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You're in a situation many face with Amazon Aurora, where understanding how endpoints distribute connections isn't always straightforward. Let me explain clearly:

What your manager asked:

"Endpoints will distribute connections passively to the instances" — this means:

• Aurora endpoints (like Cluster Endpoint, Reader Endpoint) don’t actively balance traffic like a true load balancer would.
• Instead, they passively hand out instance information (via DNS) and it's up to the client (JDBC, psql, app, etc.) to decide which IP/instance to connect to.
• For example, Reader Endpoint returns one of the available reader IPs randomly (not round-robin or weighted).

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Why round-robin doesn't work as expected:

• AWS uses DNS-based routing.
• DNS returns one reader instance per query, and often that IP is cached by the client or OS.
• That leads to uneven distribution — one reader gets most of the load.

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Options to improve connection distribution:

1. Use Heimdall Proxy (as AWS suggested):

   • It sits between your app and Aurora.
   • It intelligently splits reads and writes, and can enforce round-robin, least connections, etc.
   • It’s officially supported by AWS.

2. Write custom client-side logic:

   • Your app could manually distribute connections across different reader endpoints (if you list all the IPs with a script).
   • Not always practical or reliable.

3. Using Route 53?

   • You asked AWS about Route 53 — they may suggest:
     • Weighted Routing Policy: Assign equal weight to each reader IP.
     • Latency Routing Policy: Pick closest instance.
   • Caveat: Aurora Reader Endpoint is not integrated natively with Route 53, so AWS may propose using Route 53 with custom records.

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What to do next:

1. Wait for AWS’s suggestion on Route 53 — maybe they will give you a creative setup.
2. Test Heimdall Proxy in a lower environment.
3. If performance is critical and you want full control, consider custom load balancing with an application-aware proxy like:
   • Pgpool-II
   • HAProxy with PostgreSQL support

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Would you like help drafting a response to AWS or your manager to clarify these points?