namenode.yml

- hosts: namenode
  gather_facts: no
  vars_prompt:
    - name: "dir_nn"
      prompt: "NameNode directory"
      private: no
    - name: "IP_nn"
      prompt: "NameNode IP"
      private: no
  
  tasks:
    - name: "Installing jdk"
      command: "rpm -ivh jdk-8u171-linux-x64.rpm"
      ignore_errors: yes
      register: java
    - debug:
        var: java.stdout
 
    - name: "hadoop software installation"
      command: "rpm -ivh hadoop-1.2.1-1.x86_64.rpm --force"
      register: hadoop
      ignore_errors: yes
      when: java.rc==0
    - debug:
        var: hadoop.stdout

    - name: "Configuring hdfs-site.xml"
      blockinfile:
        path: /etc/hadoop/hdfs-site.xml
        insertafter: "<configuration>"
        block:
          <property>
          <name>dfs.name.dir</name>
          <value>{{ dir_nn }}</value>
          </property>

    - name: "Configuring core-site.xml"
      blockinfile:
        path: /etc/hadoop/core-site.xml
        insertafter: "<configuration>"
        block:
          <property>
          <name>fs.default.name</name>
          <value>hdfs://{{ IP_nn }}:9001</value>
          </property>

    - name: Creating a NameNode directory
      file:
        state: directory
        path: "{{ dir_nn }}"

    - name: Format NameNode directory
      shell: "echo Y |  hadoop namenode -format"
      ignore_errors: yes
      register: format
    - debug:
        var: format

    - name: "stopping NameNode Service"
      shell: "hadoop-daemon.sh stop namenode"
      ignore_errors: yes

    - name: "starting NameNode Service"
      shell: "hadoop-daemon.sh start namenode"
      ignore_errors: yes
      register: service
    - debug:
        var: service.stdout

    - name: "Checking Java Process"
      shell: "jps"
      register: jps
    - debug:
        var: jps.stdout_lines