# AwsEcsServicePlacementConstraintsDetails
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A placement constraint for the tasks in the service.

## Contents
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 ** Expression **   <a name="securityhub-Type-AwsEcsServicePlacementConstraintsDetails-Expression"></a>
A cluster query language expression to apply to the constraint. You cannot specify an expression if the constraint type is `distinctInstance`.  
Type: String  
Pattern: `.*\S.*`   
Required: No

 ** Type **   <a name="securityhub-Type-AwsEcsServicePlacementConstraintsDetails-Type"></a>
The type of constraint. Use `distinctInstance` to run each task in a particular group on a different container instance. Use `memberOf` to restrict the selection to a group of valid candidates.  
Valid values: `distinctInstance` \$1 `memberOf`   
Type: String  
Pattern: `.*\S.*`   
Required: No

## See Also
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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/securityhub-2018-10-26/AwsEcsServicePlacementConstraintsDetails) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/securityhub-2018-10-26/AwsEcsServicePlacementConstraintsDetails) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/securityhub-2018-10-26/AwsEcsServicePlacementConstraintsDetails)