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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Thanks for your detail explanation.<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 agree with you that we still use DB upgrade when fresh installation.<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">Yes. It happened to me that unused vendor DB upgrade failure causes neutron DB upgrade failure.<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 have little concerns about adding whole DB upgrade in one directory alembic_migrations/versions.<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">It is difficult for devops to debug/workaround the issue.<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 suggest to separate according to components or enforce file name as <Revision>_<component>_<desctiption>.py.<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">If I don’t use the component and DB for that component upgrade fails, I can safely delete *<b><component></b>*.<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">-Ruijing<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"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></a></p>
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Salvatore Orlando [mailto:sorlando@nicira.com]
<br>
<b>Sent:</b> Tuesday, April 21, 2015 9:04 PM<br>
<b>To:</b> OpenStack Development Mailing List (not for usage questions)<br>
<b>Subject:</b> Re: [openstack-dev] [neutron] neutron DB upgrade<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 21 April 2015 at 14:25, Guo, Ruijing <<a href="mailto:ruijing.guo@intel.com" target="_blank">ruijing.guo@intel.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Somebody can help me to understand why neutron DB is needed upgrade even in refresh installation unlike other components.<br>
<br>
From my understanding, DB upgrade is risky and needed when upgrade.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Alembic is a fairly reliable tool for managing DB upgrades.<o:p></o:p></p>
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<p class="MsoNormal">Also there are enough tests in place to ensure the sanity of each "db migration" and that the DB schema is always in sync with business logic's data model.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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Release A should have schema A and Release B should have schema B.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This will make really difficult doing testing during the development cycle. While all interim migrations added during the release cycle can be squashed into a single migration provided at release time, this action will probably transform
a relatively safe process into a risky one, as there will be little time to react to issues introduced by that single migration.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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Only upgrade A to B need to upgrade DB.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">This is what happens for most users. However there still are a few which more or less closely follow trunk - that is to say they're not tied to any specific release.<o:p></o:p></p>
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<p class="MsoNormal">Also, this does not apply to developers and CI (which is ultimately one of the principal tools we use to ensure what we deliver is not completely rubbish).<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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In the same time, can we separate neutron DB as vendor DB & non-vendor DB?<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 had vendor or plugin specific migrations until Juno. When he had these kind of conditional migrations doing DB upgrades was very risky. DB schema management has become a lot simpler and safer since we unified the schema.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">However, as a part of the vendor plugin split out there will be eventually a next step where all vendor-specific tables are moved into their own dbs.<o:p></o:p></p>
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<p class="MsoNormal">Are tables for plugins which are not ML2 causing you any problem?<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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1. For that case, we can upgrade vendor DB if we use some vendor scenario.<br>
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2. we already separate vendor code from neutron code base.<br>
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Thanks,<br>
-Ruijing<br>
<br>
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