---
# Playbook for  Hadoop slave servers

- name: Install the datanode and tasktracker packages
  yum: name=${item} state=installed
  with_items: 
   - hadoop-0.20-mapreduce-tasktracker
   - hadoop-hdfs-datanode

- name: Copy the hadoop configuration files
  template: src=roles/common/templates/hadoop_ha_conf/${item}.j2 dest=/etc/hadoop/conf/${item}
  with_items: 
   - core-site.xml
   - hadoop-metrics.properties
   - hadoop-metrics2.properties
   - hdfs-site.xml
   - log4j.properties
   - mapred-site.xml
   - slaves
   - ssl-client.xml.example
   - ssl-server.xml.example
  when_unset: $ha_disabled
  notify: restart hadoop slave services

- name: Copy the hadoop configuration files for non ha
  template: src=roles/common/templates/hadoop_conf/${item}.j2 dest=/etc/hadoop/conf/${item}
  with_items: 
   - core-site.xml
   - hadoop-metrics.properties
   - hadoop-metrics2.properties
   - hdfs-site.xml
   - log4j.properties
   - mapred-site.xml
   - slaves
   - ssl-client.xml.example
   - ssl-server.xml.example
  when_set: $ha_disabled
  notify: restart hadoop slave services

- name: Create the data directory for the slave nodes to store the data
  file: path=${item} owner=hdfs group=hdfs state=directory
  with_items: ${hadoop.dfs_datanode_data_dir}

- name: Create the data directory for the slave nodes for mapreduce
  file: path=${item} owner=mapred group=mapred state=directory
  with_items: ${hadoop.mapred_local_dir}

- name: start hadoop slave services
  service: name=${item} state=restarted
  with_items:
    - hadoop-0.20-mapreduce-tasktracker
    - hadoop-hdfs-datanode