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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
+
+=====================================
+Support Watcher HA active-active Mode
+=====================================
+
+https://blueprints.launchpad.net/watcher/+spec/support-watcher-ha-active-active-mode
+
+Watcher Decision Engine and Applier currently don't support HA active-active mode.
+
+
+Problem description
+===================
+
+There is often more than one controller in the real environment.
+Watcher Decision Engine and Applier are deployed on the controller.
+Now there is only one active Watcher-decision-engine or Applier.
+Otherwise Watcher Decision Engines will make duplicate actionplans for
+CONTINUOUS audit. And we don't know which Applier is doing the actionplan.
+Another problem is how to sync Data Models of Decision Engines to each other.
+Now Decision Engine updates its Data Model based on notifications from Nova.
+If there are many Decision Engines, we need to find a way to broadcast
+notifications. One `solution`_ don't depend on notifications is to update
+CDM before each audit.
+
+Use Cases
+----------
+
+As an operator, I want to enable all Watcher-decision-engine and Applier on
+all controllers.
+
+
+Proposed change
+===============
+
+If we enable more than one Watcher Decision Engine, the question is how to
+know the relation between Audit and Watcher Decision Engine.
+We can add a new 'host' field to the Audit table to solve this question.
+When we update the audit state from PENDING to ONGOING, we set the host
+field to record the Watcher Decision Engine hostname.
+
+So, the changes will include:
+
+* Watcher Decision Engine CDM should consume notifications from Nova in
+  broadcast mode to make CDMs synced.
+
+* Add a new 'host' field to the audit table
+
+* Add a new 'host' field to the actionplan table
+
+* Record the host when updating the audit's state from PENDING to ONGOING
+
+* Record the host when updating the actionplan's state from PENDING to ONGOING
+
+* For CONTINUOUS audit, we need to check the host that running decision engine
+  and recorded host value in audit table. If they are different, just skip the
+  audit.
+
+* When starting Applier process, if there are ONGOING actionplan with the
+  same host, cancel these stale actionplans. Actions of these stale actionplans
+  should also be marked as CANCELLED.
+
+* Action Plan includes different resources which are represented in Actions.
+  If user wants to run more than one action plan at the same time,
+  Watcher should check whether new action plan's resources overlaps with
+  already running one or not. If so, Watcher should prevent running of new
+  Action Plan by raising appropriate error.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+* Add a new 'host' filed in the audit table
+
+* Add a new 'host' filed in the actionplan table
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+Add 'host' field to AuditPayload, ActionPlanPayload
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  alexchadin
+Other contributors:
+  licanwei
+
+
+Work Items
+----------
+
+* Add broadcast notifications for DE
+
+* Update database to add a new field 'host'
+
+* Record host when changing state from PENDING to ONGOING
+
+* Add checking host for CONTINUOUS audit
+
+* Check stale actonplans when starting Applier
+
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+Unittest for each change.
+
+
+Documentation Impact
+====================
+
+Appropriate documentation should be added with new HA
+section.
+
+
+References
+==========
+
+None
+
+
+History
+=======
+
+None
+
+.. _commit: https://review.openstack.org/#/c/551963
+.. _solution: https://blueprints.launchpad.net/watcher/+spec/sync-datamodel-before-audit-execution