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Posted to users@tomcat.apache.org by Christopher Schultz <ch...@christopherschultz.net> on 2018/08/15 19:55:17 UTC
Re: [OT] Tomcat Clustering Support
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Scott,
This list is typically for non-paid support requests, but there really
isn't a great forum for finding Tomcat consultants... other than
Google I suppose.
So I'm marking this Off-Topic and replying below.
On 8/15/18 3:43 PM, Scott Evans wrote:
> Our system is on Apache Tomcat Version 8.0.47. OS is Windows Server
> 2012 R2 Datacenter.
>
> We are looking for someone that may be interested in paid contract
> work to assist with troubleshooting and resolving a Tomcat
> clustering issue in our system.
>
> The system is composed of multiple Java PrimeFaces applications
> running in a clustered Tomcat environment which is experiencing
> occasional deadlocking issues from an unknown source requiring the
> Nodes to be cycled in order to resolve. The issue is only
> occurring in our Production environment and we've determined that
> the issues are occurring at random with the replication threads.
Is it feasible to disable clustering (session replication) completely
in your environment to determine whether the replication itself is the
problem, or perhaps the problem is elsewhere? Disabling clustering
should only degrade your service if (a) you aren't using
session-stickiness (which pretty much everyone should be using) and
(b) you expect a lot of fail-over and (c) it is unacceptable to have a
failed-over user lose their session information.
> We would need someone to help investigate our configuration and
> determine if there are any further changes that can be made to our
> system to catch these deadlock issues before they occur (requiring
> a Node cycle).
Can you post your cluster configuration from conf/server.xml, minus
any secrets that may be in there? If all configs are the same on each
node except for e.g. IP lists, feel free to just post a single one and
mention that the IPs are different.
It would be good to know how many nodes are clustered and the
replication strategy (e.g. delta versus back). The strategy will be
obvious from the configuration. You'll need to tell us the size of the
cluster... and perhaps the deployment model such as "all servers in
the same DC" or "50/50 split between primary DC and secondary DC", etc.
> Please let me know if you or someone you know may be interested or
> if you have further questions I can help answer.
- -chris
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Re: [OT] Tomcat Clustering Support
Posted by Jeff Crump <je...@gmail.com>.
Never mind. It's visible again.
On Tue, Aug 28, 2018, 2:35 PM Christopher Schultz <
chris@christopherschultz.net> wrote:
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> 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
> <https://events.static.linuxfound.org/sites/events/files/slides/TomcatCluster_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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> To unsubscribe, e-mail: users-unsubscribe@tomcat.apache.org
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>
>
RE: [OT] Tomcat Clustering Support
Posted by Mark Thomas <ma...@apache.org>.
On September 20, 2018 2:26:36 PM UTC, Scott Evans <se...@guilfordgroup.com> wrote:
>-----Original Message-----
>From: Scott Evans <se...@guilfordgroup.com>
>Sent: Monday, September 17, 2018 10:57 AM
>To: 'Tomcat Users List' <us...@tomcat.apache.org>;
>'users@tomcat.apache.org'
><us...@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
>
>-----BEGIN PGP SIGNED MESSAGE-----
>Hash: SHA256
>
>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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>
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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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RE: [OT] Tomcat Clustering Support
Posted by Scott Evans <se...@guilfordgroup.com>.
-----Original Message-----
From: Scott Evans <se...@guilfordgroup.com>
Sent: Monday, September 17, 2018 10:57 AM
To: 'Tomcat Users List' <us...@tomcat.apache.org>; 'users@tomcat.apache.org'
<us...@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
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
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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-----END PGP SIGNATURE-----
---------------------------------------------------------------------
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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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RE: [OT] Tomcat Clustering Support
Posted by Scott Evans <se...@guilfordgroup.com>.
-----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
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
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
---------------------------------------------------------------------
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Re: [OT] Tomcat Clustering Support
Posted by Christopher Schultz <ch...@christopherschultz.net>.
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
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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RE: [OT] Tomcat Clustering Support
Posted by Scott Evans <se...@guilfordgroup.com>.
Scott Evans, PMP
Senior Manager
sevans@guilfordgroup.com
GUILFORD GROUP
business driven software solutions
P 317.814.1035 ext. 222 F 317.814.1044
615 West Carmel Drive, Suite 130
Carmel, IN 46032
-----Original Message-----
From: Christopher Schultz <ch...@christopherschultz.net>
Sent: Wednesday, August 15, 2018 3:55 PM
To: users@tomcat.apache.org
Subject: Re: [OT] Tomcat Clustering Support
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256
Scott,
This list is typically for non-paid support requests, but there really isn't
a great forum for finding Tomcat consultants... other than Google I suppose.
So I'm marking this Off-Topic and replying below.
On 8/15/18 3:43 PM, Scott Evans wrote:
> Our system is on Apache Tomcat Version 8.0.47. OS is Windows Server
> 2012 R2 Datacenter.
>
> We are looking for someone that may be interested in paid contract
> work to assist with troubleshooting and resolving a Tomcat clustering
> issue in our system.
>
> The system is composed of multiple Java PrimeFaces applications
> running in a clustered Tomcat environment which is experiencing
> occasional deadlocking issues from an unknown source requiring the
> Nodes to be cycled in order to resolve. The issue is only occurring
> in our Production environment and we've determined that the issues are
> occurring at random with the replication threads.
Is it feasible to disable clustering (session replication) completely in
your environment to determine whether the replication itself is the problem,
or perhaps the problem is elsewhere? Disabling clustering should only
degrade your service if (a) you aren't using session-stickiness (which
pretty much everyone should be using) and
(b) you expect a lot of fail-over and (c) it is unacceptable to have a
failed-over user lose their session information.
> We would need someone to help investigate our configuration and
> determine if there are any further changes that can be made to our
> system to catch these deadlock issues before they occur (requiring a
> Node cycle).
Can you post your cluster configuration from conf/server.xml, minus any
secrets that may be in there? If all configs are the same on each node
except for e.g. IP lists, feel free to just post a single one and mention
that the IPs are different.
It would be good to know how many nodes are clustered and the replication
strategy (e.g. delta versus back). The strategy will be obvious from the
configuration. You'll need to tell us the size of the cluster... and perhaps
the deployment model such as "all servers in the same DC" or "50/50 split
between primary DC and secondary DC", etc.
> Please let me know if you or someone you know may be interested or if
> you have further questions I can help answer.
- -chris
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----------------------------------------------------------------------------------------------------
Please see server.xml contents below.
--We have 4 nodes in the clustered environment
--Add nodes are in the same DC
---start server.xml---
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licensaes this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License aat
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
-->
<Server port="8005" shutdown="SHUTDOWN">
<Listener className="org.apache.catalina.startup.VersionLoggerListener" />
<!-- Security listener. Documentation at /docs/config/listeners.html
<Listener className="org.apache.catalina.security.SecurityListener" />
-->
<!--APR library loader. Documentation at /docs/apr.html -->
<Listener className="org.apache.catalina.core.AprLifecycleListener"
SSLEngine="on" />
<!-- Prevent memory leaks due to use of particular java/javax APIs-->
<Listener
className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener
className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
<Resource
type="javax.sql.DataSource"
name="jdbc/M2_datasource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="com.ibm.as400.access.AS400JDBCDriver"
url="jdbc:as400://AS400A;naming=system;libraries="
username=""
password=""
validationQuery="SELECT 1 from SYSIBM.SYSDUMMY1"
validationInterval="30000"
testWhileIdle="true"
testOnBorrow="false"
testOnReturn="false"
maxActive="400"
minIdle="0"
maxIdle="5"
maxWait="30000"
initialSize="0"
removeAbandoned="true"
removeAbandonedTimeout="60"
minEvictableIdleTimeMillis="300000"
logAbandoned="true"
/>
<Resource
type="javax.sql.DataSource"
name="jdbc/M1_M3_X1_datasource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="com.ibm.as400.access.AS400JDBCDriver"
url="jdbc:as400://AS400A;naming=system;"
username=""
password=""
validationQuery="SELECT 1 from SYSIBM.SYSDUMMY1"
validationInterval="30000"
testWhileIdle="true"
testOnBorrow="false"
testOnReturn="false"
maxActive="400"
minIdle="0"
maxIdle="5"
maxWait="30000"
initialSize="0"
removeAbandoned="true"
removeAbandonedTimeout="60"
minEvictableIdleTimeMillis="300000"
logAbandoned="true"
/>
<Resource
type="javax.sql.DataSource"
name="jdbc/keycloak_datasource"
factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://t"
username=""
password=""
validationQuery="/* ping */ SELECT 1"
validationInterval="30000"
testWhileIdle="true"
testOnBorrow="false"
testOnReturn="false"
maxActive="10"
minIdle="0"
maxIdle="1"
maxWait="30000"
initialSize="0"
removeAbandoned="true"
removeAbandonedTimeout="60"
minEvictableIdleTimeMillis="300000"
logAbandoned="true"
/>
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--The connectors can use a shared executor, you can define one or more
named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking &
non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL/TLS HTTP/1.1 Connector on port 8080
-->
<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
-->
<!-- Define a SSL/TLS HTTP/1.1 Connector on port 8443
This connector uses the NIO implementation that requires the JSSE
style configuration. When using the APR/native implementation, the
OpenSSL style configuration is required as described in the
APR/native
documentation -->
<!--
<Connector port="8443"
protocol="org.apache.coyote.http11.Http11NioProtocol"
maxThreads="150" SSLEnabled="true" scheme="https"
secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8009"
protocol="AJP/1.3"
redirectPort="8443"
maxPostSize="16777216"
maxSavePostSize="-1"
connectionTimeout="120000"
keepAliveTimeout="120000"
acceptorThreadCount="2" maxThreads="1024" acceptCount="200"
minSpareThreads="20"
/>
<!-- An Engine represents the entry point (within Catalina) that
processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes
them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Catalina2" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina" defaultHost="localhost" jvmRoute="tomcatnode3">
<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.PooledParallelSender"
timeout="8000" poolSize="25"
/>
</Sender>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor"/>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.TcpFailureDetector"/>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.MessageDispatch15Interceptor"/>
<Interceptor
className="org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor">
<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>
<!-- Use the LockOutRealm to prevent attempts to guess user passwords
via a brute-force attack -->
<Realm className="org.apache.catalina.realm.LockOutRealm">
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<!-- SingleSignOn valve, share authentication between web
applications
Documentation at: /docs/config/valve.html -->
<!--
<Valve className="org.apache.catalina.authenticator.SingleSignOn" />
-->
<!-- Access log processes all example.
Documentation at: /docs/config/valve.html
Note: The pattern used is equivalent to using
pattern="common" -->
<Valve className="org.apache.catalina.valves.AccessLogValve"
directory="logs"
prefix="localhost_access_log" suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
<Context docBase="C:/tomcatnode3/logs" path="/tomcatnode3_logs"
crossContext="false" debug="0" reloadable="true" privileged="true" />
</Host>
</Engine>
</Service>
</Server>
-----end server.xml-------
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