Ravi Sir's Cards › AWS
Why must async handlers be idempotent?
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
What it is
Retries can deliver the same event more than once.
Why it matters
Re-applying the same work must be safe.
How / example
Key writes by event id; skip if already processed.