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Read replica support for Postgres and MySQL datastores #1878

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Read replica support for Postgres and MySQL datastores #1878

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Commits on Apr 25, 2024

  1. Add support for read replicas to Postgres and MySQL data stores 

    This is accomplished by adding a datastore proxy that selects a read replica for each SnapshotReader, in a round robin fashion, and ensures that the revision being requested is available on the replica. This extra check does add some latency to the overall operation, but it should provide for the safest approach for using read replicas

Fixes authzed#1321
Fixes authzed#1320
    @josephschorr
    josephschorr committed Apr 25, 2024
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  2. Add caching on read replica CheckRevision calls to reduce the overhea… 

    …d of using read replicas
    @josephschorr
    josephschorr committed Apr 25, 2024
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