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When Geode was first developed as a technology storage was fairly straightforward--Disk was the persistent store. Today, however, we see an increasingly diverse storage environment. Distributed stores, such as HDFS, HBase, Cassandra, and others are increasingly used to persist data for analysis and recovery. New persistent memory technologies are adding a new type of non-volatile storage to the mix. Having the core Geode team address every possible use case or store type that may be desired does not scale, nor should it be a gating function on the user community for enabling a new persistence layer. Instead we propose that by developing a properly defined pluggable interface and specification for pluggable persistent stores the Geode persistence layer becomes easily extensible and allow user and the community to add and contribute pluggable use case specific stores. Whether the same applies to over-flow stores is an open question for the community, as the requirements here are different, so we leave that as an open question.

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