More findings from porting further tests over to the Infinispan cache provider. The following log snippet shows a call to putForExternalRead() resulting on an invalidation and that, according to the Cache API, should not happen:

2009-08-20 10:26:23,437 6311 TRACE [org.infinispan.interceptors.InvocationContextInterceptor] (main Invoked with command PutKeyValueCommand

{key=KEY4, value=VALUE1, putIfAbsent=true, lifespanMillis=-1, maxIdleTimeMillis=100000} and InvocationContext [NonTxInvocationContext{flags=[ZERO_LOCK_ACQUISITION_TIMEOUT, FORCE_ASYNCHRONOUS, FAIL_SILENTLY]}]
2009-08-20 10:26:23,437 6311 TRACE [org.infinispan.factories.EntryFactoryImpl] (main Creating new entry.
2009-08-20 10:26:23,437 6311 TRACE [org.infinispan.util.concurrent.locks.LockManagerImpl] (main Attempting to lock KEY4 with acquisition timeout of 0 millis
2009-08-20 10:26:23,438 6312 TRACE [org.infinispan.interceptors.CallInterceptor] (main Executing command: PutKeyValueCommand{key=KEY4, value=VALUE1, putIfAbsent=true, lifespanMillis=-1, maxIdleTimeMillis=100000}

.
2009-08-20 10:26:23,438 6312 TRACE [org.infinispan.interceptors.LockingInterceptor] (main Number of entries in context: 1
2009-08-20 10:26:23,438 6312 TRACE [org.infinispan.container.entries.ReadCommittedEntry] (main Updating entry (key=KEY4 removed=false valid=true changed=true created=true value=VALUE1]
2009-08-20 10:26:23,439 6313 TRACE [org.infinispan.interceptors.LockingInterceptor] (main Releasing lock on [KEY4] for owner Thread[main,5,main]
2009-08-20 10:26:23,439 6313 TRACE [org.infinispan.util.concurrent.locks.LockManagerImpl] (main Attempting to unlock KEY4
2009-08-20 10:26:23,439 6313 DEBUG [org.infinispan.interceptors.InvalidationInterceptor] (main Cache [localhost.localdomain-11442] replicating InvalidateCommand

{keys=[KEY4]}
2009-08-20 10:26:23,439 6313 TRACE [org.infinispan.remoting.rpc.RpcManagerImpl] (main localhost.localdomain-11442 broadcasting call InvalidateCommand{keys=[KEY4]}

to recipient list null
2009-08-20 10:26:23,440 6314 TRACE [org.infinispan.remoting.transport.jgroups.JGroupsTransport] (main dests=null, command=SingleRpcCommand{cacheName='test/com.foo.test', command=InvalidateCommand{keys=[KEY4]}}, mode=ASYNCHRONOUS, timeout=20000