- block:
    - name: copy unload_hdfs.sh to {{ deploy_dir }}/
      template: 
        src: 'unload_hdfs.sh.j2'
        dest: '{{ deploy_dir }}/unload_hdfs.sh'
        force: true
        mode: 0755
        
    - name: unload hadoop
      shell: cd {{ deploy_dir }} && sh unload_hdfs.sh
      
    - name: Ansible delete {{ deploy_dir }}/unload_hdfs.sh
      file:
        path: "{{ deploy_dir }}/unload_hdfs.sh"
        state: absent
        
    - name: Checking ZooKeeper has Hadoop nodes
      shell: docker exec zookeeper zkCli.sh ls / | grep -w "hadoop-ha" | wc -l
      run_once: true
      delegate_to: "{{ groups.zookeeper[0] }}"
      register: has_zknode
      
    - name: Delete Hadoop nodes in ZooKeeper
      shell: "docker exec zookeeper zkCli.sh rmr /hadoop-ha"
      run_once: true
      delegate_to: "{{ groups.zookeeper[0] }}"
      when: has_zknode.stdout >= '1'
      
    - name: Check if the Hadoop service already exists
      shell: source /etc/profile && jps -l | egrep "org.apache.hadoop.hdfs.qjournal.server.JournalNode|org.apache.hadoop.hdfs.tools.DFSZKFailoverController|org.apache.hadoop.hdfs.server.datanode.DataNode|org.apache.hadoop.hdfs.server.namenode.NameNode" | wc -l
      register: check_out
      
    - name: To terminate execution
      fail:
       msg: "卸载失败，组件可能非本安装部署，请手动卸载后继续安装"
      run_once: true
      delegate_to: 127.0.0.1 
      when: check_out.stdout >= '1'