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docs: add a para about random selection of read replicas
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/10807 GitOrigin-RevId: 986ccc2114e5dc4b67048091cc8358058b4a60e8
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@ -29,6 +29,11 @@ import ProductBadge from '@site/src/components/ProductBadge';
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Hasura Cloud and Hasura Enterprise can route queries and subscriptions across _read replicas_ while sending all
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mutations and Metadata API calls to the primary.
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This works by selecting a read replica instance at random. Hasura does not
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perform any kind of load balancing across the replicas. The random function used
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has a uniform distribution, and so over time, queries will distribute uniformly
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across all replica instances.
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## Adding read replica URLs
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### Postgres
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