Lambda 在哪里存储 Kinesis 批处理的重试次数？

Question

I have several Lambdas that are triggred by Kinesis. The Lambdas are configured to handle a Kinesis Event struct - this event struct essentially contains a slice of Kinesis Records (so that one Lambda invocation can process thousands of records from a stream).

I've configured my Lambdas to enable BisectBatchOnFunctionError (documented here and here ) and MaximumRetryAttempts (to limit the number of retries if the Lambda errors out). I would like to keep track of the number of retries for Kinesis batches - since an increase in retries could be the result of either an API error or a malformed Kinesis record.

Since I'm able to specify the MaximumRetryAttempts for a batch, then it stands to reason that the number of retries has to be tracked for each batch too (otherwise AWS wouldn't be able to tell whether the MaximumRetryAttempts had been met/exceeded) - but I'm unable to find where this count is tracked.

I've looked at both the aws-lambda-go repo, and the aws-sdk-go-v2 repo, and I can't find any reference to such a count. I've also looked through AWS docs, and can't find any reference to a retry count there either. Am I missing something here, or is this retry counter just some internal AWS metric?

Answer 1

I would like to keep track of the number of retries for Kinesis batches - since an increase in retries could be the result of either an API error or a malformed Kinesis record.

You can track this just by using the Lambda's Errors metric, which will emit a 1 if a retry happens since retries happen on Lambda errors. If you see a spike in the Errors metric then there is a spike in retries is happening as well.