cluster problems: memberDisappeared errors

[Joshua Szmajda <jo...@loki.ws>]

I'm using the cluster fix patch on 5.5.9 (from 
http://issues.apache.org/bugzilla/show_bug.cgi?id=34389) with 8 hosts 
clustered together. I was seeing alot
of memberDisappeared errors before I applied this patch, now I'm still 
seeing them, but with more detail.
Here's an example error from catalina.out:

Jul 18, 2005 5:40:51 PM org.apache.catalina.cluster.tcp.SimpleTcpCluster 
memberDisappeared
INFO: Received member 
disappeared:org.apache.catalina.cluster.mcast.McastMember[tcp://10.0.0.15:4002,10.0.0.15,4002, 
alive=1018550]
Jul 18, 2005 5:40:51 PM org.apache.catalina.cluster.tcp.DataSender 
pushMessage
INFO: resending 782 bytes to 10.0.0.15:4002 from 55784 
java.net.SocketException: Socket closed
        at java.net.SocketInputStream.read(SocketInputStream.java:162)
        at java.net.SocketInputStream.read(SocketInputStream.java:182)
        at 
org.apache.catalina.cluster.tcp.DataSender.waitForAck(DataSender.java:542)
        at 
org.apache.catalina.cluster.tcp.DataSender.pushMessage(DataSender.java:504)
        at 
org.apache.catalina.cluster.tcp.FastAsyncSocketSender$FastQueueThread.run(FastAsyncSocketSender.java:401)

A typical cluster config is:
        <Cluster 
className="org.apache.catalina.cluster.tcp.SimpleTcpCluster" 
name="hydraNation"
                 
managerClassName="org.apache.catalina.cluster.session.DeltaManager"
                 expireSessionsOnShutdown="false"
                 useDirtyFlag="true"
                 notifyListenersOnReplication="true">

            <Membership
                className="org.apache.catalina.cluster.mcast.McastService"
                mcastAddr="228.0.0.4"
                mcastPort="45564"
                mcastFrequency="700"
                mcastDropTime="5000"/>

            <Receiver
                
className="org.apache.catalina.cluster.tcp.Jdk13ReplicationListener"
                tcpListenAddress="10.0.0.12"
                compress="false"
                tcpListenPort="4002"
                />

            <Sender
                  
className="org.apache.catalina.cluster.tcp.ReplicationTransmitter"
                  replicationMode="fastasyncqueue"
                  compress="false"
                  doProcessingStats="true"
                  queueTimeWait="true"
                  maxQueueLength="1000"
                  queueDoStats="true"
                  queueCheckLock="true"
                  ackTimeout="15000"
                  waitForAck="true"
                  autoConnect="false"
                  keepAliveTimeout="@node.ackTimeout@"
                  keepAliveMaxRequestCount="-1"/>

            <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"/>
        </Cluster>


any ideas? I'm thinking there's something wrong with my multicast setup, 
but everything was working fine this morning... The servers are running 
RHEL3, all 2 way AMD64 machines with 4Gb ram each. They each have two 
network interfaces, each eth0 is connected to one gigabit switch, each 
eth1 to another (internal) gigabit switch. I don't think I should be 
hitting any network bottlenecks.. ? There is alot of load on the site 
being served in general, but no big jump in hits today.

Should I be using a fastasyncqueue? What are the tradeoffs in Sender modes?

Thanks in advance!

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