[Solved] You updated your Lambda layer code and published a new version.... What is the most likely cause? | AWS

AWS - Lambda

You updated your Lambda layer code and published a new version. After updating your function configuration to use the new layer version, the function still uses old code. What is the most likely cause?

AThe function needs a restart to pick up the new layer version

BThe function configuration was not updated to the new layer version ARN

CThe new layer version was not published correctly

DLambda layers automatically update all functions, so this is impossible

Step-by-Step Solution

Solution:

Step 1: Understand layer versioning
Each layer version has a unique ARN. Functions must explicitly reference the new version ARN to use updated code.
Step 2: Identify common mistake
If the function still uses old code, it likely still references the old layer version ARN.
Final Answer:
The function configuration was not updated to the new layer version ARN -> Option B
Quick Check:
Update function config with new layer ARN to use new code [OK]

Quick Trick: Update function config with new layer ARN after publishing [OK]

Common Mistakes:

Assuming layers auto-update all functions
Not publishing new layer version properly
Thinking function restart is needed

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What is the most likely cause?

Step 1: Understand layer versioning

Step 2: Identify common mistake

Final Answer:

Quick Check:

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