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Overflow has different potential requirements hence it is an open question as to whether is should be included in the pluggable interface. While one can see storage class memory (SCM) used for overflow this type of memory is likely to be exposed as a file system interface similar to any other disk. It is difficult to imagine other types of storage being used for overflow due to performance and latency requirements. The main use case seems to be for those using proprietary SCM interfaces to provide very fast low latency overflow. The open questions are (1) should overflow be included? (2) what is the incremental increase to the difficulty of implementation of pluggable stores by including overflow? (3) are the requirements similar enough to combine persistence and overflow, or should overflow, if done, be a separate proposal?

Technical Proposal

Technical proposal is added at 

https://cwiki.apache.org/confluence/display/GEODE/Proposal+for+pluggable+cache+storesComing soon...