<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Tue, Aug 19, 2014 at 11:12 PM, Sergey Kraynev <span dir="ltr"><<a href="mailto:skraynev@mirantis.com" target="_blank">skraynev@mirantis.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Added tag Heat<br><div class="gmail_extra"><br clear="all"><div><div dir="ltr">Regards,<div>Sergey.</div>
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<br><br><div class="gmail_quote">On 1 August 2014 09:52, Manickam, Kanagaraj <span dir="ltr"><<a href="mailto:kanagaraj.manickam@hp.com" target="_blank">kanagaraj.manickam@hp.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">This mail is generic to all openstack service and explained the problem with respect to heat here.
<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></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:<u></u><u></u></p>
<p><u></u><span>1.<span style="font:7.0pt "Times New Roman"">
</span></span><u></u>Run db sync and update the first heat-engine and restart the heat-engine<u></u><u></u></p>
<p><u></u><span>2.<span style="font:7.0pt "Times New Roman"">
</span></span><u></u>Don’t touch the second heat-engine.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></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.<u></u><u></u></p>
<p class="MsoNormal"><u></u></p></div></div></blockquote></div></div></div></blockquote><div><br></div><div>Nova has a conductor that is the only thing talking to the actual DB (afaik) so the other daemons can use versioned rpc to talk to the conductor.<br>
<br></div><div>-Angus<br></div><div><br> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div link="#0563C1" vlink="#954F72" lang="EN-US"><div><p class="MsoNormal"> <u></u></p>
<p class="MsoNormal">Regards<u></u><u></u></p>
<p class="MsoNormal">Kanagaraj M<u></u><u></u></p>
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