Handle Lambda service exceptions - AWS Step Functions

Handle Lambda service exceptions

AWS Lambda can occasionally experience transient service errors. In this case, invoking Lambda results in a 500 error, such as ClientExecutionTimeoutException, ServiceException, AWSLambdaException, or SdkClientException. As a best practice, proactively handle these exceptions in your state machine to Retry invoking your Lambda function, or to Catch the error.

Lambda errors are reported as Lambda.ErrorName. To retry a Lambda service exception error, you could use the following Retry code.

"Retry": [ {
   "ErrorEquals": [ "Lambda.ClientExecutionTimeoutException", "Lambda.ServiceException", "Lambda.AWSLambdaException", "Lambda.SdkClientException"],
   "IntervalSeconds": 2,
   "MaxAttempts": 6,
   "BackoffRate": 2
} ]
Note

Unhandled errors in Lambda are reported as Lambda.Unknown in the error output. These include out-of-memory errors and function timeouts. You can match on Lambda.Unknown, States.ALL, or States.TaskFailed to handle these errors. When Lambda hits the maximum number of invocations, the error is Lambda.TooManyRequestsException. For more information about Lambda function errors, see Error handling and automatic retries in the AWS Lambda Developer Guide.

For more information, see the following: