# DrainSessionInstance
<a name="API_DrainSessionInstance"></a>

Drains the instance hosting the specified streaming session. The instance stops accepting new sessions while existing sessions continue uninterrupted. Once all sessions end, the instance is reclaimed and replaced. This only applies to multi-session fleets.

## Request Syntax
<a name="API_DrainSessionInstance_RequestSyntax"></a>

```
{
   "SessionId": "string"
}
```

## Request Parameters
<a name="API_DrainSessionInstance_RequestParameters"></a>

For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

The request accepts the following data in JSON format.

 ** [SessionId](#API_DrainSessionInstance_RequestSyntax) **   <a name="WorkSpacesApplications-DrainSessionInstance-request-SessionId"></a>
The identifier of the streaming session.  
Type: String  
Length Constraints: Minimum length of 1.  
Required: Yes

## Response Elements
<a name="API_DrainSessionInstance_ResponseElements"></a>

If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors
<a name="API_DrainSessionInstance_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** ConcurrentModificationException **   
An API error occurred. Wait a few minutes and try again.    
 ** Message **   
The error message in the exception.
HTTP Status Code: 400

 ** OperationNotPermittedException **   
The attempted operation is not permitted.    
 ** Message **   
The error message in the exception.
HTTP Status Code: 400

 ** ResourceNotFoundException **   
The specified resource was not found.    
 ** Message **   
The error message in the exception.
HTTP Status Code: 400

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

For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/appstream-2016-12-01/DrainSessionInstance) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/appstream-2016-12-01/DrainSessionInstance)