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qkhanhpro
qkhanhpro

Reputation: 5240

AWS Lambda: async C# handler

The AWS document states that

Using Async in C# Functions with AWS Lambda

If you know your Lambda function will require a long-running process, such as uploading large files to Amazon S3 or reading a large stream of records from DynamoDB, you can take advantage of the async/await pattern. By creating a handler with this signature, Lambda will execute the function synchronously and wait a maximum of 5 minutes for execution to complete before returning or timing out.

I feel very confused Lambda will

execute the function synchronously and wait a maximum of 5 minutes

When Lambda support up to 15 minutes of processing time. Does that mean if I put async on the handler, I can only process one event in 5 minutes?

Upvotes: 7

Views: 3592

Answers (2)

qkhanhpro
qkhanhpro

Reputation: 5240

The final answer of AWS support at the time:

  • The document was not up to date. It should run at maximum 15 minute timeout ( depend on the Lambda function configuration )
  • The async modifier does not change how AWS behave, they will just await it.
  • The behaviour diference is only on the .NET side

Upvotes: 7

iikkoo
iikkoo

Reputation: 2856

AWS recently changed the timeout for Lamdba. The execution timeout is changed from 5 minutes to 15 minutes.

https://aws.amazon.com/about-aws/whats-new/2018/10/aws-lambda-supports-functions-that-can-run-up-to-15-minutes/

Upvotes: 0

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