# Amazon EMR
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 Amazon EMR helps you analyze and process vast amounts of data by distributing the computational work across a cluster of virtual servers running in the Amazon Cloud. The cluster is managed using an open-source framework called Hadoop. Amazon EMR lets you focus on crunching or analyzing your data without having to worry about time-consuming setup, management, and tuning of Hadoop clusters or the compute capacity they rely on.

## Region Availability
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 Amazon EMR is available in the following regions in China:
+ Beijing Region
+ Ningxia Region

## Feature Availability and Implementation Differences
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The Amazon Web Services in China implementation of Amazon EMR is unique in the following ways:
+ Automatic Amazon Linux updates, as discussed in the [Amazon EMR Management Guide](https://docs.amazonaws.cn/emr/latest/ManagementGuide/emr-default-ami.html), are not enabled in the Beijing and Ningxia Regions.
+  Amazon EMR does not support AMI version 2.4.11 and earlier in the Beijing and Ningxia regions. The China (Ningxia) region only supports Amazon EMR version 4.9.1 and later.
+ YARN **Application history** is not available on the cluster details page.
+ The old Amazon EMR management console is the default console for the Beijing and Ningxia Regions.
+ The following table indicates which instance are available to be used with Amazon EMR in the Beijing and Ningxia regions. **Yes** appears for regions where the instance type is available.    
[See the AWS documentation website for more details](http://docs.amazonaws.cn/en_us/aws/latest/userguide/emr.html)

## Guides and References
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Amazon Web Services in China user guides are available in HTML and PDF, in both Chinese and English. API references are available in HTML and PDF. Some API references may be available only in English. Currently, not all API references are available in the Beijing and Ningxia Regions. Links to some API references will take you to the global Amazon Web Services site. Note that some features and functionality described in the guides and references may not be available in the current Amazon Web Services in China release.
+ All Amazon EMR versions
  +  [Amazon EMR API Reference](http://docs.aws.amazon.com/ElasticMapReduce/latest/API/) 
+  Amazon EMR versions 4.0 and later
  +  [Amazon EMR Management Guide](https://docs.amazonaws.cn/emr/latest/ManagementGuide/) 
  +  [Amazon EMR Release Guide](https://docs.amazonaws.cn/emr/latest/ReleaseGuide/) 
+  Amazon EMR versions earlier than 4.0
  +  [Amazon EMR Developer Guide](https://docs.amazonaws.cn/emr/latest/DeveloperGuide/) (applies only to Amazon EMR versions earlier than 4.0)

## General Information About Amazon Web Services in China
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The following information applies to all Amazon Web Services that are available in the China Regions.

 **Amazon Web Services Accounts in the China Regions** 

To use services in the Beijing and Ningxia Regions, you need an account and credentials specific to each of those Regions.
+ Accounts and credentials for other Amazon Regions will not work for services operating in the Beijing and Ningxia Regions.
+ Accounts and credentials for the Beijing and Ningxia Regions will not work for other Amazon Regions.
+ For more information, see [Signup, Accounts, and Credentials](accounts-and-credentials.md).

 **Domain for Amazon Web Services in China** 

The domain for Amazon Web Services in China is **www.amazonaws.cn**.

 **Endpoints & Amazon Resource Names (ARNs)** 

For information about endpoints and ARNs in Amazon Web Services in China, see [Endpoints and ARNs for Amazon Web Services in China](endpoints-arns.md).

 ** Availability Zones for the China Regions** 
+ In the Beijing Region, there are three Availability Zones.
+ In the Ningxia Region, there are three Availability Zones.

 **General Information for Amazon Web Services in China** 

The following applies to all Amazon Web Services that are available in the China Regions. For detailed information about specific Amazon Web Services, see the service-specific topic in this guide.
+ Amazon Identity and Access Management (IAM)
  + You can grant or deny a service access to resources using the `Principal` policy element.
  + Service principal values vary by Region.
+ Free Usage Tier
  + For information about Free Tier offers and availability in the China Regions, see [Amazon Web Services China Regions Free Tier](https://www.amazonaws.cn/en/free).

 **Amazon Web Services Console** 

The console for Amazon Web Services in China is unique to China. The screenshots in the Amazon Web Services guides might differ from what you see on your console. For information about differences in service functionality, see the topics for each service in this guide.

 **Code Examples** 

The Amazon Web Services documentation might include endpoints and ARNs in code examples that are not specific to the Beijing and Ningxia Regions. When using examples, verify you are using the endpoints and ARNs for your Region.