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<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 lfo5">
<![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 lfo5">
<![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 lfo5">
<![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
</span><span style="color:#1F497D">ScenarioEvaluator?</span><span style="color:#1F497D"><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?</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,<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>
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<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 lfo2"><![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 lfo2"><![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 lfo2"><![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)
<br>
<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 lfo4">
<![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 lfo4">
<![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 lfo4">
<![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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