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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Yujun,<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">I see the confusion.<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 way we find the resource entity (it’s different than finding the alarm entity, but it’s ok because the static datasource is defining relationships between
resource entities) is in the following way:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Each entity has a vitrage_id which is defined by “RESOURCE:<entity_type>:<entity_id> (we are planning in the very near future to change the vitrage_id to be
a UUID, but at the moment your change doesn’t need to refer to that), for example: “RESOURCE:nova.host:12345678”.<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">So in this way all you need to know about the other entity is it’s <entity_type> and it’s <entity_id>.<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">BR,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alexey<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""> Yujun Zhang [mailto:zhangyujun+zte@gmail.com]
<br>
<b>Sent:</b> Thursday, December 01, 2016 4:16 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> [ALU] Re: [openstack-dev] [ALU] [vitrage] datasource driver returnsentities only?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Another question, how do we describe an entity from <b>another</b> datasource in static datasource config?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">In the test resources of static_physical datasource, it seems to be referred as following. Does it means that it will be `nova.host` to find the matched resource? If so, how will `nova.host` identify the resource, by name or by id?<o:p></o:p></p>
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<pre style="background:#2B2B2B"><b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#CC7832">relationships:<br> </span></b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#A9B7C6">- </span><b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#CC7832">type: </span></b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#A9B7C6">nova.host<br> </span><b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#CC7832">name: </span></b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#A9B7C6">host-2<br> </span><b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#CC7832">id: </span></b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#A9B7C6">2<br> </span><b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#CC7832">relation_type: </span></b><span style="font-size:9.0pt;font-family:"menlo","serif";color:#A9B7C6">attached<o:p></o:p></span></pre>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Dec 1, 2016 at 9:50 PM Weyl, Alexey (Nokia - IL) <<a href="mailto:alexey.weyl@nokia.com">alexey.weyl@nokia.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Yujun,</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Get_all does returns a list of entities to be sent.</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Each event that is sent from the driver to the processor contains also all
the details of the neighbors that it connects to.</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">For example, the event and data that we receive from nova about an instance
also contains the host (compute) that it sits on, and that is how we decide to connect it to the correct host.</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I think it is ok that the event of static (from driver to the processor) will
contain for each entity it neighbors that it is supposed to be connected to.</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">BR,</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Alexey</span></span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"> </span></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span class="gmailmsg"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b></span><span class="gmailmsg"><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
Yujun Zhang [mailto:<a href="mailto:zhangyujun%2Bzte@gmail.com" target="_blank">zhangyujun+zte@gmail.com</a>]
</span></span><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""><br>
<span class="gmailmsg"><b>Sent:</b> Thursday, December 01, 2016 3:20 PM</span><br>
<span class="gmailmsg"><b>To:</b> OpenStack Development Mailing List (not for usage questions)</span><br>
<span class="gmailmsg"><b>Subject:</b> [ALU] [openstack-dev] [vitrage] datasource driver returns entities only?</span></span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">During the implementation of static datasource driver[1], I got a question on the return format of `get_all` method.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If I understand correctly, it should return a list of entities to be sent to the queue. Does it infer that the relationship should be embedded in entity, just like the legacy static_physical
datasource?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Suppose a link between two switches are created, how should we emit this change in `get_all` or `get_changes`?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Currently I made a compromise by emitting the relationship as an update of the connected entity. This is not very elegant and it seems we are going back to the legacy static_physical
datasource.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">[1] <a href="https://review.openstack.org/#/c/405354/" target="_blank">https://review.openstack.org/#/c/405354/</a> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">--<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Yujun<o:p></o:p></p>
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