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Thanks Hongbin, for raising this for discussion. There is a middle ground that we can reach. We can collect a set of “best practices”, and place them together in a document. Some of them will be operational best practices for cloud operators, and some of them
will be for end users. We can make callouts to them in the quick start, so our newcomers know where to look for them, but this will help us to keep the quickstart concise. The practice of selecting a memory limit would be one of the best practices that we
can call out to.
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<div class="">Adrian<br class="">
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<div class="">On Oct 8, 2015, at 9:00 AM, Hongbin Lu <<a href="mailto:hongbin.lu@huawei.com" class="">hongbin.lu@huawei.com</a>> wrote:</div>
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<span style="color: rgb(31, 73, 125);" class="">Hi team,<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> </span></div>
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<span style="color: rgb(31, 73, 125);" class="">I want to move the discussion in the review below to here, so that we can get more feedback<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> </span></div>
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<span style="color: rgb(31, 73, 125);" class=""><a href="https://review.openstack.org/#/c/232175/" style="color: purple; text-decoration: underline;" class="">https://review.openstack.org/#/c/232175/</a><o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> </span></div>
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<span style="color: rgb(31, 73, 125);" class="">In summary, magnum currently added support for specifying the memory size of containers. The specification of the memory size is optional, and the COE won’t reserve any memory to the containers with unspecified
memory size. The debate is whether we should document this optional parameter in the quickstart guide. Below is the positions of both sides:<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> </span></div>
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<span style="color: rgb(31, 73, 125);" class="">Pros:<o:p class=""></o:p></span></div>
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<span style="font-family: Symbol; color: rgb(31, 73, 125);" class=""><span class="">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="color: rgb(31, 73, 125);" class="">It
is a good practice to always specifying the memory size, because containers with unspecified memory size won’t have QoS guarantee.<o:p class=""></o:p></span></div>
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<span style="font-family: Symbol; color: rgb(31, 73, 125);" class=""><span class="">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="color: rgb(31, 73, 125);" class="">The
in-development autoscaling feature [1] will query the memory size of each container to estimate the residual capacity and triggers scaling accordingly. Containers with unspecified memory size will be treated as taking 0 memory, which negatively affects the
scaling decision.<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class="">Cons:<o:p class=""></o:p></span></div>
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<span style="font-family: Symbol; color: rgb(31, 73, 125);" class=""><span class="">·<span style="font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-family: 'Times New Roman';" class=""> <span class="Apple-converted-space"> </span></span></span></span><span style="color: rgb(31, 73, 125);" class="">The
quickstart guide should be kept as simple as possible, so it is not a good idea to have the optional parameter in the guide.<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> </span></div>
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<span style="color: rgb(31, 73, 125);" class="">Thoughts?<o:p class=""></o:p></span></div>
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<span style="color: rgb(31, 73, 125);" class=""> </span></div>
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<span style="color: rgb(31, 73, 125);" class="">[1]<span class="Apple-converted-space"> </span><a href="https://blueprints.launchpad.net/magnum/+spec/autoscale-bay" style="color: purple; text-decoration: underline;" class="">https://blueprints.launchpad.net/magnum/+spec/autoscale-bay</a><o:p class=""></o:p></span></div>
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