Hi Niall, Thanks for your confirmation of behaviour. Do you know if this is true with JCS 1.2.7.9? What version are you running?
Thanks, Simon -----Original Message----- From: Niall Gallagher [mailto:[EMAIL PROTECTED] Sent: Friday, August 29, 2008 3:43 PM To: JCS Users List Subject: Re: Remote Cache - Understanding remove method call propagation? Hi Simon, Answer: (3) Remove events are propagated to the remote server (which in turn propagates them to other clients) even if the server which initiated the remove for that key didn't actually have the object stored against the key in its own local memory at the time. So basically a client which does not actually have an object in its own memory, can remove such objects from other clients' memories as long as it has the key. This behaviour is configurable I think, but I'm not sure exactly which setting enables it. We rely on this behaviour in our company so I know it works. Aaron is the expert on all things JCS so he might jump in to confirm/deny this. Anyway- you should test this in your own environment. FYI here's our remote server settings... jcs.auxiliary.remotecache=org.apache.jcs.auxiliary.remote.RemoteCacheFac tory jcs.auxiliary.remotecache.attributes=org.apache.jcs.auxiliary.remote.Rem oteCacheAttributes jcs.auxiliary.remotecache.attributes.FailoverServers=ip.ip.ip.ip:port jcs.auxiliary.remotecache.attributes.GetOnly=false jcs.auxiliary.remotecache.attributes.Receive=true jcs.auxiliary.remotecache.attributes.RemoveUponRemotePut=true Best regards, Niall On Fri, 2008-08-29 at 15:05 +0100, Horton Simon wrote: > Hi JCS Gurus, > > I have two tomcat servers, server A and server B both running their own > local JCS cache. Each local JCS cache is connected to the same Remote > auxiliary cache (two remote caches operating in a cluster). > > So, normal remote cache operation is along the lines of: If server A > puts an object in its local cache, with key 1, the object will propagate > to the remote cache, so if server B tries to get the object with key 1 > from its local cache, it will not find it, then it tries the remote > cache for key 1 where it finds the object in the remote cache, so return > this, storing it in server B's local cache. > > How about this... > If server A puts an object in its local cache, with key 1, the object > will propagate to the remote cache. If server B does not have key 1 in > its local cache, but calls the remove method for key 1 on its local > cache..... > > What happens? > (1) Does the server B local JCS remove for key 1 do nothing because it > is not in the server B local cache. > > (2) Does the server B local JCS remove propagate to the remote cache > server, but the object for key 1 remains in the server A local cache. > > (3) Does the server B local JCS remove propagate to the remote cache > server, and the remove propagates to the server A local cache as well. > So, key 1 does not exist in any cache the next time get is called. > > I am after the functionality in (3) above, is this possible? > Below is some of my cache config file snippets in case this is helpful. > > Remote Cache Config Snippet > ########################### > jcs.auxiliary.RCluster1=org.apache.jcs.auxiliary.remote.RemoteCacheFacto > ry > jcs.auxiliary.RCluster1.attributes=org.apache.jcs.auxiliary.remote.Remot > eCacheAttributes > jcs.auxiliary.RCluster1.attributes.RemoteTypeName=CLUSTER > jcs.auxiliary.RCluster1.attributes.RemoveUponRemotePut=true > jcs.auxiliary.RCluster1.attributes.ClusterServers=localhost:1101,1103 > jcs.auxiliary.RCluster1.attributes.GetOnly=false > > Local Cache Config Snippet > ########################### > # - Remote RMI Cache set up to failover > jcs.auxiliary.RFailover=org.apache.jcs.auxiliary.remote.RemoteCacheFacto > ry > jcs.auxiliary.RFailover.attributes=org.apache.jcs.auxiliary.remote.Remot > eCacheAttributes > jcs.auxiliary.RFailover.attributes.FailoverServers=localhost:localhost:1 > 101, localhost:1103 > #jcs.auxiliary.RC.attributes.RemoveUponRemotePut=true > jcs.auxiliary.RFailover.attributes.RemoveUponRemotePut=true > jcs.auxiliary.RFailover.attributes.GetOnly=false > > > Thanks > Simon > > This message and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. 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