We have a cluster in DIST mode with numOwners > 1, so there are primary and secondary owners, with persistence enabled. When I do a read-write operation on the cluster using the Functional API on a key that is present in the cache loader, the entry that gets passed to the functional operation has a non-null value only for the primary owner. See:

org.infinispan.interceptors.ClusteredCacheLoaderInterceptor.skipLoadForWriteCommand()
line 53.

This is using non-transactional cache.

NOTE: The attached tests are modified version of the ones in ISPN-6573.