Finding lambda's current AZ

[Lemour-sudo]

I am accessing my cache from a lambda that is in a vpc.
I am trying to access my cache using the AZ_AFFINITY_REPLICAS_AND_PRIMARY setting in my lambda and getting the following error:
"clientAZ must be set when read_from is set to AZ_AFFINITY_REPLICAS_AND_PRIMARY: glide.api.models.exceptions.ConfigurationError"

I do have a list of AZs for my vpc in cdk but not sure how to know which one my lambda is active in when running.

[avifenesh]

@leandrodamascena @dreamorosi before diving into it, any insight of how to on this matter?

@Lemour-sudo in case you'll find it helpful, for other reasons, @leandrodamascena @dreamorosi owning https://github.com/aws-powertools which include great lambda power tools libs to use with your lambdas.

[leandrodamascena]

Hi @avifenesh, thanks for pinging me. It's actually hard to get this parameter to work in Lambda because there's no way to know in which AZ a particular Lambda is running. The only way to force this is to deploy Lambda in only one AZ, but this is not recommended as you won't benefit from multi-AZ fault tolerance. You also can't query instance metadata in Lambda because this is not available in firecracker container.

Currently, customers using Lambda may not be able to take advantage of this functionality.

Pls let me know if I can help with anything else.

[dreamorosi]

To complement Leandro's answer, take a look at these docs (see section at the bottom related to Lambda): https://docs.aws.amazon.com/whitepapers/latest/advanced-multi-az-resilience-patterns/appendix-a-getting-the-availability-zone-id.html