LAM-33 Created variables for the mirror, version and installation path in apache-kafka role.

ansible/roles/apache-kafka/handlers/main.yml

 ---
 - name: create topics
-  shell: /usr/local/kafka/bin/kafka-topics.sh --create --zookeeper {{ hostvars['master-node']['master_node_ip'] }}:2181 --replication-factor {{ groups['slaves']|count + 1 }} --partitions 1 --topic input
+  shell: "{{ installation_path }}/kafka/bin/kafka-topics.sh --create --zookeeper {{ hostvars['master-node']['master_node_ip'] }}:2181 --replication-factor {{ groups['slaves']|count + 1 }} --partitions 1 --topic input"
   notify:
     - create batch output topic
 
 - name: create batch output topic
-  shell: /usr/local/kafka/bin/kafka-topics.sh --create --zookeeper {{ hostvars['master-node']['master_node_ip'] }}:2181 --replication-factor {{ groups['slaves']|count + 1 }} --partitions 1 --topic batch-output
+  shell: "{{ installation_path }}/kafka/bin/kafka-topics.sh --create --zookeeper {{ hostvars['master-node']['master_node_ip'] }}:2181 --replication-factor {{ groups['slaves']|count + 1 }} --partitions 1 --topic batch-output"
   notify:
     - create stream output topic
 
 - name: create stream output topic
-  shell: /usr/local/kafka/bin/kafka-topics.sh --create --zookeeper {{ hostvars['master-node']['master_node_ip'] }}:2181 --replication-factor {{ groups['slaves']|count + 1 }} --partitions 1 --topic stream-output
+  shell: "{{ installation_path }}/kafka/bin/kafka-topics.sh --create --zookeeper {{ hostvars['master-node']['master_node_ip'] }}:2181 --replication-factor {{ groups['slaves']|count + 1 }} --partitions 1 --topic stream-output"
 

ansible/roles/apache-kafka/tasks/download.yml

 ---
   - name: Download Apache Kafka.
-    get_url: url=http://mirrors.myaegean.gr/apache/kafka/0.8.2.1/kafka_2.10-0.8.2.1.tgz dest=/root/kafka_2.10-0.8.2.1.tgz
+    get_url: url="{{ mirror_url }}/{{ version }}/kafka_{{ scala_version }}-{{ version }}.tgz" dest="{{ download_path }}/kafka_{{ scala_version }}-{{ version }}.tgz"
     tags:
       - download
 
   - name: Uncompress Apache Kafka.
-    unarchive: src=/root/kafka_2.10-0.8.2.1.tgz dest=/usr/local copy=no
+    unarchive: src="{{ download_path }}/kafka_{{ scala_version }}-{{ version }}.tgz" dest="{{ installation_path }}" copy=no
     tags:
       - download
 
   - name: Create softlink for Apache Kafka.
-    file: src=/usr/local/kafka_2.10-0.8.2.1 dest=/usr/local/kafka state=link
+    file: src="{{ installation_path }}/kafka_{{ scala_version }}-{{ version }}" dest="{{ installation_path }}/kafka" state=link
     tags:
       - download
 

ansible/roles/apache-kafka/tasks/master.yml

 ---
   - name: Configure Apache kafka.
-    copy: src=usr/local/kafka/config/server.properties dest=/usr/local/kafka/config/server.properties owner=root group=root mode=0644
+    copy: src=server.properties dest="{{ installation_path }}/kafka/config/server.properties" owner=root group=root mode=0644
     tags:
       - configure-kafka
 
   - name: Start Apache Zookeeper server.
-    shell: /usr/local/kafka/bin/zookeeper-server-start.sh /usr/local/kafka/config/zookeeper.properties
+    shell: "{{ installation_path }}/kafka/bin/zookeeper-server-start.sh {{ installation_path }}/kafka/config/zookeeper.properties"
     async: 31536000 # Stay alive for a year(1 year = 31536000 seconds).
     poll: 0
     tags:
@@ -17,7 +17,7 @@
       - start-zookeeper
 
   - name: Start Apache Kafka server.
-    shell: /usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties
+    shell: "{{ installation_path }}/kafka/bin/kafka-server-start.sh {{ installation_path }}/kafka/config/server.properties"
     async: 31536000 # Stay alive for a year(1 year = 31536000 seconds).
     poll: 0
     tags:

ansible/roles/apache-kafka/tasks/slaves.yml

 ---
   - name: Configure Apache kafka.
-    template: src=usr/local/kafka/config/server.properties.j2 dest=/usr/local/kafka/config/server.properties owner=root group=root mode=0644
+    template: src=server.properties.j2 dest="{{ installation_path }}/kafka/config/server.properties" owner=root group=root mode=0644
     tags:
       - configure-kafka
 
   - name: Start Apache Kafka server.
-    shell: /usr/local/kafka/bin/kafka-server-start.sh /usr/local/kafka/config/server.properties
+    shell: "{{ installation_path }}/kafka/bin/kafka-server-start.sh {{ installation_path }}/kafka/config/server.properties"
     async: 31536000 # Stay alive for a year(1 year = 31536000 seconds).
     poll: 0
     tags:

ansible/roles/apache-kafka/vars/main.yml

+---
+mirror_url: "http://mirrors.myaegean.gr/apache/kafka"
+scala_version: "2.10"
+version: "0.8.2.1"
+download_path: "/root"
+installation_path: "/usr/local"
+