84 -96 76 }, payload={}, command={}, domain={}, ]
----[ Strange errors ]----
Jul 19, 2010 8:47:33 AM org.apache.catalina.tribes.tipis.AbstractReplicatedMap
heartbeat
SEVERE: Unable to send AbstractReplicatedMap.ping message
org.apache.catalina.tribes.ChannelException: Sender not connected.; No faulty
members identified.
at
org.apache.catalina.tribes.transport.nio.PooledParallelSender.sendMessage(PooledParallelSender.java:45)
at
org.apache.catalina.tribes.transport.ReplicationTransmitter.sendMessage(ReplicationTransmitter.java:81)
at
org.apache.catalina.tribes.group.ChannelCoordinator.sendMessage(ChannelCoordinator.java:78)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.sendMessage(ChannelInterceptorBase.java:75)
at
org.apache.catalina.tribes.group.interceptors.ThroughputInterceptor.sendMessage(ThroughputInterceptor.java:61)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.sendMessage(ChannelInterceptorBase.java:75)
at
org.apache.catalina.tribes.group.interceptors.MessageDispatchInterceptor.sendMessage(MessageDispatchInterceptor.java:73)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.sendMessage(ChannelInterceptorBase.java:75)
at
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector.sendMessage(TcpFailureDetector.java:87)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.sendMessage(ChannelInterceptorBase.java:75)
at
org.apache.catalina.tribes.group.GroupChannel.send(GroupChannel.java:216)
at
org.apache.catalina.tribes.group.GroupChannel.send(GroupChannel.java:175)
at org.apache.catalina.tribes.group.RpcChannel.send(RpcChannel.java:89)
at
org.apache.catalina.tribes.tipis.AbstractReplicatedMap.ping(AbstractReplicatedMap.java:253)
at
org.apache.catalina.tribes.tipis.AbstractReplicatedMap.heartbeat(AbstractReplicatedMap.java:794)
at
org.apache.catalina.tribes.group.GroupChannel.heartbeat(GroupChannel.java:158)
at
org.apache.catalina.tribes.group.GroupChannel$HeartbeatThread.run(GroupChannel.java:661)
All this continues to be outputted unless i restart my nodes some _random_
times (I keep each istance down at least 1 hearthbeat long).
That's why i need to know if they are really "clustering". Is the errors
suppressed because they "works" or
because they "ultimately decided not to work at all" and just gave up?
> Also, make sure that you have logging.properties set up in a sane way,
> and that you can get debugging output from at least one component.
I don't have a logging.properties file. All the settings are "default".
Thanks very much for answering my question.
Luca Gervasi
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