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I have a simple personal project I work on from time to time to learn AWS.

Recently I received an alert emailk from aws stating that I'm reaching the free tier quota for one or more services with the following table:

Product AWS Free Tier Usage as of 06/27/2024 Usage Limit AWS Free Tier Usage Limit
AWSQueueService 863587 Requests 1000000 Requests 1000000.0 Requests are always free per month as part of AWS Free Usage Tier (Global-Requests)

The project is mostly serverless architecture developed with the CDK, it has not and never will reach a production stage, no one will ever see nor use it, barely I use it a part from some testing calls.

The project have 4 SQS queuese, each of which trigger a single Lambda function, so checking the monitoring section of each queue I see all the charts are 0 except for Number of Empty Receives:
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I'm still learning on AWS services integrations, so what comes to my mind is that Lambda is continuously polling SQS, thus making requests, while I tought that where SQS the one calling Lambda when new messages where ready, is that correct?

If it is so, how can I reduce the calls from Lambda to SQS? I'm not interested in performance, I just want to not exceed the monthly free tier quota.

Update #1

As @ceejayoz suggested, I need to lower the polling rate from the Lambda service, but don't really know how. In my CDK project I did not configure the triggers, so the deafult configuration is in place for every function, here is one:
enter image description here

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  • Six receives per minute times four queues is going to be 34,560/day; I presume this has been running ~24 days? Can you reduce your SQS polling frequency?
    – ceejayoz
    Commented Jun 28 at 13:46
  • That's what I'm talking about: Is it possible? How? I'm still learning so don't really know where to look for this.
    – fudo
    Commented Jun 28 at 14:04
  • It's certainly possible, but we'd need to know much more about your setup.
    – ceejayoz
    Commented Jun 28 at 14:06
  • i did not configured the triggers from the cdk project, so there is the default configuration for each function. Updated the question.
    – fudo
    Commented Jun 28 at 14:14
  • I think stackoverflow.com/questions/52904643/… might be useful; you may be best suited by SNS triggering the Lambda instead of polling a mostly empty queue.
    – ceejayoz
    Commented Jun 28 at 14:19

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