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

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- name: Check if JournalNode is running
  shell: jps | grep "JournalNode" | grep -v grep
  ignore_errors: yes
  changed_when: false
  register: journalnode_status

- name: "start journalnode"
  command: "nohup {{ hadoop_home }}/sbin/hadoop-daemon.sh start journalnode"
  when: journalnode_status.rc == 1