Cloud Computing
AWS Lambda intermittently cannot reach RDS after scaling
troublesync_editorial
3w ago
Environment
Environment
Node.js Lambda in a VPC connecting to PostgreSQL through RDS Proxy.
What happens
What happens
Connection timeouts occur only during traffic bursts and disappear after several minutes.
What I have tried
What I have tried
Raised Lambda timeout and database max_connections.
I would appreciate advice on how to identify the root cause without risking existing data or configuration.
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AI DIAGNOSTICS
Incident analysis
Most likely causes
Connections are not reused correctly or the proxy pool is exhausted during concurrency spikes. 81%
A recent software, firmware or configuration change is exposing an existing compatibility issue. 33%
Summary
The reported behaviour is consistent with connections are not reused correctly or the proxy pool is exhausted during concurrency spikes. The safest next step is to verify that hypothesis with a reversible test before making permanent configuration changes.
Suggested Fixes
Verify the likely cause
Create the client outside the handler, release connections, inspect proxy borrow latency and cap reserved concurrency to database capacity.
Validate and monitor
Reproduce the issue once after the change, review relevant logs or metrics, and keep a rollback path until the system has remained stable.