JBoss.org Community Documentation
The following figure shows 2 JBoss Cache instances sharing the same backend store:
Both nodes have a cache loader that accesses a common shared
backend store. This could for example be a shared filesystem (using
the FileCacheLoader), or a shared database. Because both nodes access
the same store, they don't necessarily need state transfer on
startup.
[6]
Rather, the
FetchInMemoryState
attribute could be set to false, resulting in a 'cold' cache, that
gradually warms up as elements are accessed and loaded for the first
time. This would mean that individual caches in a cluster might have
different in-memory state at any given time (largely depending on
their preloading and eviction strategies).
When storing a value, the writer takes care of storing the change in the backend store. For example, if node1 made change C1 and node2 C2, then node1 would tell its cache loader to store C1, and node2 would tell its cache loader to store C2.
[6] Of course they can enable state transfer, if they want to have a warm or hot cache after startup.