# ActivityTaskCancelRequestedEventAttributes
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Provides the details of the `ActivityTaskCancelRequested` event.

## Contents
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 ** activityId **   <a name="SWF-Type-ActivityTaskCancelRequestedEventAttributes-activityId"></a>
The unique ID of the task.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 256.  
Required: Yes

 ** decisionTaskCompletedEventId **   <a name="SWF-Type-ActivityTaskCancelRequestedEventAttributes-decisionTaskCompletedEventId"></a>
The ID of the `DecisionTaskCompleted` event corresponding to the decision task that resulted in the `RequestCancelActivityTask` decision for this cancellation request. This information can be useful for diagnosing problems by tracing back the chain of events leading up to this event.  
Type: Long  
Required: Yes

## 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/swf-2012-01-25/ActivityTaskCancelRequestedEventAttributes) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/swf-2012-01-25/ActivityTaskCancelRequestedEventAttributes) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/swf-2012-01-25/ActivityTaskCancelRequestedEventAttributes)