创建EMR群集时出错，EMR服务角色无效

Question

我正在通过cloudformation和lambda函数创建一个emr集群。创建堆栈后，当我运行lambda函数时，它将通过赋予EMR服务角色来启动群集：is invalid error。我的服务角色和工作流程角色代码已随附。我缺少什么权限，或者应该授予该权限，以便我的emr开始执行这些步骤。

EMRClusterServiceRole:
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal:
            Service:
            - ec2.amazonaws.com
          Action:
          - 'sts:AssumeRole'
      ManagedPolicyArns:
            - arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceforEC2Role
      Path: /

  EMRClusterinstanceProfileRole: 
    Type: 'AWS::IAM::Role'
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal: 
            Service: 
            - ec2.amazonaws.com
          Action: 
          - 'sts:AssumeRole'
      ManagedPolicyArns: 
        - arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceforEC2Role
      Path: /

  EMRClusterinstanceProfile:
    Type: AWS::IAM::InstanceProfile
    Properties:
      Path: /
      Roles:
      - !Ref EMRClusterinstanceProfileRole

  EMRJobFlowProfileinstance: 
    Type: AWS::IAM::InstanceProfile
    Properties:
      Path: /
      Roles:
      - !Ref EMRJobFlowRole


  EMRJobFlowRole:       
    Type: AWS::IAM::Role
    Properties:
      AssumeRolePolicyDocument:
        Version: 2012-10-17
        Statement:
        - Effect: Allow
          Principal: 
            Service: 
            - ec2.amazonaws.com
          Action: 
          - 'sts:AssumeRole'
      ManagedPolicyArns: 
        - arn:aws:iam::aws:policy/service-role/AmazonElasticMapReduceforEC2Role
      Path: /    

Answer 1

基于评论，解决方案是用作elasticmapreduce.amazonaws.com信任策略原理。