Ravi Sir's Cards › AWS
Why avoid writing back to the same S3 prefix you listen on?
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
Your write can create another ObjectCreated event and recurse.
Why it matters
Bills and throttling explode until you stop the trigger.
How / example
Read images/; write thumbs/ or another bucket.