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# 只读访问 Amazon EMR 的 IAM 托管策略（v2 托管默认策略）。
<a name="emr-managed-policy-readonly-v2"></a>

要向 Amazon EMR 授予只读权限，请附上 A **mazon EMRRead OnlyAccessPolicy \$1v** 2 托管策略。此默认托管式策略将替换 [`AmazonElasticMapReduceReadOnlyAccess`](emr-managed-policy-readonly.md) 托管式策略。下面的代码段显示了此策略声明的内容。与 `AmazonElasticMapReduceReadOnlyAccess` 策略相比，`AmazonEMRReadOnlyAccessPolicy_v2` 策略不使用 `elasticmapreduce` 元素的通配符。相反，默认的 v2 策略限定了允许的 `elasticmapreduce` 操作范围。

**注意**  
您也可以使用该 AWS 管理控制台 [https://console.aws.amazon.com/iam/home#policies/arn:aws:iam::aws:policy/AmazonEMRReadOnlyAccessPolicy_v2](https://console.aws.amazon.com/iam/home#policies/arn:aws:iam::aws:policy/AmazonEMRReadOnlyAccessPolicy_v2)链接查看政策。

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#### [ JSON ]

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```
{
  "Version":"2012-10-17",		 	 	 
  "Statement": [
    {
      "Sid": "ElasticMapReduceActions",
      "Effect": "Allow",
      "Action": [
        "elasticmapreduce:DescribeCluster",
        "elasticmapreduce:DescribeEditor",
        "elasticmapreduce:DescribeJobFlows",
        "elasticmapreduce:DescribeSecurityConfiguration",
        "elasticmapreduce:DescribeStep",
        "elasticmapreduce:DescribeReleaseLabel",
        "elasticmapreduce:GetBlockPublicAccessConfiguration",
        "elasticmapreduce:GetManagedScalingPolicy",
        "elasticmapreduce:GetAutoTerminationPolicy",
        "elasticmapreduce:ListBootstrapActions",
        "elasticmapreduce:ListClusters",
        "elasticmapreduce:ListEditors",
        "elasticmapreduce:ListInstanceFleets",
        "elasticmapreduce:ListInstanceGroups",
        "elasticmapreduce:ListInstances",
        "elasticmapreduce:ListSecurityConfigurations",
        "elasticmapreduce:ListSteps",
        "elasticmapreduce:ListSupportedInstanceTypes",
        "elasticmapreduce:ViewEventsFromAllClustersInConsole"
      ],
      "Resource": [
        "*"
      ]
    },
    {
      "Sid": "ViewMetricsInEMRConsole",
      "Effect": "Allow",
      "Action": [
        "cloudwatch:GetMetricStatistics"
      ],
      "Resource": [
        "*"
      ]
    }
  ]
}
```

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