Add Networkx Performance Improvement blueprint spec

Change-Id: I887843722415269be5577387ad59970230380a57

specs/mitaka/networkx-performance-improvement.rst

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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
+
+================================
+NetworkX Performance Improvement
+================================
+
+https://blueprints.launchpad.net/vitrage/+spec/networkx-performance-improvement
+
+Many CRUD operations can be performed on the Entity Graph simultaneously. This can cause inconsistency regarding the resources and states on the graph.
+
+Problem description
+===================
+
+Many CRUD operations can be performed on the Entity Graph simultaneously. This can cause inconsistency regarding the resources and states on the graph.
+
+Proposed change
+===============
+
+We would like to have graph versioning, which will held two copies of the Entity Graph: (1) Stable copy of the last consistent graph, and (2) Dynamic copy of the graph which is updated by the Vitrage Resource Processor. Every set interval the changes inserted to the dynamic graph will be updated to the stable graph, resulting in the stable graph being up to date.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Pipeline impact
+---------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance/Scalability Impacts
+-------------------------------
+
+None
+
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+	alexey_weyl <alexey.weyl@alcatel-lucent.com>
+
+Work Items
+----------
+
+None
+
+Future lifecycle
+================
+
+None
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+This change needs to be tested by unit tests.
+
+Documentation Impact
+====================
+
+
+References
+==========
+