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IBM WebSphere eXtreme Scale 6 by Anthony Chaves

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Where does an IMDG fit?

We've used ObjectGrid to store all of our data so far. This diagram should look pretty familiar by now:

Where does an IMDG fit?

Because we're only using the ObjectGrid APIs, our data is stored in-memory. It is not persisted to disk. If our ObjectGrid servers crash, then our data is in jeopardy (we haven't covered replication yet). One way to get our data into a persistent store is to mark up our classes with some ORM framework like JPA. We can use the JPA API to persist, update, and remove our objects from a database after we perform the same operations on them using the ObjectMap or Entity APIs. The onus is on the application developer to keep ...

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