Amazon Web Services 文档中描述的 Amazon Web Services 服务或功能可能因区域而异。要查看适用于中国区域的差异，请参阅
中国的 Amazon Web Services 服务入门
(PDF)。
本文属于机器翻译版本。若本译文内容与英语原文存在差异，则一律以英文原文为准。
只读访问 Amazon EMR 的 IAM 托管策略（v2 托管默认策略）。
要向 Amazon EMR 授予只读权限，请附上 A mazon EMRRead OnlyAccessPolicy _v 2 托管策略。此默认托管式策略将替换 AmazonElasticMapReduceReadOnlyAccess 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。
- JSON
-
-
{
"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": [
"*"
]
}
]
}