AWS › AWS Step Functions
How does Step Functions handle error handling and automatic retries for failed steps within a workflow?
IntermediateAnswer
Step Functions supports defining retry policies directly on individual states, specifying which types of errors should trigger an automatic retry, how many attempts to make, and how long to wait between attempts using exponential backoff, and it also supports catch blocks that let you define a fallback path to execute if a state ultimately fails even after exhausting its retries, allowing workflows to gracefully handle transient failures without needing custom error handling code scattered throughout individual Lambda functions.
{
"Retry": [{"ErrorEquals": ["States.TaskFailed"], "IntervalSeconds": 2, "MaxAttempts": 3, "BackoffRate": 2.0}],
"Catch": [{"ErrorEquals": ["States.ALL"], "Next": "HandleFailure"}]
}Real-world example A data processing workflow automatically retries a Lambda function up to three times with exponential backoff if it encounters a transient database connection error, and only routes to a dedicated failure handling step if all retry attempts are ultimately exhausted.