您可以使用此ansible playbook执行任务。
停止Yarn服务。

- name: service hadoop-mapreduce-historyserver stop
  service: 
    name: hadoop-mapreduce-historyserver
    state: stopped

- name: service hadoop-yarn-resourcemanager stop
  service: 
    name: hadoop-yarn-resourcemanager
    state: stopped

- name: service hadoop-yarn-nodemanager stop
  service: 
    name: hadoop-yarn-nodemanager
    state: stopped

登录到所有节点并删除用户缓存目录的内容。

- name: delete the content of the usercache directories
   file: path="{{ item }}" state=absent
   with_fileglob:
       - /prod/HDOP/data/13/daas.na/yarn/nm/usercache/*

验证所有节点中的所有用户缓存目录是否为空。

- name:  Verify all usercache directories are empty.
    shell: /usr/bin/ls ~/soniya/ | wc -l
    register: total_size

  - debug:
         msg: "Directory total size is {{ total_size.stdout_lines }}"
        when: total_size.rc == 0

启动Yarn服务。

- name: service hadoop-mapreduce-historyserver start
  service: 
    name: hadoop-mapreduce-historyserver
    state: started

- name: service hadoop-yarn-resourcemanager start
  service: 
    name: hadoop-yarn-resourcemanager
    state: started

- name: service hadoop-yarn-nodemanager start
  service: 
    name: hadoop-yarn-nodemanager
    state: started

将“Yarn缓存已刷新”消息发送到我们的组id
您可以使用邮件模块进行此操作。