ansible/roles/hadoop/tasks/start-jhs.yml

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- name: Check if JobHistoryServer is running
  shell: jps | grep "JobHistoryServer"
  ignore_errors: yes
  changed_when: false
  register: jhs_status

- name: Start Job History Server on Hadoop 3.x
  command: "nohup {{ hadoop_home }}/bin/mapred --daemon start historyserver"
  when: jhs_status.rc == 1 and hadoop_major_version == '3'

- name: Start Job History Server on Hadoop 2.x
  command: "nohup {{ hadoop_home }}/sbin/mr-jobhistory-daemon.sh start historyserver"
  when: jhs_status.rc == 1 and hadoop_major_version == '2'