[Solved] You have two Lambda functions, both using a shared layer with version 3.... What is the best practice to update the shared code safely? | AWS

AWS - Lambda

You have two Lambda functions, both using a shared layer with version 3. You want to update the shared code without affecting the functions immediately. What is the best practice to update the shared code safely?

ADelete version 3 and create a new layer with the same version number

BOverwrite version 3 of the layer with new code so both functions get updates automatically

CPublish a new layer version 4 with updated code, then update each function to use version 4 when ready

DUpdate the functions' code directly instead of using layers

Step-by-Step Solution

Solution:

Step 1: Understand layer version immutability
Lambda layer versions are immutable; you cannot overwrite an existing version.
Step 2: Apply best practice for safe updates
Publish a new version with updated code and update functions individually to control rollout.
Final Answer:
Publish a new layer version 4 with updated code, then update each function to use version 4 when ready -> Option C
Quick Check:
New layer version + update functions individually = safe update [OK]

Quick Trick: Publish new layer version; update functions selectively [OK]

Common Mistakes:

MISTAKES

Trying to overwrite existing layer version
Deleting and recreating layers with same version
Updating function code instead of using layers

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What is the best practice to update the shared code safely?

Step 1: Understand layer version immutability

Step 2: Apply best practice for safe updates

Final Answer:

Quick Check:

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