I build my APIs using AWS API Gateway, Lambda, and RDS. I’m calling APIs inside a Lambda, but sometimes I’m getting a task timed-out error. Why it’s happening? I checked all the things below; what else can I do? 1. The Lambda has enough memory to handle the API calls. 2. There is no issue with the concurrent request. 3. The API returns a response successfully. 4. Everything regarding RDS is OK. DB load, CPU credit, etc. 5. As all my Lambdas are inside a VPC, there is no issue with the connectivity.

A Lambda shows a task-timed-out error while calling an API endpoint, but the API endpoint log shows that the response was returned within a millisecond.

I build my APIs using AWS API Gateway, Lambda, and RDS. I’m calling APIs inside a Lambda, but sometimes I’m getting a task timed-out error. Why it’s happening? I checked all the things below; what else can I do?

The Lambda has enough memory to handle the API calls.
There is no issue with the concurrent request.
The API returns a response successfully.
Everything regarding RDS is OK. DB load, CPU credit, etc.
As all my Lambdas are inside a VPC, there is no issue with the connectivity.

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서버리스 AWS Lambda 아마존 API 게이트웨이 데이터베이스

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Awolad Hossain

질문됨 7달 전239회 조회

1개 답변

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이 답변이 도움이 되었나요?커뮤니티가 여러분의 지식을 활용할 수 있도록 정답을 찬성하세요.

Difficult to say without more information. What I would suggest is to had log messages in your function to check what is taking long time.

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Uri

답변함 7달 전

Awolad Hossain
7달 전
Thanks for your comment. I have logs. Below are the steps of the execution.

Inside the Lambda, the API called

There is no task after the API call

After 29 seconds, it shows the "Task timed out ...."

The API logs show the response is returned successfully within a few milliseconds

But the Lambda did not receive the response

It's not happening always. Once or twice a day. I assumed that it could be a request throttle due to concurrent requests or the RDS resource limit being exceeded, but nothing happened.
Uri 전문가
7달 전
The network is not a 100% reliable medium. It could be that the API responded, but the response never got to the function. What I would recommend is to put a timeout on the API call and retry in case you do not get the answer in time.

A Lambda shows a task-timed-out error while calling an API endpoint, but the API endpoint log shows that the response was returned within a millisecond.

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