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
