# LambdaExecutionParameters
<a name="API_LambdaExecutionParameters"></a>

Contains parameters for a Lambda function that runs on AWS IoT Greengrass.

## Contents
<a name="API_LambdaExecutionParameters_Contents"></a>

 ** environmentVariables **   <a name="greengrassv2-Type-LambdaExecutionParameters-environmentVariables"></a>
The map of environment variables that are available to the Lambda function when it runs.  
Type: String to string map  
Key Length Constraints: Minimum length of 1.  
Required: No

 ** eventSources **   <a name="greengrassv2-Type-LambdaExecutionParameters-eventSources"></a>
The list of event sources to which to subscribe to receive work messages. The Lambda function runs when it receives a message from an event source. You can subscribe this function to local publish/subscribe messages and AWS IoT Core MQTT messages.  
Type: Array of [LambdaEventSource](API_LambdaEventSource.md) objects  
Required: No

 ** execArgs **   <a name="greengrassv2-Type-LambdaExecutionParameters-execArgs"></a>
The list of arguments to pass to the Lambda function when it runs.  
Type: Array of strings  
Required: No

 ** inputPayloadEncodingType **   <a name="greengrassv2-Type-LambdaExecutionParameters-inputPayloadEncodingType"></a>
The encoding type that the Lambda function supports.  
Default: `json`   
Type: String  
Valid Values: `json | binary`   
Required: No

 ** linuxProcessParams **   <a name="greengrassv2-Type-LambdaExecutionParameters-linuxProcessParams"></a>
The parameters for the Linux process that contains the Lambda function.  
Type: [LambdaLinuxProcessParams](API_LambdaLinuxProcessParams.md) object  
Required: No

 ** maxIdleTimeInSeconds **   <a name="greengrassv2-Type-LambdaExecutionParameters-maxIdleTimeInSeconds"></a>
The maximum amount of time in seconds that a non-pinned Lambda function can idle before the AWS IoT Greengrass Core software stops its process.  
Type: Integer  
Required: No

 ** maxInstancesCount **   <a name="greengrassv2-Type-LambdaExecutionParameters-maxInstancesCount"></a>
The maximum number of instances that a non-pinned Lambda function can run at the same time.  
Type: Integer  
Required: No

 ** maxQueueSize **   <a name="greengrassv2-Type-LambdaExecutionParameters-maxQueueSize"></a>
The maximum size of the message queue for the Lambda function component. The AWS IoT Greengrass core stores messages in a FIFO (first-in-first-out) queue until it can run the Lambda function to consume each message.  
Type: Integer  
Required: No

 ** pinned **   <a name="greengrassv2-Type-LambdaExecutionParameters-pinned"></a>
Whether or not the Lambda function is pinned, or long-lived.  
+ A pinned Lambda function starts when AWS IoT Greengrass starts and keeps running in its own container.
+ A non-pinned Lambda function starts only when it receives a work item and exists after it idles for `maxIdleTimeInSeconds`. If the function has multiple work items, the AWS IoT Greengrass Core software creates multiple instances of the function.
Default: `true`   
Type: Boolean  
Required: No

 ** statusTimeoutInSeconds **   <a name="greengrassv2-Type-LambdaExecutionParameters-statusTimeoutInSeconds"></a>
The interval in seconds at which a pinned (also known as long-lived) Lambda function component sends status updates to the Lambda manager component.  
Type: Integer  
Required: No

 ** timeoutInSeconds **   <a name="greengrassv2-Type-LambdaExecutionParameters-timeoutInSeconds"></a>
The maximum amount of time in seconds that the Lambda function can process a work item.  
Type: Integer  
Required: No

## See Also
<a name="API_LambdaExecutionParameters_SeeAlso"></a>

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/greengrassv2-2020-11-30/LambdaExecutionParameters) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/greengrassv2-2020-11-30/LambdaExecutionParameters) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/greengrassv2-2020-11-30/LambdaExecutionParameters)