Ravi Sir's Cards › AWS
Fan-in join
This revision card explains Fan-in join. It starts from the need that starting the next step before all branches finish corrupts state. It describes step Functions Parallel/Map joins known or dynamic branches. The how-to section notes parallel branches , then ResultPath , then next state only after all succeed/handled. An example on the card is lucas Silva waits for tax + fraud branches before charge.
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What this card says
Why do we need it?
Starting the next step before all branches finish corrupts state.
What is it?
Step Functions Parallel/Map joins known or dynamic branches.
Parallel
How to do it
Parallel branches → ResultPath → next state only after all succeed/handled.
Example
Lucas Silva waits for tax + fraud branches before charge.