Is it necessary to enable cache with a single replica StoreGateway?

[debuggedme]

In StoreGateway, does Groupcache solve the caching issue between replicas or between shards? My understanding is that it solves the caching issue between replicas. If my replica is set to 1, is enabling the cache here unnecessary?

[dosubot[bot]]

Hey @debuggedme! I'm here to help you with any bugs, questions, or contributions. Let's tackle this together!

Enabling cache in Thanos StoreGateway, even with a single replica, is beneficial. It reduces startup time, improves query performance, and optimizes resource utilization by minimizing the load on object storage and network traffic ^[1][2].

Groupcache in Thanos StoreGateway is designed to enhance data retrieval efficiency by maintaining a distributed cache across multiple peers, which is particularly useful when there are multiple replicas. However, even with a single replica, caching can still provide performance improvements by reducing the need to repeatedly access backend storage for the same data ^[3].

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