AWS CLoudWatch Log Trigger for Lambda

Question

I have a problem in AWS regarding CloudWatch Log Triggers.

I have two Lambda functions. One (business-lambda) gets triggered when I upload a file to a S3 bucket. The other Lambda function (log-lambda) is triggered whenever business-lambda encounters an invalid file which results in creating an ERROR-log entry. I implemented this with a CloudWatch Log Trigger with filter "?ERROR" and having the log-lambda being subscribed to the log-group of the business-lambda.

Everything works fine as long as I upload one file at a time or at a maximum of ~3 files at a time.

But when I upload eg 10 invalid files at a time the log-lambda doesn't get triggered for all of the files. Instead it only gets triggered for 4-5 of them.

Is there some kind of "Cloudwatch-log-trigger/second" limit?

Answer 1

I found a solution - luk2302 made the correct suggestion in their comment.

In the log-lambda code I only process the first entry from an incoming log-event. But the log-lambda gets triggered once for multiple error-log entries from the business-lambda. I did not take this into account in the log-lambda code.

Thanks to everybody for their time!