Docs and fixes

playbooks/roles/cassandra/LICENSE

-The MIT License
-
-Copyright (c) 2014 Pieterjan Vandaele
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.

playbooks/roles/cassandra/README.md

-Heavily modified from...
-
-## ANXS - cassandra
-
-Ansible role which installs and configures Apache Cassandra.
-
-#### License
-
-This directory is licensed under the MIT License. See the LICENSE file for details.

playbooks/roles/cassandra/defaults/main.yml

-
+---
 cassandra_version: "2.0.14"
-cassandra_source_url: "http://archive.apache.org/dist/cassandra/{{cassandra_version}}/apache-cassandra-{{cassandra_version}}-bin.tar.gz"
 
 # AFAIK there's no way to detect instance storage after the instaces has started.
 # Therefore, you MUST know the device names ahead of time.
+# If this is empty, no disks will be mounted and data will be put on the root volume.
 cassandra_ephemeral_disks: []
 #cassandra_ephemeral_disks: ["/dev/xvdb", "/dev/xvdc"]
 
 cassandra_data_dir_prefix: /var/lib/cassandra/data
+
 #should be parallel to cassandra_ephemeral_disks if there are any
 cassandra_data_dirs: ["data.1"]
 
@@ -15,12 +16,10 @@ cassandra_data_dirs: ["data.1"]
 cassandra_user: "cassandra"
 cassandra_group: "cassandra"
 
-cassandra_home: "{{ COMMON_APP_DIR }}/{{cassandra_user}}"
-
 # cassandra.yaml basic configuration parameters
 cassandra_cluster_name: "Test Cluster"
 
-#Set this!
+#Set this unless you want your node to only listen locally.
 cassandra_seeds: ["127.0.0.1"]
 
 #should eventually use EC2Snitch

playbooks/roles/cassandra/meta/main.yml

-# file: cassandra/meta/main.yml
-
+---
 dependencies:
   - common
   - oraclejdk
\ No newline at end of file

playbooks/roles/cassandra/tasks/main.yml

+---
+#
+# edX Configuration
+#
+# github:     https://github.com/edx/configuration
+# wiki:       https://github.com/edx/configuration/wiki
+# code style: https://github.com/edx/configuration/wiki/Ansible-Coding-Conventions
+# license:    https://github.com/edx/configuration/blob/master/LICENSE.TXT
+#
+#
+#
+# Tasks for role cassandra
+#
+# Overview:
+#
+# This role sets up a cassandra node.
 
 - name: Unmount disks mounted to the wrong place
   mount: