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Hello,
It's typically the JDBC driver that should be cluster-aware and that's smart enough to cache, failover and retry. It's done the same way on different DB engines, special drivers are provided by DB vendors that achieve all or some of these functionalities.
AWS provides its own JDBC Postgres driver that's cluster-aware but only when used with Aurora (not regular RDS Postgres database): https://github.com/awslabs/aws-postgresql-jdbc
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