- block:
    - name: copy unload_hadoop_yarn.sh to {{ deploy_dir }}/
      template: 
        src: 'unload_hadoop_yarn.sh.j2'
        dest: '{{ deploy_dir }}/unload_hadoop_yarn.sh'
        force: true
        mode: 0755
        
    - name: unload hadoop
      shell: cd {{ deploy_dir }} && sh unload_hadoop_yarn.sh
      
    - name: Ansible delete {{ deploy_dir }}/unload_hadoop_yarn.sh
      file:
        path: "{{ deploy_dir }}/unload_hadoop_yarn.sh"
        state: absent

    - name: Ansible delete old /etc/profile.d/flink.sh
      file:
        path: '/etc/profile.d/flink.sh'
        state: absent
        
    - name: Checking ZooKeeper has yarn nodes
      shell: "docker exec zookeeper zkCli.sh ls / | grep rmstore | wc -l"
      run_once: true
      delegate_to: "{{ groups.zookeeper[0] }}"
      register: rmstore_zknode
      
    - name: Delete Hadoop nodes in ZooKeeper
      shell: "docker exec zookeeper zkCli.sh rmr /rmstore"
      run_once: true
      delegate_to: "{{ groups.zookeeper[0] }}"
      when: rmstore_zknode.stdout >= '1'

    - name: Checking ZooKeeper has yarn nodes
      shell: docker exec zookeeper zkCli.sh ls / | grep "yarn-leader-election" | wc -l
      run_once: true
      delegate_to: "{{ groups.zookeeper[0] }}"
      register: leader_zknode
      
    - name: Delete Hadoop nodes in ZooKeeper
      shell: "docker exec zookeeper zkCli.sh rmr /yarn-leader-election"
      run_once: true
      delegate_to: "{{ groups.zookeeper[0] }}"
      when: leader_zknode.stdout >= '1'
      
    - name: Check if the Hadoop service already exists
      shell: source /etc/profile && jps -l | egrep "org.apache.hadoop.yarn.server.resourcemanager.ResourceManager|org.apache.hadoop.yarn.server.nodemanager.NodeManager|org.apache.hadoop.mapreduce.v2.hs.JobHistoryServer" | 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'