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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">This mail is generic to all openstack service and explained the problem with respect to heat here.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have come across the situation where, updates are involved in the heat db model and corresponding code changes in the heat-engine component. Now assume that in a given deployment, there are two heat-engines and customer wants to update
as follows:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Run db sync and update the first heat-engine and restart the heat-engine<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-.25in;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]>Don’t touch the second heat-engine.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In this scenario, first heat-engine will work properly as its updated with new db change done by the db sync. But second heat-engine is not updated and it will fail. To address this problem, would like to know if any other service came
across the same scenario and a solution is already provided? Thanks.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards<o:p></o:p></p>
<p class="MsoNormal">Kanagaraj M<o:p></o:p></p>
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