Single Instance/Out-Process
A single instance can be an out-process cache that leaves on its own JVM typically in the same machine as the application server. This approach has also its benefits and cons. A typical example of an out of process cache can be using an instance of CouchDB for storage of your cache components and your applications talk to the cache via REST.

  • Still access is fast as it is in the same machine
  • Easy to setup and configure
  • Might require a windows or *nix service so the cache engine starts up with the machine
  • Can leverage its own JVM heap, memory, GC, etc and have more granularities.
  • Out of process cache servers can be clustered also to provide you with better redundancy. However, once you start clustering them, each of those servers will need a way to replicate and synchronize each other.

  • Still shares resources in the server
  • Limited scalability
  • Needs startup scripts
  • Needs a client of some sort to be installed in the application server so it can function and a protocol to talk to it: RMI, JMS, SOAP, REST, etc.
  • Not fault tolerant
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