# InvalidationBatch
<a name="API_InvalidationBatch"></a>

An invalidation batch.

## Contents
<a name="API_InvalidationBatch_Contents"></a>

 ** CallerReference **   <a name="cloudfront-Type-InvalidationBatch-CallerReference"></a>
A value that you specify to uniquely identify an invalidation request. CloudFront uses the value to prevent you from accidentally resubmitting an identical request. Whenever you create a new invalidation request, you must specify a new value for `CallerReference` and change other values in the request as applicable. One way to ensure that the value of `CallerReference` is unique is to use a `timestamp`, for example, `20120301090000`.  
If you make a second invalidation request with the same value for `CallerReference`, and if the rest of the request is the same, CloudFront doesn't create a new invalidation request. Instead, CloudFront returns information about the invalidation request that you previously created with the same `CallerReference`.  
If `CallerReference` is a value you already sent in a previous invalidation batch request but the content of any `Path` is different from the original request, CloudFront returns an `InvalidationBatchAlreadyExists` error.  
Type: String  
Required: Yes

 ** Paths **   <a name="cloudfront-Type-InvalidationBatch-Paths"></a>
A complex type that contains information about the objects that you want to invalidate. For more information, see [Specifying the Objects to Invalidate](https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/Invalidation.html#invalidation-specifying-objects) in the *Amazon CloudFront Developer Guide*.  
Type: [Paths](API_Paths.md) object  
Required: Yes

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

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/cloudfront-2020-05-31/InvalidationBatch) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/cloudfront-2020-05-31/InvalidationBatch) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/cloudfront-2020-05-31/InvalidationBatch)