PayPal open-sourced JunoDB, a distributed key-value store handling 350 billion daily requests with 99.9999% availability. Built in Go for multi-core support and CPU-intensive operations like encryption, JunoDB uses a proxy-based architecture with RocksDB for storage. Unlike Redis's single-threaded, memory-bound design, JunoDB is optimized for CPU-bound workloads. Common use cases include caching with flexible TTLs, implementing idempotency for payment processing, tracking counters for rate limiting, and bridging replication latency between data centers in active-active database configurations.
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