Hotspot Caching in Google Zanzibar and SpiceDB
Blog post from AuthZed
In the context of caching, a timestamp represents a unique point in time and is used to evaluate sub-problems and their answers, ensuring consistency across multiple servers. SpiceDB uses consistent hashing to distribute cache entries across Zanzibar servers, allowing for efficient reuse of cache entries and minimizing latency. The system allows users to choose from four levels of consistency: fully_consistent, at_exact_snapshot, minimize_latency, and at_least_as_fresh, each making different tradeoffs between consistency, freshness, and performance. The choice of timestamp is crucial in determining the overall caching strategy, as it affects the staleness of results and the ability to reuse cache entries. By understanding how these concepts work together, SpiceDB can efficiently manage cache entries and provide low-latency responses while maintaining high availability.
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