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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Hello Tim and all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"> The Delegation method can solve domain problems which located in on domain. I think we may face to more inter-domain policies which can
not be well handled by either domain.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"> I recommend in the future Congress may have right to access many domain db and running multiple solver instances to find conflict, solve
problem and trigger domain module to operate. This may be a better architecture serving openstack in a long way.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">BR<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D">Oliver<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.0pt;font-family:"Calibri","sans-serif";color:#1F497D">---------------------------<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span lang="EN-US" style="font-size:8.0pt;font-family:"Calibri","sans-serif";color:black">Huangyong (Oliver)<o:p></o:p></span></p>
<p class="MsoNormal" style="text-align:justify;text-justify:inter-ideograph"><span lang="EN-US" style="font-size:8.0pt;font-family:"Calibri","sans-serif";color:black">Network research, Huawei</span><span lang="EN-US" style="font-size:8.0pt;font-family:"Calibri","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Tim Hinrichs [mailto:thinrichs@vmware.com]
<br>
<b>Sent:</b> Tuesday, March 03, 2015 1:26 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Congress][Delegation] Initial workflow design<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Hi Yali, <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Would you mind writing up what you’re thinking and putting it into the Delegation google doc? (I also put this request in a response to Ruby’s email.) Maybe add a section called “Integration with Nova solver-scheduler”.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">I’d love to see an example worked through—that usually helps me understand the nuances. In what you write below I’m a bit confused by who calls into who, where the policies live, etc.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Once we have something in the doc, I’d suggest we go through a couple rounds of comments/edits and then schedule a call with everyone interested to discuss.<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US">Tim<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<span lang="EN-US">On Feb 27, 2015, at 11:18 AM, Yathiraj Udupi (yudupi) <<a href="mailto:yudupi@cisco.com">yudupi@cisco.com</a>> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">Hi, <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">It will be good to simplify the PoC scenario. In terms of policies and other constraints related to VM Placement, I guess we agree that not all policies/constraints have to originate
from the policy framework such as Congress. The existing placement engine logic that is present in the default Nova scheduler or say the Nova solver scheduler will be adding its own set of constraints to the placement calculations. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">My idea would be make the Nova placement engine, (for e.g., solver scheduler) talk to Congress to get the Datalog rules / translated LP constraints, based on the defined policies
pertaining to a particular tenant/user. This of course needs to be worked out in terms of translation logic, constraint specifications, etc. Also, this workflow will be part of the scheduling/Placement workflow as part of the Nova boot instance API call
(for the initial placement). <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">As the next phase, for migrations scenario, Congress can periodically trigger a check, if any of the violations/warnings are triggered, (corresponding tables getting populated, as
you show in your example), if so, then trigger migrations, which will have to go through another round of placement decisions for figuring out the best destinations, without violating the policies and other existing constraints. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">Happy to discuss more and simplify a PoC scenario. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">Thanks,<o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">Yathi. <o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif"">On 2/27/15, 6:40 AM, "<a href="mailto:ruby.krishnaswamy@orange.com">ruby.krishnaswamy@orange.com</a>" <<a href="mailto:ruby.krishnaswamy@orange.com">ruby.krishnaswamy@orange.com</a>>
wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US" style="font-size:8.5pt;font-family:"Calibri","sans-serif""><o:p> </o:p></span></p>
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<span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">My first suggestion: why don’t we set up call together with Ramki, Yathi, Debo, as soon as possible ?</span><span lang="FR"><o:p></o:p></span></p>
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<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:75.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="FR" style="font-family:"Calibri","sans-serif""><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">How to go forward concretely with the 8 steps for the PoC (details within each step),</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Including nova integration points</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:75.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2">
<![if !supportLists]><span lang="FR" style="font-family:"Calibri","sans-serif""><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Identify “friction points” in the details above to resolve for beyond PoC</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Tim: Where does the rest of the program originate? I’m not saying the entire LP program is generated from the Datalog constraints; some of it is generated by the solver independent
of the Datalog. In the text, I gave the example of defining hMemUse[j].</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Tim: The VM-placement engine does 2 things: (I) translates Datalog to LP and (ii) generates additional LP constraints. (Both work items could leverage any constraints that are builtin
to a specific solver, e.g. the solver-scheduler. The point is that there are 2 distinct, conceptual origins of the LP constraints: those that represent the Datalog and those that codify the domain.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Tim: Each domain-specific solver can do whatever it wants, so it’s not clear to me what the value of choosing a modeling language actually is—unless we want to build a library of
common functionality that makes the construction of domain-specific engine (wrappers) easier. I’d prefer to spend our energy understanding whether the proposed workflow/interface works for a couple of different domain-specific policy engines OR to flush this
one out and build it.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The value of choosing a modeling language is related to how “best to automate translations” from Datalog constraints (to LP)?</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">We can have look for one unique way of generation, and not, “some of it is generated by the VM-placement engine
<s>solver</s> independent of the Datalog”.</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:96.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level2 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Datalog imposes most constraints (== policies)</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:96.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level2 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Two constraints are not “policies”</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:132.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level3 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">A VM is allocated to only one host.</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:132.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level3 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Host capacity is not exceeded.</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Over subscription
</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Otherwise what was your suggestion? As follows?</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:96.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level2 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Use framework (extend) the nova-solver-scheduler currently implements (itself using PuLP). This framework specifies an API to write constraints and cost
functions (in a domain specific way). Modifying this framework:</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">To read data in from DSE</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:132.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level3 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">To obtain the cost function from Datalog (e.g. minimize Y[host1]…)</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:132.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level3 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">To obtain Datalog constraints (e.g. <75% memory allocation constraint for hosts of special zone)</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:96.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level2 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:"Courier New""><span style="mso-list:Ignore">o<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">We need to specify the “format” for this? It will likely to be a string of the form (?)</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">§<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">“hMemUse[0] – 0.75*hMemCap[0] < 100*y[0], “ Memory allocation constraint on Host 0“,
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">From your doc (page 5, section 4)</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New"">warning(id) :-</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> nova:host(id, name, service, zone, memory_capacity),</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> legacy:special_zone(zone),</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> ceilometer:statistics(id, "memory", avg, count, duration,
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New"">durstart, durend, max, min, period, perstart, perend,
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New"">sum, unit),</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> avg > 0.75 * memory_capacity</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US"> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US">Notice that this is a soft constraint, identified by the use of
</span><span lang="EN-US" style="font-family:"Courier New"">warning</span><span lang="EN-US"> instead of
</span><span lang="EN-US" style="font-family:"Courier New"">error</span><span lang="EN-US">. When compiling to LP, the VM-placement engine will attempt to minimize the number of rows in the
</span><span lang="EN-US" style="font-family:"Courier New"">warning</span><span lang="EN-US"> table. That is, for each possible row
</span><span lang="EN-US" style="font-family:"Courier New"">r</span><span lang="EN-US"> it will create a variable
</span><span lang="EN-US" style="font-family:"Courier New"">Y[r]</span><span lang="EN-US"> and assign it True if the row is a warning and False otherwise</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span>
<span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The policy (warning) : when will it be evaluated? This should be done periodically? Then if the table has even one True entry, then the action should be to generate the LP, solve,
activate the migrations etc.</span><span lang="FR"><o:p></o:p></span></p>
</div>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:60.0pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l4 level1 lfo4">
<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The “LP” cannot be generated when the VM-placement engine receives the policy snippet.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
</div>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Ruby</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De :</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Tim Hinrichs [<a href="mailto:thinrichs@vmware.com">mailto:thinrichs@vmware.com</a>]
<br>
<b>Envoyé :</b> jeudi 26 février 2015 19:17<br>
<b>À :</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Objet :</b> Re: [openstack-dev] [Congress][Delegation] Initial workflow design</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US"> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Inline.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<b><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:
</span></b><span lang="FR" style="font-size:11.0pt;font-family:"Calibri","sans-serif"">"<a href="mailto:ruby.krishnaswamy@orange.com">ruby.krishnaswamy@orange.com</a>" <<a href="mailto:ruby.krishnaswamy@orange.com">ruby.krishnaswamy@orange.com</a>><br>
<b>Reply-To: </b>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<b>Date: </b>Wednesday, February 25, 2015 at 8:53 AM<br>
<b>To: </b>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<b>Subject: </b>Re: [openstack-dev] [Congress][Delegation] Initial workflow design</span><span lang="FR"><o:p></o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt">
<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Hi Tim, All,</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
</div>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:60.75pt;margin-bottom:.0001pt;text-indent:-18.0pt;mso-list:l3 level1 lfo6">
<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Step 3: The VM-placement engine is also a “datalog engine” . Right?</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:60.75pt;margin-bottom:.0001pt">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">When policies are delegated:
</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:60.75pt;margin-bottom:.0001pt;text-indent:17.4pt">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">when policies are inserted? When the VM-placement engine has already registered itself all policies are given to it?</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:60.75pt;margin-bottom:.0001pt;text-indent:17.4pt">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US">“In our example, this would mean the domain-specific policy engine executes the following API call over the DSE”</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US">“domain-agnostic” ….</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:5.0pt;margin-left:60.75pt">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Done.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Step 4:</span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoListParagraph" style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:60.75pt;margin-bottom:.0001pt">
<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Ok</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">But finally: if Congress will likely “delegate”
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Not sure what you’re suggesting here.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Step 5: Compilation of subpolicy to LP in VM-placement engine</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">For the PoC, it is likely that the LP program ( in PuLP or some other ML) is *<b>not</b>* completely generated by compiler/translator.</span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Right?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Where does the rest of the program originate? I’m not saying the entire LP program is generated from the Datalog constraints; some of it is generated by the solver independent of the
Datalog. In the text, I gave the example of defining hMemUse[j].</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> You also indicate that some category of constraints (“</span><span lang="EN-US">the LP solver doesn’t know what the relationship between assign[i][j], hMemUse[j], and vMemUse[i]
actually is, so the VM-placement engine must also include constraints”) .</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US"> </span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">These constraints must be “explicitly” written?</span><span lang="EN-US">
</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">(e.g. max_ram_allocation etc that are constraints used in the solver-scheduler’s package).</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">The VM-placement engine does 2 things: (I) translates Datalog to LP and (ii) generates additional LP constraints. (Both work items could leverage any constraints that are builtin to
a specific solver, e.g. the solver-scheduler. The point is that there are 2 distinct, conceptual origins of the LP constraints: those that represent the Datalog and those that codify the domain.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> So what “parts” will be generated:
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> Cost function :
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> Constraint from Policy : memory usage < 75%
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> Then the rest should be “filled” up?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> Could we convene on an intermediary “modeling language”?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> @Yathi: do you think we could use some thing like AMPL ? Is this proprietary?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> A detail: the example “</span><span lang="EN-US" style="font-family:"Courier New"">Y[host1] = hMemUse[host1] > 0.75 * hMemCap[host1]</span><span lang="EN-US">”</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US"> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR" style="font-family:Wingdings"><span style="mso-list:Ignore">ð<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">To be changed to a linear form (mi – Mi > 0 then Yi = 1 else Yi = 0) so something like (mi – Mi) < 100 yi</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Each domain-specific solver can do whatever it wants, so it’s not clear to me what the value of choosing a modeling language actually is—unless we want to build a library of common
functionality that makes the construction of domain-specific engine (wrappers) easier. I’d prefer to spend our energy understanding whether the proposed workflow/interface works for a couple of different domain-specific policy engines OR to flush this one
out and build it.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US"> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Step 6: This is completely internal to the VM-placement engine (and we could say this is “transparent” to Congress)</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">We should allow configuration of a solver (this itself could be a policy
</span><span lang="EN-US" style="font-size:10.0pt;font-family:Wingdings">J</span><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> )</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">How to invoke the solver API ? </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">The domain-specific placement engine could send out to DSE (action_handler: data)?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">I had always envisioned the solver being just a library of code—not an entity that sits on the DSE itself. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">3) Step 7 : Perform the migrations (according to the assignments computed in the step 6)</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> This part invokes OpenStack API (to perform migrations).</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> We may suppose that there are services implementing “action handlers”?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> It can listen on the DSE and execute the action.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">That interface is supposed to exist by the Kilo release. I’ll check up on the progress.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">5)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Nova tables to use</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Policy
</span><span lang="EN-US" style="font-family:"Courier New"">warning(id) :-</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> nova:host(id, name, service, zone, memory_capacity),</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> legacy:special_zone(zone),</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> ceilometer:statistics(id, "memory", avg, count, duration,</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> durstart, durend, max, min, period,</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New"">perstart, perend, sum, unit),</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-family:"Courier New""> avg > 0.75 * memory_capacity</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">I believe that ceilometer gives usage of VMs and not hosts. The host table (ComputeNode table) should give current used capacity.
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Good to know. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">6)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">One of the issues highlighted in OpenStack (scheduler) and also elsewhere (e.g. Omega scheduler by google) is :</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Reading “host utilization” state from the data bases and DB (nova:host table) updates and overhead of maintaining in-memory state uptodate.</span><span lang="FR"><o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">This is expensive and current nova-scheduler does face this issue (many blogs/discussions).</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> While the first goal is a PoC, this will likely become a concern in terms of adoption.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">So you’re saying we won’t have fresh enough data to make policy decisions? If the data changes so frequently that we can’t get an accurate view, then I’m guessing we shouldn’t be migrating
based on that data anyway.</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Could you point me to some of these discussions?</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<![if !supportLists]><span lang="FR"><span style="mso-list:Ignore">7)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">While in this document you have changed the “example” policy, could we drill down the set of policies for the PoC (the server under utilization ?)</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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</span></span></span><![endif]><span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">As a reference
</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Sure. The only reason I chose this policy was because it doesn’t have aggregation. I’m guessing we’ll want to avoid aggregation for the POC because we don’t yet have it in Congress,
and it complicates the problem of translating Datalog to LP substantially. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Tim</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Ruby</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="EN-US" style="font-size:10.0pt;font-family:"Arial","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">De :</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Yathiraj Udupi (</span><span lang="FR" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">yudupi)
[<a href="mailto:yudupi@cisco.com">mailto:yudupi@cisco.com</a>] <br>
<b>Envoyé :</b> mardi 24 février 2015 20:01<br>
<b>À :</b> OpenStack Development Mailing List (not for usage questions); Tim Hinrichs<br>
<b>Cc :</b> Debo Dutta (dedutta)<br>
<b>Objet :</b> Re: [openstack-dev] [Congress][Delegation] Initial workflow design</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR"> <o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Hi Tim, </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Thanks for your updated doc on Delegation from Congress to a domain-specific policy engine, in this case, you are planning to build a LP-based VM-Placement engine to be the domain specific
policy engine. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">I agree your main goal is to first get the delegation interface sorted out. It will be good so that external services (like Solver-Scheduler) can also easily integrate to the delegation
model. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">From the Solver-Scheduler point of view, we would actually want to start working on a PoC effort to start integrating Congress and the Solver-Scheduler. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">We believe rather than pushing this effort to a long-term, it would add value to both the Solver Scheduler effort, as well as the Congress effort to try some early integration now,
as most of the LP solver work for VM placements is ready available now in Solver scheduler, and we need to spend some time thinking about translating your domain-agnostic policy to constraints that the Solver scheduler can use. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">I would definitely need your help from the Congress interfaces and I hope you will share your early interfaces for the delegation, so I can start the effort from the Solver scheduler
side for integration. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">I will reach out to you to get some initial help for integration w.r.t. Congress, and also keep you posted about the progress from our side. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Thanks,</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">Yathi. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif"">On 2/23/15, 11:28 AM, "Tim Hinrichs" <<a href="mailto:thinrichs@vmware.com">thinrichs@vmware.com</a>> wrote:</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:10.5pt;font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif"">Hi all,</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif"">I made a heavy editing pass of the Delegation google doc, incorporating many of your comments and my latest investigations into VM-placement. I left the old stuff in place at the end of the doc and
put the new stuff at the top. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif"">My goal was to propose an end-to-end workflow for a PoC that we could put together quickly to help us explore the delegation interface. We should iterate on this design until we have something that
we think is workable. And by all means pipe up if you think we need a totally different starting point to begin the iteration. </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif"">(BTW I'm thinking of the integration with solver-scheduler as a long-term solution to VM-placement, once we get the delegation interface sorted out.)</span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span lang="FR" style="font-family:"Calibri","sans-serif""><a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__docs.google.com_document_d_1ksDilJYXV-2D5AXWON8PLMedDKr9NpS8VbT0jIy-5FMIEtI_edit&d=AwMFAw&c=Sqcl0Ez6M0X8aeM67LKIiDJAXVeAw-YihVMNtXt-uEs&r=B6BWd4kFfgOzAREgThxkmTZKy7dDXE2-eBAmL0PBK7s&m=kF8jMOpogOhk8MJWvNMKJC3PiNImxWpZeD2o642YM2s&s=8PV5EW-kz8Q9aP9riFbIjJXJNZXchx2NsL-Z3Y7E5Vg&e=">https://docs.google.com/document/d/1ksDilJYXV-5AXWON8PLMedDKr9NpS8VbT0jIy_MIEtI/edit#</a></span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif""> </span><span lang="FR"><o:p></o:p></span></p>
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<span lang="FR" style="font-family:"Calibri","sans-serif"">Tim</span><span lang="FR"><o:p></o:p></span></p>
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<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">_________________________________________________________________________________________________________________________<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR"> <o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR"> <o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">This message and its attachments may contain confidential or privileged information that may be protected by law;<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">they should not be distributed, used or copied without authorisation.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">If you have received this email in error, please notify the sender and delete this message and its attachments.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:42.75pt;margin-bottom:.0001pt"><span lang="FR">As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:5.0pt;margin-left:42.75pt"><span lang="FR">Thank you.<o:p></o:p></span></pre>
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<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">_________________________________________________________________________________________________________________________<o:p></o:p></span></pre>
<pre><span lang="FR"><o:p> </o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang="FR"><o:p> </o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">This message and its attachments may contain confidential or privileged information that may be protected by law;<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">they should not be distributed, used or copied without authorisation.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">If you have received this email in error, please notify the sender and delete this message and its attachments.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.<o:p></o:p></span></pre>
<pre style="mso-margin-top-alt:0cm;margin-right:36.0pt;margin-bottom:0cm;margin-left:39.0pt;margin-bottom:.0001pt"><span lang="FR">Thank you.<o:p></o:p></span></pre>
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