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List:       tomcat-user
Subject:    Re: BackupManager vs DeltaManager
From:       Pid <pid () pidster ! com>
Date:       2010-10-29 10:51:45
Message-ID: 4CCAA741.9050208 () pidster ! com
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On 29/10/2010 11:17, Ossi wrote:
> Hi!
> 
> Should BackupManager work well with any number of nodes?

Yes.

> And with large clusters it should work even better than DeltaManager?

Yes.  *Should*.

> We have large production clusters (10+) nodes and we have evaluated if we
> can use BackupManager.
> 
> In test cluster of 6 nodes it didn't work too well: much higher request
> latency, with logs full of following errors:
> 
> 2010-09-24 14:17:34,536 ERROR [tomcat-processor-53]
> (org.apache.catalina.tribes.tipis.AbstractReplicatedMap) Unable to replicate
> out data for a LazyReplicatedMap.get
> operationorg.apache.catalina.tribes.ChannelException: Operation has timed
> out(3000 ms.).; Faulty members:tcp://{10, 1, 8, 219}:4200;

It's timing out for some reason.  You could try increasing the timeout.

Does this occur on all cluster members, or just a few?


p


> at
> org.apache.catalina.tribes.transport.nio.ParallelNioSender.sendMessage(ParallelNioSender.java:97)
>  
> at
> org.apache.catalina.tribes.transport.nio.PooledParallelSender.sendMessage(PooledParallelSender.java:53)
>  
> at
> org.apache.catalina.tribes.transport.ReplicationTransmitter.sendMessage(ReplicationTransmitter.java:80)
>  
> 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.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.get(AbstractReplicatedMap.java:844)
>  
> at
> org.apache.catalina.session.ManagerBase.findSession(ManagerBase.java:887)
> at org.apache.catalina.connector.Request.doGetSession(Request.java:2363)
> 
> at org.apache.catalina.connector.Request.getSession(Request.java:2098)
> at
> org.apache.catalina.connector.RequestFacade.getSession(RequestFacade.java:833)
> 
> at
> javax.servlet.http.HttpServletRequestWrapper.getSession(HttpServletRequestWrapper.java:216)
>  
> at
> com.sulake.habboweb.util.TomcatSessionFixationPreventerFilter$RequestWrapper.getSession(TomcatSessionFixationPreventerFilter.java:72)
>  
> .....
> 
> 
> Yes, I know that documentation says: "Downside of the BackupManager: not
> quite as battle tested as the delta manager". Maybe this is it. :)
> 
> Regards,
> Ossi
> 


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