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Steve,
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<div>On Feb 9, 2015, at 9:54 AM, Steven Dake (stdake) <<a href="mailto:stdake@cisco.com">stdake@cisco.com</a>> wrote:</div>
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<span style="font-weight:bold">From: </span>Andrew Melton <<a href="mailto:andrew.melton@RACKSPACE.COM">andrew.melton@RACKSPACE.COM</a>><br>
<span style="font-weight:bold">Reply-To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Monday, February 9, 2015 at 10:38 AM<br>
<span style="font-weight:bold">To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [Magnum] Scheduling for Magnum<br>
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<div style="direction: ltr; font-family: Tahoma; font-size: 10pt;">I think Sylvain is getting at an important point. Magnum is trying to be as agnostic as possible when it comes to selecting a backend. Because of that, I think the biggest benefit to Magnum
would be a generic scheduling interface that each pod type would implement. A pod type with a backend providing scheduling could implement a thin scheduler that simply translates the generic requests into something the backend can understand. And a pod type
requiring outside scheduling could implement something more heavy.
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<div>If we are careful to keep the heavy scheduling generic enough to be shared between backends requiring it, we could hopefully swap in an implementation using Gantt once that is ready.</div>
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<div>Great mid-cycle topic discussion topic. Can you add it to the planning etherpad?</div>
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Yes, it was listed as #5 here:</div>
<div><a href="https://etherpad.openstack.org/p/magnum-midcycle-topics">https://etherpad.openstack.org/p/magnum-midcycle-topics</a></div>
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<div>We will arrange that further up the priority list as soon as we feel that list is complete, and ready for sorting.</div>
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<div>Adrian</div>
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<div>Thanks</div>
<div>-steve</div>
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<div>--Andrew
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<div id="divRpF633922" style="direction: ltr;"><font face="Tahoma" size="2"><b>From:</b> Jay Lau [<a href="mailto:jay.lau.513@gmail.com">jay.lau.513@gmail.com</a>]<br>
<b>Sent:</b> Monday, February 09, 2015 4:36 AM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [Magnum] Scheduling for Magnum<br>
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<div>Thanks Sylvain, we did not work out the API requirement till now but I think the requirement should be similar with nova: we need select_destination to select the best target host based on filters and weights.<br>
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There are also some discussions here <a href="https://blueprints.launchpad.net/magnum/+spec/magnum-scheduler-for-docker" target="_blank">
https://blueprints.launchpad.net/magnum/+spec/magnum-scheduler-for-docker</a><br>
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Thanks!<br>
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<div class="gmail_quote">2015-02-09 16:22 GMT+08:00 Sylvain Bauza <span dir="ltr">
<<a href="mailto:sbauza@redhat.com" target="_blank">sbauza@redhat.com</a>></span>:<br>
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<div bgcolor="#FFFFFF">Hi Magnum team,<br>
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<div>Le 07/02/2015 19:24, Steven Dake (stdake) a écrit :<br>
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<span style="font-weight:bold">From: </span>Eric Windisch <<a href="mailto:eric@windisch.us" target="_blank">eric@windisch.us</a>><br>
<span style="font-weight:bold">Reply-To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Date: </span>Saturday, February 7, 2015 at 10:09 AM<br>
<span style="font-weight:bold">To: </span>"OpenStack Development Mailing List (not for usage questions)" <<a href="mailto:openstack-dev@lists.openstack.org" target="_blank">openstack-dev@lists.openstack.org</a>><br>
<span style="font-weight:bold">Subject: </span>Re: [openstack-dev] [Magnum] Scheduling for Magnum<br>
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1) Cherry pick scheduler code from Nova, which already has a working a filter scheduler design.<br>
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</span>The Gantt team explored that option by the Icehouse cycle and it failed with a lot of problems. I won't list all of those, but I'll just explain that we discovered how the Scheduler and the Nova compute manager were tighly coupled, which was meaning
that a repository fork was really difficult to do without reducing the tech debt.<br>
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That said, our concerns were far different from the Magnum team : it was about having feature parity and replacing the current Nova scheduler, while your team is just saying that they want to have something about containers.<span class=""><br>
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2) Integrate swarmd to leverage its scheduler[2].</blockquote>
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<div>I see #2 as not an alternative but possibly an "also". Swarm uses the Docker API, although they're only about 75% compatible at the moment. Ideally, the Docker backend would work with both single docker hosts and clusters of Docker machines powered by
Swarm. It would be nice, however, if scheduler hints could be passed from Magnum to Swarm.</div>
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<div>Regards,</div>
<div>Eric Windisch </div>
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<div>Adrian & Eric,</div>
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<div>I would prefer to keep things simple and just integrate directly with swarm and leave out any cherry-picking from Nova. It would be better to integrate scheduling hints into Swarm, but I’m sure the swarm upstream is busy with requests and this may be difficult
to achieve.</div>
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</span>I don't want to give my opinion about which option you should take as I don't really know your needs. If I understand correctly, this is about having a scheduler providing affinity rules for containers. Do you have a document explaining which interfaces
you're looking for, which kind of APIs you're wanting or what's missing with the current Nova scheduler ?<br>
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MHO is that the technology shouldn't drive your decision : whatever the backend is (swarmd or an inherited nova scheduler), your interfaces should be the same.
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-Sylvain<br>
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<div>-steve</div>
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<div>Thanks,<br>
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Jay Lau (Guangya Liu)<br>
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