Error": "Lambda.TooManyRequestsException"

Question

Hi Team, i am facing below error please help me for solution.   "Error": "Lambda.TooManyRequestsException",       "Cause": "Rate Exceeded. (Service: AWSLambda; Status Code: 429; Error Code: TooManyRequestsException; Request ID: ce268cb4-32b9-46ce-882e-0321506ef544; Proxy: null)" .

i tried with  MaxConcurrency: 200 and timeout in aws step function yml file

stepFunctions:
  stateMachines:
    preProcessProduct:
      name: processProductARN-${sls:stage}
      definition:
        Comment: "Product updation/creation through the Amazon States Language using an AWS Lambda Function"
        StartAt: preProcessProduct
        States:
          preProcessProduct:
            Type: Task
            Resource: "arn:aws:lambda:${self:provider.region}:XXX:function:${self:service}-dev-preProcessProduct"
            ResultPath: $
            Catch:
              - ErrorEquals: [States.ALL] 
                ResultPath: $.preProcessProductError
                Next: userError
            Next: processProductMap
          processProductMap:
            Type: Map
            InputPath: $
            # ItemsPath: $
            MaxConcurrency: 200
            Iterator: 
              StartAt: processProduct
              States: 
                 processProduct:
                   Type: Task
                   Resource: "arn:aws:lambda:${self:provider.region}:XXX:function:${self:service}-dev-processProduct"
                   ResultPath: $.outPut
                   TimeoutSeconds: 60
                   Retry:
                     - ErrorEquals: [ "TooManyRequestsException" ]
                       IntervalSeconds: 60
                       MaxAttempts: 2                         
                   Catch:
                     - ErrorEquals: [States.ALL]
                       ResultPath: $.processProductError
                       Next: processProductError
                   End: true

Answer

Hello,

The error relates to the underlying Lambda function, so you have either reached the default account limit of 1000 parallel lambda executions. Or
the lambda you're trying to execute has a configured concurrency that you max out.

https://docs.aws.amazon.com/lambda/latest/dg/configuration-concurrency.html

The MaxConcurrency on the StepFunction relates to the specific Step in that execution. So if you have a `Type: Map` with `MaxConcurrency: 200`, then do 6 executions on that StepFunction, and you will execute 1200 lambdas in parallel.

The Lambda limits is shared by the whole account and region, so any other execution on any lambda might contribute the problem as well.

I storing recommend that you [FunctionConcurrency](https://docs.aws.amazon.com/lambda/latest/dg/API_PutFunctionConcurrency.html) on lambdas that will be triggered this much so that they don't affect the rest of your account executions.

Hope this helps!

Regards,

Carl Östrand

Error": "Lambda.TooManyRequestsException"

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