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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+==============================================
+Add central agent HA and workload partitioning
+==============================================
+
+https://blueprints.launchpad.net/fuel/+spec/ceilometer-central-agent-ha
+
+Implement Redis installation and using it as a coordination backend
+for ceilometer central agents
+
+Problem description
+===================
+
+A detailed description of the problem:
+
+* Currentrly ceilometer central agent is the only one ceilometer component
+  that didn't support HA and workload partitioning. During Juno release
+  cycle this feature was intorduced to the ceilometer in the upstream code
+  using tooz coordination openstack library. This library supports several
+  backends (zookeeper, redis, memcached among them). It was decided
+  to introduce this built-in ceilometer feature to MOS as well.
+  Redis was chosen as the coordination backend.
+
+Proposed change
+===============
+
+This feature is experimental and should be implemented as fuel-plugin.
+It's implementation requires following things to be done:
+* Implement Redis installation on controller nodes only in HA mode
+* Prepare Redis packages and it's dependencies
+* Configure ceilometer central agents to work with redis
+
+Installation diagram is as follows
+
+::
+
+ +---------------------+
+ |                     |
+ |  +---------------+  |
+ |  |  ceilometer   +-------------------------+
+ |  | central agent |  |                      |
+ |  +---------------+  |                      |
+ |                     |                      |
+ |  Primary controller |                      |
+ |                     |                      |
+ |  +---------------+  |                      |
+ |  |     redis     <------------------------------+
+ |  |     master    |  |                      |    |
+ |  +---------------+  |                      |    |
+ |                     |                      |    |
+ +---------------------+                      |    |
+                                              |    |
+ +---------------------+                      |    |
+ |                     |                      |    |
+ |  +---------------+  |                      |    |
+ |  |  ceilometer   +-------------------------+    |
+ |  | central agent |  |                      |    |
+ |  +---------------+  |                      |    |
+ |                     |               +------v----+--+
+ |     controller 1    |               |              |
+ |                     |               | Coordination |
+ |  +---------------+  |               |              |
+ |  |     redis     |  |               +------^----+--+
+ |  |     slave1    |  |                      |    |
+ |  |               <------------------------------+
+ |  +---------------+  |                      |    |
+ |                     |                      |    |
+ +---------------------+                      |    |
+                                              |    |
+ +---------------------+                      |    |
+ |                     |                      |    |
+ |  +---------------+  |                      |    |
+ |  |  ceilometer   +-------------------------+    |
+ |  | central agent |  |                           |
+ |  +---------------+  |                           |
+ |                     |                           |
+ |     controller 2    |                           |
+ |                     |                           |
+ |  +---------------+  |                           |
+ |  |     redis     |  |                           |
+ |  |     slave2    <------------------------------+
+ |  |               |  |
+ |  +---------------+  |
+ |                     |
+ +---------------------+
+
+
+Alternatives
+------------
+
+This feature could be implemented by default, but it has experimental status.
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Upgrade impact
+--------------
+
+These changes will be needed in puppet scripts:
+
+* Add redis module
+
+* Configure ceilometer central agent to use redis as backend
+
+This change will be needed in packages:
+
+* Use upstream Redis packages and it's dependencies
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+This could be installed only in HA mode with ceilometer
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  Ivan Berezovskiy
+
+Other contributors:
+  Dina Belova
+
+Reviewer:
+  Vladimir Kuklin Sergii Golovatiuk
+
+QA:
+  Vadim Rovachev
+
+Work Items
+----------
+
+* Implement redis installation from puppet (iberezovskiy)
+
+* Configure ceilometer central agent (iberezovskiy)
+
+* Write a documentation (dbelova)
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+Testing approach:
+
+* Environment with ceilometer in HA mode should be succesfully deployed
+
+* Ceilometer should collect all enabled polling meters for deployed
+  environment
+
+* Polling meters should be divided on groups by ceilometer central agents
+
+* Redis cluster should be with one master and two slaves
+
+* Ensure that after one central agent was broken, during the next polling
+  cycle all measurements will be rescheduled between two another,
+  and still all of them will be collected
+
+* Ensure that after node with redis master was broken ceilometer central
+  agents can work with new redis master and can poll meters
+
+Documentation Impact
+====================
+
+A note should be added about redis plugin installation and
+how ceilometer agent can work in HA mode
+
+References
+==========
+
+None