---
# HDFS datanode
- name: Ensure that the hdfs data disks are mounted
  mount: name={{ item.mountpoint }} src=/dev/{{ item.device }} fstype={{ item.fstype }} state=mounted
  with_items: hadoop_hdfs_data_disk
  when: ansible_fqdn | match ("node.*\.t\.hadoop\.research\-infrastructures\.eu")
  tags:
    - hdfs
    - datanodes
    - disk

- name: Set the vm.swappiness parameter
  sysctl: name=vm.swappiness value={{ worker_node_swappiness }} sysctl_file=/etc/sysctl.d/90-swappiness.conf state=present reload=yes
  when: ansible_fqdn | match ("node.*\.t\.hadoop\.research\-infrastructures\.eu")
  tags:
    - hdfs
    - datanodes

- name: Install the HDFS datanode config files.
  template: src=templates/{{ item }}.j2 dest={{ hadoop_conf_dir }}/{{ item }} owner=root group=root mode=0444
  with_items:
    - core-site.xml
  notify:
    - Restart HDFS datanode
  tags:
    - datanode
    - hdfs

- name: Ensure that the hdfs shortcircuit cache directory exists
  file: dest={{ hdfs_read_shortcircuit_cache_dir }} state=directory owner=hdfs group=hdfs mode=0755
  when:
    - ansible_fqdn | match ("node.*\.t\.hadoop\.research\-infrastructures\.eu")
    - hdfs_read_shortcircuit
  tags:
    - datanode
    - hdfs
  
- name: Install the HDFS datanode config files.
  template: src=templates/datanode-hdfs-site.xml.j2 dest={{ hadoop_conf_dir }}/hdfs-site.xml owner=root group=root mode=0444
  notify:
    - Restart HDFS datanode
  tags:
    - datanode
    - hdfs
    - hdfs_site

- name: Check if the hadoop-jmx conf directory exists
  stat: path=/etc/hadoop-jmx/conf
  register: check_jmx_confdir

- name: Distribute the jmx authorization files for hadoop hdfs
  template: src=templates/jmxremote.passwd.j2 dest=/etc/hadoop-jmx/conf/jmxremote.passwd owner=hdfs mode=0600
  when: check_jmx_confdir.stat.exists and hadoop_jmx_enabled
  notify:
    - Restart HDFS datanode
  tags:
    - hadoop
    - hdfs
    - jmx

- name: Distribute the jmx role files for hadoop hdfs
  copy: src=files/jmxremote.access dest=/etc/hadoop-jmx/conf/jmxremote.access owner=root mode=0644
  when: check_jmx_confdir.stat.exists and hadoop_jmx_enabled
  notify:
    - Restart HDFS datanode
  tags:
    - hadoop
    - hdfs
    - jmx