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krzysiexp
Asked: 2021-06-18 03:22:39 +0800 CST

Lambda with VPC long cold start

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I have few lambda functions that are connecting to Mongo Atlas cluster. Connection between Mongo Atlas and my AWS account is done via VPC Peering. Lambda functions are attached to this VPC.

I'm experiencing long cold starts of Lambdas, it's taking around 10 seconds for lambda to respond with VPC, and around 1-2 seconds without VPC. Based on changes that AWS made some time ago (https://aws.amazon.com/blogs/compute/announcing-improved-vpc-networking-for-aws-lambda-functions/) I shouldn't experience long cold starts.

Screenshots of my config:

lambda vpc config

vpc peering config

vpc config

vpc route table

Is something wrong with my setup?

amazon-web-services amazon-vpc vpc-peering amazon-lambda

1 Answers

  1. Best Answer

    We didn't find solution for that. To workaround that we've disabled VPC peering in Atlas.

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