Description of the illustration read-through.jpg

The image shows four boxes that each represent a JVM in a Coherence cluster. Each JVM contains an application box and a near cache box. The near cache for JVM one and three contain: a local/logical cache box, and a partitioned cache box that contains a logical cache box. The near cache for JVM two and four contain: a local/logical cache box, and a partitioned cache box that contains a logical cache box together with a primary storage box and a backup box. Data is labeled A through D and is located in all the logical caches of each JVM. The application in JVM one is performing two get operations for data A and D. The application in JVM three is performing two get operation for data B and D. The get operations are performed on the logical cache of the respective JVMs. However, for data A and D, the data is first loaded into the local cache from primary storage, which gets the data from a database using a CacheLoader implementation.