# Lambda manager
<a name="lambda-manager-component"></a>

The Lambda manager component (`aws.greengrass.LambdaManager`) manages work items and interprocess communication for AWS Lambda functions that run on the Greengrass core device.

**Note**  <a name="lambda-component-dependency-note"></a>
When you deploy a Lambda function component to a core device, the deployment also includes this component. For more information, see [Run AWS Lambda functions](run-lambda-functions.md).

**Topics**
+ [Versions](#lambda-manager-component-versions)
+ [Operating system](#lambda-manager-component-os-support)
+ [Type](#lambda-manager-component-type)
+ [Requirements](#lambda-manager-component-requirements)
+ [Dependencies](#lambda-manager-component-dependencies)
+ [Configuration](#lambda-manager-component-configuration)
+ [Local log file](#lambda-manager-component-log-file)
+ [Changelog](#lambda-manager-component-changelog)

## Versions
<a name="lambda-manager-component-versions"></a>

This component has the following versions:
+ 2.3.x
+ 2.2.x
+ 2.1.x
+ 2.0.x

## Operating system
<a name="lambda-manager-component-os-support"></a>

This component can be installed on Linux core devices only.

## Type
<a name="lambda-manager-component-type"></a>

<a name="public-component-type-plugin-para1"></a>This component is a plugin component (`aws.greengrass.plugin`). The [Greengrass nucleus](greengrass-nucleus-component.md) runs this component in the same Java Virtual Machine (JVM) as the nucleus. The nucleus restarts when you change this component's version on the core device.

<a name="public-component-type-plugin-para2"></a>This component uses the same log file as the Greengrass nucleus. For more information, see [Monitor AWS IoT Greengrass logs](monitor-logs.md).

<a name="public-component-type-more-information"></a>For more information, see [Component types](develop-greengrass-components.md#component-types).

## Requirements
<a name="lambda-manager-component-requirements"></a>

This component has the following requirements:
+ <a name="core-device-lambda-function-requirements"></a>Your core device must meet the requirements to run Lambda functions. If you want the core device to run containerized Lambda functions, the device must meet the requirements to do so. For more information, see [Lambda function requirements](setting-up.md#greengrass-v2-lambda-requirements).
+ The Lambda manager component is supported to run in a VPC.

## Dependencies
<a name="lambda-manager-component-dependencies"></a>

When you deploy a component, AWS IoT Greengrass also deploys compatible versions of its dependencies. This means that you must meet the requirements for the component and all of its dependencies to successfully deploy the component. This section lists the dependencies for the [released versions](#lambda-manager-component-changelog) of this component and the semantic version constraints that define the component versions for each dependency. You can also view the dependencies for each version of the component in the [AWS IoT Greengrass console](https://console.aws.amazon.com//greengrass). On the component details page, look for the **Dependencies** list.

------
#### [ 2.3.7 ]

The following table lists the dependencies for version 2.3.7 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) | >=2.0.0 <2.17.0 | Soft | 

------
#### [ 2.3.6 ]

The following table lists the dependencies for version 2.3.6 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.16.0  | Soft | 

------
#### [ 2.3.5 ]

The following table lists the dependencies for version 2.3.5 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.15.0  | Soft | 

------
#### [ 2.3.4 ]

The following table lists the dependencies for version 2.3.4 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.14.0  | Soft | 

------
#### [ 2.3.2 and 2.3.3 ]

The following table lists the dependencies for version 2.3.2 and 2.3.3 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.13.0  | Soft | 

------
#### [ 2.2.10 and 2.3.1 ]

The following table lists the dependencies for version 2.2.10 and 2.3.1 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.12.0  | Soft | 

------
#### [ 2.2.8 and 2.2.9 ]

The following table lists the dependencies for version 2.2.8 and 2.2.9 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.11.0  | Soft | 

------
#### [ 2.2.7 ]

The following table lists the dependencies for version 2.2.7 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.10.0  | Soft | 

------
#### [ 2.2.6 ]

The following table lists the dependencies for version 2.2.6 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.9.0  | Soft | 

------
#### [ 2.2.5 ]

The following table lists the dependencies for version 2.2.5 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.8.0  | Soft | 

------
#### [ 2.2.4 ]

The following table lists the dependencies for version 2.2.4 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.7.0  | Soft | 

------
#### [ 2.2.1 - 2.2.3 ]

The following table lists the dependencies for versions 2.2.1 to 2.2.3 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.6.0  | Soft | 

------
#### [ 2.2.0 ]

The following table lists the dependencies for version 2.2.0 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.5.0 <2.6.0  | Soft | 

------
#### [ 2.1.3 and 2.1.4 ]

The following table lists the dependencies for versions 2.1.3 and 2.1.4 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.5.0  | Soft | 

------
#### [ 2.1.2 ]

The following table lists the dependencies for version 2.1.2 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.4.0  | Soft | 

------
#### [ 2.1.1 ]

The following table lists the dependencies for version 2.1.1 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.3.0  | Soft | 

------
#### [ 2.1.0 ]

The following table lists the dependencies for version 2.1.0 of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.0 <2.2.0  | Soft | 

------
#### [ 2.0.x ]

The following table lists the dependencies for version 2.0.x of this component.


| Dependency | Compatible versions | Dependency type | 
| --- | --- | --- | 
| [Greengrass nucleus](greengrass-nucleus-component.md) |  >=2.0.3 <2.1.0  | Soft | 

------

For more information about component dependencies, see the [component recipe reference](component-recipe-reference.md#recipe-reference-component-dependencies).

## Configuration
<a name="lambda-manager-component-configuration"></a>

This component provides the following configuration parameters that you can customize when you deploy the component.

`logHandlerMode`  
Only for lambda manager versions 2.3.0\$1 
Used to choose the implementation of the Lambda log manager to use. Set the value to `optimized` to use fewer threads to read lambda logs.

`getResultTimeoutInSecond`  
(Optional) The maximum amount of time in seconds that Lambda functions can run before they time out.  
Default: `60`

## Local log file
<a name="lambda-manager-component-log-file"></a>

This component uses the same log file as the [Greengrass nucleus](greengrass-nucleus-component.md) component.

```
/greengrass/v2/logs/greengrass.log
```

**To view this component's logs**
+ Run the following command on the core device to view this component's log file in real time. Replace `/greengrass/v2` with the path to the AWS IoT Greengrass root folder.

  ```
  sudo tail -f /greengrass/v2/logs/greengrass.log
  ```

## Changelog
<a name="lambda-manager-component-changelog"></a>

The following table describes the changes in each version of the component.


|  **Version**  |  **Changes**  | 
| --- | --- | 
|  2.3.8  |  Updates the component version for the Greengrass nucleus version 2.17.0 release.  | 
|  2.3.7  |  Version updated for Greengrass nucleus version 2.16.0 release.  | 
|  2.3.6  | Version updated for Greengrass nucleus version 2.15.0 release. | 
|  2.3.5  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.3.4  | Version updated for Greengrass nucleus version 2.13.0 release. | 
|  2.3.3  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.3.2  | Version updated for Greengrass nucleus version 2.12.0 release. | 
|  2.3.1  |  <a name="changelog-lambda-manager-2.3.1"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.3.0  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.11  |  <a name="changelog-lambda-manager-2.2.11"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.10  | Version updated for Greengrass nucleus version 2.11.0 release. | 
|  2.2.9  |  <a name="changelog-lambda-manager-2.2.9"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.8  | Version updated for Greengrass nucleus version 2.10.0 release. | 
|  2.2.7  | Version updated for Greengrass nucleus version 2.9.0 release. | 
|  2.2.6  | Version updated for Greengrass nucleus version 2.8.0 release. | 
|  2.2.5  |  <a name="changelog-lambda-manager-2.2.5"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.4  |  Version updated for Greengrass nucleus version 2.6.0 release.  | 
|  2.2.3  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.2  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.1  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.2.0  |  <a name="changelog-lambda-manager-2.2.0"></a>[\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.1.4  |  [\[See the AWS documentation website for more details\]](http://docs.aws.amazon.com/greengrass/v2/developerguide/lambda-manager-component.html)  | 
|  2.1.3  |  Version updated for Greengrass nucleus version 2.4.0 release.  | 
|  2.1.2  |  Version updated for Greengrass nucleus version 2.3.0 release.  | 
|  2.1.1  |  Version updated for Greengrass nucleus version 2.2.0 release.  | 
|  2.1.0  |  Version updated for Greengrass nucleus version 2.1.0 release.  | 
|  2.0.3  |  Initial version.  |