Caching in the Apollo Router

The Apollo Router comes with an in-memory cache, used to store Automated Persisted Queries (APQ) and query plans. This is a Least Recently Used (LRU) cache, that can be configured as follows:

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supergraph:
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  apq:
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    experimental_cache:
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      in_memory:
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        limit: 512
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  query_planning:
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    experimental_cache:
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      in_memory:
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        limit: 512

Introspection responses are cached too, but that cache is not configurable for now.

Experimental Redis cache

The Apollo Router has an experimental external storage cache, using Redis Cluster or a single Redis instance (if you provide only one url). It can be tested by building a custom Router binary, with the Cargo feature experimental_cache.

This will activate a configuration option to connect to a Redis Cluster:

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supergraph:
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  apq:
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    experimental_cache:
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      in_memory:
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        limit: 512
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      redis:
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        urls: ["redis://..."]
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  query_planning:
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    experimental_cache:
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      in_memory:
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        limit: 512
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      redis:
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        urls: ["redis://..."]