hadoop-configuration.yml

#configure namenode
- name: "configure namenode"
  hosts: hadoop_namenode
  tags:
    - "namenode"
  vars:
    user_dir: "{{ ansible_facts['user_dir'] }}"
  vars_files:
    - vars.yml
    - namenode/vars.yml

  tasks:  
  - name: "Create namenode directory"
    file:
      path: "{{ user_dir}}{{namenode_directory}}"
      state: directory

  - name: "copy core-site.xml file"
    template:
      src: "namenode/core-site.xml" 
      dest: "/etc/hadoop/core-site.xml"
  
  - name: "copy hdfs-site.xml file"
    template:
      src: "namenode/hdfs-site.xml" 
      dest: "/etc/hadoop/hdfs-site.xml"
 
  - name: "Format Namenode"
    shell: "echo Y | hadoop namenode -format"
  - name: "start hadoop namenode"
    shell: "hadoop-daemon.sh start namenode"


#configure datanode
- name: "configure datanode"
  hosts: hadoop_datanode
  tags:
    - "datanode"
  vars:
  - user_dir: "{{ ansible_facts['user_dir'] }}"
  vars_files:
    - vars.yml
    - datanode/vars.yml

  tasks:  
  - name: "Create datanode directory"
    file:
      path: "{{ user_dir}}{{namenode_directory}}"
      state: directory

  - name: "copy core-site.xml file"
    template:
      src: "datanode/core-site.xml" 
      dest: "/etc/hadoop/core-site.xml"
  
  - name: "copy hdfs-site.xml file"
    template:
      src: "datanode/hdfs-site.xml" 
      dest: "/etc/hadoop/hdfs-site.xml"
 
  - name: "start hadoop datanode"
    shell: "hadoop-daemon.sh start datanode"