AWS Cloudwatch/Lambda - 计划事件触发太频繁

Question

i created an AWS Lambda function , and created a scheduled event rule in Cloudwatch to trigger it every 5 minutes : Schedule Cron expression : 0/5 * * * ? * Schedule Cron expression : 0/5 * * * ? *

The problem is that when looking at the logs, the Lambda seems to be executed every 1~2 minute.

I checked the CRON expression, it seem correct because AWS shows previews of the next triggers. I also tried with a rate expression, but i still have the same issue.

I tooks a look at cloudwatch metrics : - The scheduled event seems fine, it triggered once every 10minutes - The lambda invocation metric show that it is invoked more often

Any help ?

Answer 1

Thanks @JohnRotenstein for the lead,

the issue came from the returned result from the NodeJS promise. If the JS handler doesn't give back any result inside the returned promise, lambda considers the execution as a failure.

In my case i simply had to return a value (even null ) so that the execution completes successfully. Otherwise it looks like lambda will to re-execute the code 1~2 minutes later