Abstract
Even within one popular sub-category of NoSQL solutions -- key-value (KV) storage systems -- no one existing system meets the needs of all applications. We question this poor state of affairs. In this paper, we make the case for a flexible key-value storage system (Flex-KV) that can support both DRAM and disk-based storage, can act as an unreliable cache or a durable store, and operate consistently or inconsistently. The value of such a system goes beyond ease-of-use: While exploring these dimensions of durability, consistency, and availability, we find new choices for system designs, such as a cache-consistent memcached, that offer some applications a better balance of performance and cost than was previously available.
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