[jboss-user] [JBoss Cache: Core Edition] - Re: Should be able to use ClusteredCacheLoader with CacheMod

[manik.surtani@jboss.com]

"lovelyliatroim" wrote : 
  | 
  | Now take sequence of events as follows
  | 1. Node A receives request for data item X
  | 2. Data Item X, not there, retrieve from source and place in cache.
  | 3. 14 mins later Node B is asked for data item X,it doesnt have it but node A does and is replicated on B via CCL.
  | 4. Data Item X is removed from the cache on node A because its 15 minute lifetime expectancy is up.
  | 5. Node A receives request for data item X,it doesnt have it but node B does. data Item is replicated on to A via CCL. So actually data item X is older than 15 minutes in reality.
  | 
  | Can the above scenario happen? Will node A keep data Item X for another 15 mins and also have the possibility of the cycle continuing or does NODE B when it receives data Item X know that it must be evicted in 1 minutes time??
  | 
  | So does jboss cache replicate the timestamp of a data item if it is replicated from one node to another via CCL??
  | 
  | if not as a possible solution to achieve this could one write their own eviction policy and use an internal ID(member variable) that is transferred from node to node?
  | 
  | 

This depends on which eviction policy you use.  If you use the expiration policy, the expiry time is encoded as data on a node which means it will replicate to B and get evicted at the appropriate time.

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