Do event notifications get lost during lambda function update?

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Do event notifications get lost during lambda function update?



I have a Lambda function that listens to S3 create requests. If I update the function, is there a brief amount of time where I am losing S3 notifications or do events continue to be served by the old version of the function?



If they are being lost, is there a recommended way to deal with the transition so events don't get lost?





I doubt there's any specific statement on the behavior here, but I would not expect you to have to do anything. There is always some version of the code available for Lambda to load, whether it's the previous version or the new version.
– jarmod
Aug 8 at 1:44




1 Answer
1



The old version continues to run until the new version is up. No traffic/requests will be lost. Multiple lambda are stored allowing you to rollback.



When a function update request is made (even without a specific function version) an alias is created with an ARN and deployed then $LATEST is swapped to point to the new version.


$LATEST



A point of interest: You can actually slowly migrate your new lambda over with Traffic Shifting Allowing you to monitor your new function with a subset of production traffic until you gain confidence to roll it out all the way.






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