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# AWS::Batch::JobDefinition NodeProperties
<a name="aws-properties-batch-jobdefinition-nodeproperties"></a>

An object that represents the node properties of a multi-node parallel job.

**Note**  
Node properties can't be specified for Amazon EKS based job definitions.

## Syntax
<a name="aws-properties-batch-jobdefinition-nodeproperties-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-batch-jobdefinition-nodeproperties-syntax.json"></a>

```
{
  "[MainNode](#cfn-batch-jobdefinition-nodeproperties-mainnode)" : {{Integer}},
  "[NodeRangeProperties](#cfn-batch-jobdefinition-nodeproperties-noderangeproperties)" : {{[ NodeRangeProperty, ... ]}},
  "[NumNodes](#cfn-batch-jobdefinition-nodeproperties-numnodes)" : {{Integer}}
}
```

### YAML
<a name="aws-properties-batch-jobdefinition-nodeproperties-syntax.yaml"></a>

```
  [MainNode](#cfn-batch-jobdefinition-nodeproperties-mainnode): {{Integer}}
  [NodeRangeProperties](#cfn-batch-jobdefinition-nodeproperties-noderangeproperties): {{
    - NodeRangeProperty}}
  [NumNodes](#cfn-batch-jobdefinition-nodeproperties-numnodes): {{Integer}}
```

## Properties
<a name="aws-properties-batch-jobdefinition-nodeproperties-properties"></a>

`MainNode`  <a name="cfn-batch-jobdefinition-nodeproperties-mainnode"></a>
Specifies the node index for the main node of a multi-node parallel job. This node index value must be fewer than the number of nodes.  
*Required*: Yes  
*Type*: Integer  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`NodeRangeProperties`  <a name="cfn-batch-jobdefinition-nodeproperties-noderangeproperties"></a>
A list of node ranges and their properties that are associated with a multi-node parallel job.  
*Required*: Yes  
*Type*: Array of [NodeRangeProperty](aws-properties-batch-jobdefinition-noderangeproperty.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`NumNodes`  <a name="cfn-batch-jobdefinition-nodeproperties-numnodes"></a>
The number of nodes that are associated with a multi-node parallel job.  
*Required*: Yes  
*Type*: Integer  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

## See also
<a name="aws-properties-batch-jobdefinition-nodeproperties--seealso"></a>
+ [Multi-node Parallel Jobs](https://docs.aws.amazon.com/batch/latest/userguide/multi-node-parallel-jobs.html) in the * AWS Batch User Guide *.