reserved_concurrent_executions | Patterned Designs Documentation

Concurrency Values

Value	Behavior
`-1`	No reserved concurrency (default)
`0`	Function is disabled
`1+`	Reserved concurrent executions

Use Cases

Rate limiting: Protect downstream resources
Cost control: Limit execution costs
Throttling: Control function invocation rate
Disable function: Set to 0 for maintenance

Best Practices

Monitor Throttles metric in CloudWatch
Set reserved concurrency for functions with database connections
Leave some unreserved concurrency for other functions
Use provisioned concurrency for latency-sensitive workloads

Full Module Example

module "lambda_function" {
  source  = "registry.patterneddesigns.ca/patterneddesigns/lambda-function/aws"
  version = "0.1.0"

  # reserved_concurrent_executions
  reserved_concurrent_executions = -1

  # Other required inputs
  function_name = my-resource
  runtime = python3.9
  handler = example-value
  source_path = /path/to/resource
}