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distributed caching with ehcache

Sven Anderson
Ranch Hand

Joined: Apr 14, 2004
Posts: 58

I'm having a few question about configurating ehcache for distributed cache replication.

I'm currently configurating cache replication (ehcache 1.4.1) between two servers using manual peer discovery over RMI(see config below).

I'm a bit confused about the output of the log files from the two servers in the following scenario:

step1: ServerA: User adds and object to cache. ServerB writes the following output to its log
DEBUG [net.sf.ehcache.distribution.RMICachePeer] - Remote put received. Element is: [ key = 1234, value=net.xzy.AnonymousCookieEntry@83c3cbfe, version=1221936368875, hitCount=0, CreationTime = 1221936356123, LastAccessTime = 0 ]

step2: ServerA: User request the object from step1 which is now in the cache (performing an element.getValue()). ServerB writes the following output to its log
DEBUG [net.sf.ehcache.distribution.RMICachePeer] - Remote remove received for key: 1234

step3: ServerA: User request the same object from step1 and get it from cache. ServerB now output the following.
DEBUG [] - net.xzy.ANONYMOUS_USER_CACHECache: Cannot remove entry as key 1234 was not found

I don't understand why ServerB in step2 performs a "Remote remove received". Is this the reason it can't find the cache key in step3? My understanding is that both servers should keep the cache objects in sync.


<cache name="net.xzy.ANONYMOUS_USER_CACHE"
maxElementsInMemory="10000" eternal="true" overflowToDisk="false"
properties="replicateAsynchronously=true, replicatePuts=true, replicateUpdates=true,
replicateUpdatesViaCopy=false, replicateRemovals=true "/>


I agree. Here's the link:
subject: distributed caching with ehcache