Trigger the second Lambda function 2 hours later after the first one successfully has executed successfully

Serverless Framework
1

Hi All,

Currently I have two Lambda functions (A, and B). I am trying to build the workflow that A is doing some changes on some AWS resources and keep it for 2 hours, while 2 hours later, B change the config of those AWS resources back to the initial state. Is there a flexible way to do that? Since the function A is triggered by a Cron function. I am also considering is the step function is the solution to my scenario? Thanks.

Best.

2

Hi KanesYang,

It sounds like Step Functions would be the best way to handle this situation. You can add a wait step for 2 hours and then Step Functions will continue on and invoke Function B. The alternative way you could handle this is for Function A to create a CloudWatch Event for 2 hours later that invokes Function B. Once Function B has completed its tasks it would delete the CloudWatch Event.

First option is a cleaner approach.

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3

use step functions or use dynamodb streams with a 2 hours TTL items

Read more about it here
https://theburningmonk.com/2019/03/dynamodb-ttl-as-an-ad-hoc-scheduling-mechanism/

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