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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">As discussed previously in the ML (by Samuel Bercovici). the scheduler should be part of the device and not global as can be seen in the attached picture.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The only global logic is the selection of the appropriate Driver based on service type/capabilities.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">The device selection logic might be based on vendor specific logic which is not be relevant in a global scope.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">In addition, the appropriate registration of the different devices as well as the provisioning logic is unique to each vendor.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">As we (Radware) plan to manage the placement in the Driver, we will not be using any of the logic discussed.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Is there any reason prohibiting the scheduling logic to be used by the HA Proxy driver privately and not as a global logic?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">If other vendors want to use the device scheduler for their implementation, they can utilize this class the is also provided for the HA proxy.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Moreover, such class could be placed in a shared directory (ex: LBaaS_utility) so that anyone who wishes to use it, could get it from there.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Thanks<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Avishay<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";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""> Eugene Nikanorov [mailto:enikanorov@mirantis.com]
<br>
<b>Sent:</b> Tuesday, January 22, 2013 5:21 PM<br>
<b>To:</b> OpenStack Development Mailing List<br>
<b>Subject:</b> [openstack-dev] [Quantum][LBaaS] Scheduling & device management for LBaaS<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi folks,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I'd like to present blueprint <a href="https://blueprints.launchpad.net/quantum/+spec/quantum-service-scheduler">
https://blueprints.launchpad.net/quantum/+spec/quantum-service-scheduler</a> which I feel needs to be in grizzly.<o:p></o:p></p>
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<p class="MsoNormal">You can find more detailed description in specification page.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Initially we planned to have comprehensive device management as separate plugin with extension and complicated schedulers.<o:p></o:p></p>
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<p class="MsoNormal">However due to the lack of time and reviewer resources we desided to greatly reduce the scope of this work.<o:p></o:p></p>
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<p class="MsoNormal">So, currently the code on review ( <a href="https://review.openstack.org/#/c/20225/">
https://review.openstack.org/#/c/20225/</a> ) introduces the following:<o:p></o:p></p>
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<p class="MsoNormal">1) Configuration management for service schedulers, e.g. admin can configure particular scheduler for particular service type<o:p></o:p></p>
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<p class="MsoNormal">2) Simplistic scheduler for lbaas:<o:p></o:p></p>
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<p class="MsoNormal"> - scheduling algorithm that randomly chooses a device from list of devices<o:p></o:p></p>
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<p class="MsoNormal"> - device manager that reads devices from predefined conf-file (suggestion from Salvatore)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I believe this is reasonable minimum that will allow to use LBaaS service at least with some convenience. <o:p></o:p></p>
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<p class="MsoNormal">(In fact, I'd provide some more scheduling algorithms)<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">We have also started to integrate this code with code of <a href="https://blueprints.launchpad.net/quantum/+spec/lbaas-agent-and-rpc" title="Agent-based Loadbalancer Plugin"><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#0033AA;background:white">lbaas-agent-and-rpc</span></a> according
to the call sequence diagram:<o:p></o:p></p>
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<p class="MsoNormal"><a href="http://wiki.openstack.org/Quantum/LBaaS/Architecture/Scheduler">http://wiki.openstack.org/Quantum/LBaaS/Architecture/Scheduler</a><o:p></o:p></p>
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<p class="MsoNormal">So we plan that this code will be base patch for <a href="https://blueprints.launchpad.net/quantum/+spec/lbaas-agent-and-rpc" title="Agent-based Loadbalancer Plugin"><span style="font-size:9.0pt;font-family:"Tahoma","sans-serif";color:#0033AA;background:white">lbaas-agent-and-rpc</span></a>.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Eugene.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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