AWS::Lambda::Function S3FilesConfig - AWS CloudFormation
SyntaxProperties
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AWS::Lambda::Function S3FilesConfig

Setting controls how your function accesses data from an Amazon S3 file system.

Syntax

To declare this entity in your CloudFormation template, use the following syntax:

JSON

{
  "DirectS3Read" : String
}

YAML

  DirectS3Read: String

Properties

DirectS3Read

Specifies if a function reads from the file system for the lowest latency, or through Amazon S3 Files feature "direct Amazon S3 bucket reads" for the highest throughput. Valid values:

  • AUTO (default) – Direct reads are active for functions you configure with 512 MB or more of memory.

  • ENABLED – Enforces all reads are directly from the Amazon S3 bucket, regardless of available memory (less than 512 MB).

  • DISABLED – Routes all reads through the file system, regardless of memory configuration.

To use direct reads, you must grant the execution role the s3:GetObject and s3:GetObjectVersion permissions. If a direct read fails, Lambda automatically falls back to reading through the file system.

Required: No

Type: String

Allowed values: ENABLED | DISABLED | AUTO

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