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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Glance Team,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I am following up on discussions in the edge-computing PTG meetings.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">There were discussions on potential enhancements to Glance API Caching for support of the proposed MVP Edge Architecture.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">And I took the action to write up a blueprint and a specification for these enhancements ... and will follow up with implementation.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I thought I’d start the discussions on the mailing list ... and if everyone is still in agreement,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">then I’ll move the high-level definition/requirements to Glance’s Launchpad (or Storyboard?) and<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">write up a Glance spec and review it in Gerrit.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><b><u><span style="font-size:11.0pt">THE PROPOSAL:<o:p></o:p></span></u></b></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Enhance Glance API Caching such that
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="font-size:11.0pt"><span style="mso-list:Ignore">a)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">It works between two Glance Services (i.e. Glance at a Central OpenStack Cloud and Glance at an Edge OpenStack Cloud)<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-.25in;mso-list:l1 level2 lfo1">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">i.e. current Glance API Caching only works with external webservers<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo1">
<![if !supportLists]><span style="font-size:11.0pt"><span style="mso-list:Ignore">b)<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">Enable the Edge Cloud Glance API Caching to support the ability to locally use those cached images (e.g. nova boot ...)<br>
even when network connectivity is lost to the Central Cloud Glance Service<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.5in;text-indent:-.25in;mso-list:l1 level2 lfo1">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">i.e. image meta-data is required in order to service a ‘nova boot ...’, and<br>
today image meta-data is NOT cached by Glance API Caching.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">The proposed solution should generically work between any two Glance Services.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">e.g.
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">in a Multi-Region Environment,
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">in a StarlingX Distributed Cloud,<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style="font-size:11.0pt;font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:11.0pt">etc.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">The proposed solution need only deal with the Edge Cloud Glance talking to a single Central Cloud Glance.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Let me know if you have any a questions or comments,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Greg.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">p.s.<o:p></o:p></span></p>
<p class="MsoNormal"><u><span style="font-size:11.0pt">Background:<o:p></o:p></span></u></p>
<p class="MsoNormal"><span style="font-size:11.0pt">More info on the edge-computing group’s MVP Edge Architecture can be found here:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <a href="https://www.dropbox.com/s/255x1cao14taer3/MVP-Architecture_edge-computing_PTG.pptx?dl=0">
https://www.dropbox.com/s/255x1cao14taer3/MVP-Architecture_edge-computing_PTG.pptx?dl=0</a>
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">and<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> <a href="https://docs.google.com/document/d/1Mq6bSm_lES56S4gygEuhmMbEeCI2nBFl_U5vl50wih8/edit?ts=5baa654e#heading=h.ncllqse6iw0u">
https://docs.google.com/document/d/1Mq6bSm_lES56S4gygEuhmMbEeCI2nBFl_U5vl50wih8/edit?ts=5baa654e#heading=h.ncllqse6iw0u</a>
<o:p></o:p></span></p>
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