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From Ossi <los...@gmail.com>
Subject BackupManager vs DeltaManager
Date Fri, 29 Oct 2010 10:17:35 GMT
Hi!

Should BackupManager work well with any number of nodes?
And with large clusters it should work even better than DeltaManager?

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;
    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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