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<p class="MsoNormal"><span style="color:#1F497D">Elisha,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks for your detail explanation. I think I can understand how Vitrage works now.
</span><span style="font-family:Wingdings;color:#1F497D">J</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Since Vitrage needs to read data from different data sources and build one Entity Graph, the elasticity of vitrage-grpah process will be a big challenge per my understanding.
</span><span style="font-family:Wingdings;color:#1F497D">J</span><span style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks again,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tony<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> EXT Rosensweig, Elisha (Nokia - IL) [mailto:elisha.rosensweig@nokia.com]
<br>
<b>Sent:</b> Wednesday, April 20, 2016 12:26 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Vitrage] questions about "relationships"<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi Tony,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Glad to help </span><span style="font-family:Wingdings;color:#1F497D">J</span><span style="color:#1F497D"> . Regarding your questions from the last two emails:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l3 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Yes, the Entity Graph (what you called the global graph), is generated regardless of what templates were defined. You can get this graph using the CLI command "vitrage topology show", and we are currently
in the finishing stages of also having Horizon support for this that displays the graph.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l3 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Yes, the template definitions have no
<u>direct</u> impact on the Entity Graph. The impact on the Entity Graph is only via the template actions (see answer for next question)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l3 level1 lfo2"><![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">The "add causal relationship" will indeed add an edge to the Entity graph, between vertices already in the graph. Other actions, like raise_alarm, can cause vitrage to raise an alarm which will be added
into the graph as well.<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D">As a result, depending on the templates you add, the graph could indeed become very "dense" with edges. As Vitrage matures, it might also support many more types of relationships and entities, and the
graph will grow accordingly.<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D">We've given much thought to this issue, and have plans on addressing possible problems that this could cause. For example, the Entity Graph is currently in-memory, and we have plans for supporting also
persistant-DB implementations, e.g., Neo4J, Titan.<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D">As for your last question, yes – that is what the EvaluatorEventTransformer handles.
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:5.25pt"><span style="color:#1F497D">Keep those questions coming…<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:5.25pt"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:5.25pt"><span style="color:#1F497D">Elisha<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:5.25pt"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> EXT Wang, Tony T (Nokia - CN) [<a href="mailto:tony_t.wang@nokia.com">mailto:tony_t.wang@nokia.com</a>]
<br>
<b>Sent:</b> Tuesday, April 19, 2016 5:37 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Vitrage] questions about "relationships"<o:p></o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">One more question, I suppose “EvaluatorEventTransformer” is used to handle events sent by ScenarioEvaluator, and add/delete vertex/edge to the “global graph” triggered by Actions. Is it right?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> EXT Wang, Tony T (Nokia - CN) [<a href="mailto:tony_t.wang@nokia.com">mailto:tony_t.wang@nokia.com</a>]
<br>
<b>Sent:</b> Tuesday, April 19, 2016 10:01 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Vitrage] questions about "relationships"<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi Elisha,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks for your quick response. I think I got your points.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">To double confirm, further questions are coming
</span><span style="font-family:Wingdings;color:#1F497D">J</span><span style="color:#1F497D">:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">Regardless if there is template definition, Vitrage constructs a graph based on the data from plugins defined in datasources conf. Let’s call it “global graph”. Is it right?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">“entities” and “relationships” defined in template “definitions” won’t add any new vertex and edge to the “global graph”. They are only used to be referred by “condition”/”action” in “scenarios” section.
“condition” also uses them to construct another graph(“ScenarioEvaluator._evaluate_and_condition”), let’s call it “template graph”. This template graph is used to find occurrences of a template graph in the “global” graph(“NXAlgorithm.sub_graph_matching”).
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l0 level1 lfo4">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">If so, which graph will be applied by the actions by ScenarioEvaluator?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt"><span style="color:#1F497D">For example, will “AddCausalRelationship” add “causes” edge to the “global graph” or “template graph”?<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:18.0pt"><span style="color:#1F497D">I suppose it should be “global graph”. If so, it is possible the “global graph” will grow very huge someday?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tony<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Rosensweig, Elisha (Nokia - IL)
<br>
<b>Sent:</b> Tuesday, April 19, 2016 7:00 PM<br>
<b>To:</b> Wang, Tony T (Nokia - CN); Weyl, Alexey (Nokia - IL); Afek, Ifat (Nokia - IL); Shamir, Ohad (Nokia - IL)<br>
<b>Subject:</b> RE: [Vitrage] questions about "relationships"<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Hi Tony,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks for your interest in Vitrage! Any questions you might have, please send us. You may also send them to the openstack mailing list, and we will answer there as well.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regarding your question: <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">In the templates, the definitions in the "definitions" section are used only by the scenario(s) within the template – the condition, as well as the action, might reference these.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">These templates are used for
<u>business logic</u> for the Scenario Evaluator, to detect patterns in the Entity Graph and perform subsequent actions.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l2 level1 lfo6"><![if !supportLists]><span style="font-family:Symbol;color:#1F497D"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#1F497D">On the other hand, the
<u>populating</u> of this Entity Graph is done via Datasources. In the Transformer of each datasource, we define how we want to integrate the data received into the Entity Graph, what labels each edge (=relationship) will have etc.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">For example, the InstanceTransformer will define that whenever we add an instance to the Entity Graph, the instance is related to it's host with a "contains" relationship. The template, on the other hand, states
"IF there is a host in error AND this host contains an instance, THEN do XXX".<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">So indeed, we need the conditions in the template to use the same "language" as the transformers do, for example in using the labels. Currently, this mapping is implicitly assumed to be identical (i.e., the two
use the same labels). In the future we will probably add a mapping configuration file, which maps the transformer values to those in the templates.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Is this clear? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Elisha<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Wang, Tony T (Nokia - CN)
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<b>Sent:</b> Tuesday, April 19, 2016 1:13 PM<br>
<b>To:</b> Wang, Tony T (Nokia - CN); Weyl, Alexey (Nokia - IL); Afek, Ifat (Nokia - IL); Rosensweig, Elisha (Nokia - IL); Shamir, Ohad (Nokia - IL)<br>
<b>Subject:</b> RE: [Vitrage] questions about "relationships"<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Looks like “EvaluatorEventTransformer._create_neighbors” is used to create the edge for relationship.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Is so, is it overlapped to define the relationship between “nova.instance” and “nova.host” since “InstanceTransformer._create_host_neighbor” should do the same work?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tony<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Wang, Tony T (Nokia - CN)
<br>
<b>Sent:</b> Tuesday, April 19, 2016 5:35 PM<br>
<b>To:</b> 'alexey.weyl@nokia.com'; 'ifat.afek@nokia.com'; 'elisha.rosensweig@nokia.com'; 'ohad.shamir@nokia.com'<br>
<b>Subject:</b> [Vitrage] questions about "relationships"<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I found Vitrage is an very impressive OpenStack project! <span style="font-family:Wingdings">
J</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have a few questions about the example:<o:p></o:p></p>
<p class="MsoNormal"><a href="https://github.com/openstack/vitrage/blob/master/doc/source/vitrage-template-format.rst#example-1-basic-rca-and-deduced-alarmstate">https://github.com/openstack/vitrage/blob/master/doc/source/vitrage-template-format.rst#example-1-basic-rca-and-deduced-alarmstate</a><o:p></o:p></p>
<p class="MsoNormal">In this example, there is a “relationships” definition between nova host and nova instance:<o:p></o:p></p>
<p class="MsoNormal"><span style="color:#00B050">- relationship:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#00B050"> source: host<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#00B050"> target: instance<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#00B050"> relationship_type: contains<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#00B050"> template_id : host_contains_instance<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">My questions:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Is “relationship” used to create an edge or not?<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>I don’t find the code for edge creation from “relationship”. If not, the edge between “nova.host” and “nova.instance” should be created by function “InstanceTransformer._create_host_neighbor”. Right?<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:18.0pt;text-indent:-18.0pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style="mso-list:Ignore">3.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>If so, what’s the purpose for “relationship”? Is it only used to parse the “condition” part in “scenarios”?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks in advance,<o:p></o:p></p>
<p class="MsoNormal">Tony<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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