hadoop-ansible/roles/hadoop_hdfs_datanodes_config/handlers/main.yml

---
# TODO: find a better condition for the restart
#
- name: Restart HDFS datanode
  service: name=hadoop-hdfs-datanode state=restarted sleep=20
  when: ansible_fqdn | match ("node.*\.t\.hadoop\.research\-infrastructures\.eu")
  ignore_errors: true