On September 20, 2018 2:26:36 PM UTC, Scott Evans <sev...@guilfordgroup.com>
wrote:
>-----Original Message-----
>From: Scott Evans <sev...@guilfordgroup.com>
>Sent: Monday, September 17, 2018 10:57 AM
>To: 'Tomcat Users List' <users@tomcat.apache.org>;
>'users@tomcat.apache.org'
><users@tomcat.apache.org>
>Subject: RE: [OT] Tomcat Clustering Support
>
>
>-----Original Message-----
>From: Christopher Schultz <ch...@christopherschultz.net>
>Sent: Tuesday, August 28, 2018 3:35 PM
>To: users@tomcat.apache.org
>Subject: Re: [OT] Tomcat Clustering Support
>
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>
>Scott,
>
>I'm no Tomcat-clustering expert, but...
>
>On 8/28/18 13:59, Scott Evans wrote:
>> <Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"
>> channelSendOptions="10" channelStartOptions="3">
>>
>> <Manager className="org.apache.catalina.ha.session.BackupManager"
>> expireSessionsOnShutdown="false"
>> notifyListenersOnReplication="true" mapSendOptions="10" />
>>
>> <Channel
>> className="org.apache.catalina.tribes.group.GroupChannel">
>> <Membership
>> className="org.apache.catalina.tribes.membership.McastService"
>> address="228.1.0.13" port="45522" frequency="500" dropTime="15000"
>> soTimeout="10000" domain="mercer"/> <Receiver
>> className="org.apache.catalina.tribes.transport.nio.NioReceiver"
>> address="10.255.250.34" port="4003" selectorTimeout="8000"
>> maxThreads="25" />
>>
>> <Sender
>>
>className="org.apache.catalina.tribes.transport.ReplicationTransmitter
>">
>>
>>
><Transport
>>
>className="org.apache.catalina.tribes.transport.nio.PooledParallelSend
>er"
>>
>>
>timeout="8000" poolSize="25"
>> /> </Sender> <Interceptor
>>
>className="org.apache.catalina.tribes.group.interceptors.TcpPingInterc
>eptor"/>
>>
>>
><Interceptor
>>
>className="org.apache.catalina.tribes.group.interceptors.TcpFailureDet
>ector"/>
>>
>>
><Interceptor
>>
>className="org.apache.catalina.tribes.group.interceptors.MessageDispat
>ch15Interceptor"/>
>>
>>
>>
>> <Interceptor
>>
>className="org.apache.catalina.tribes.group.interceptors.StaticMembers
>hipInterceptor">
>>
>> <LocalMember
>> className="org.apache.catalina.tribes.membership.StaticMember"
>> domain="mercer" uniqueId="{5,6,7,0,1,2,3,4,0,0,0,0,0,0,1,0}"/>
>>
>> <Member
>> className="org.apache.catalina.tribes.membership.StaticMember"
>> port="4001" host="10.255.250.35" domain="mercer"
>> uniqueId="{5,6,7,0,1,2,3,4,0,0,0,0,0,0,0,0}" />
>>
>> <Member
>> className="org.apache.catalina.tribes.membership.StaticMember"
>> port="4002" host="10.255.250.35" domain="mercer"
>> uniqueId="{5,6,7,0,1,2,3,4,0,0,0,0,0,0,0,1}" />
>>
>> <Member
>> className="org.apache.catalina.tribes.membership.StaticMember"
>> port="4004" host="10.255.250.34" domain="mercer"
>> uniqueId="{5,6,7,0,1,2,3,4,0,0,0,0,0,0,1,1}" />
>>
>> </Interceptor>
>>
>>
>> </Channel>
>>
>> <Valve className="org.apache.catalina.ha.tcp.ForceReplicationValve"
>> /> <Valve className="org.apache.catalina.ha.tcp.ReplicationValve"
>> filter=".*javax\.faces\.resource.*"/> <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.ClusterSessionListener"/>-->
>>
>>
></Cluster>
>
>It looks like you have both multicast AND static membership enabled.
>
>Keichi's presentation on Clustering at ApacheCon Miami (2017) has a
>slide
>(it's slide #38 here:
>https://events.static.linuxfound.org/sites/events/files/slides/TomcatClu
>ster_3.pdf)
>that says that using static-membership requires that you disable
>multicast.
>
>Also, just confirming that you have two Tomcat nodes on one IP address
>(10.255.250.35, ports 4001 and 4002).
>
>Can you post a thread dump of a deadlock situation? Only the deadlocked
>threads should really be necessary to post. Can you replicate the
>deadlock
>without using your own full application? That is, can you create a
>simple
>application that can be used to reproduce this on a
>similarly-configured
>test instance (cluster) of Tomcat nodes?
>
>- -chris
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>
>Hi Chris,
>
>Just getting back to this. Thanks for the info on static membership
>and
>multicast, we may give that a try. We've also finally been able to get
>a
>thread dump of a recent deadlock situation that occurred which is good
>news.
>
>To answer your other questions, you are correct that two Nodes are on
>one IP
>and we do not have a way to create a simple program to reproduce the
>issue.
>It is just randomly occurring, though very infrequently.
>
>For next steps, due to the sensitive nature and voluminous amount of
>the
>data contained in the thread dump, we would ask that we somehow take
>this
>offline so it's not shared on the forums. Please let me know what our
>options would be for that.
>
>Thanks
>
>--------------------------
>
>Hi, just checking back in. Is there anyone who is willing to look at
>our
>thread dump on an individual basis to see what may be causing the
>deadlocks?
>We would rather not share it here since it contains sensitive
>information,
>thanks.
>
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You can mail it direct to me if you like.
Mark
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