<div dir="ltr">I had set resource utilization to 1. Even then it scheduled 2 resources. Doesn't it honor utilization resources if it doesn't find a free node?<div><br></div><div>-Nikhil</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 24, 2016 at 4:43 PM, Vladislav Bogdanov <span dir="ltr"><<a href="mailto:bubble@hoster-ok.com" target="_blank">bubble@hoster-ok.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">24.10.2016 14:04, Nikhil Utane wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
That is what happened here :(.<br>
When 2 nodes went down, two resources got scheduled on single node.<br>
Isn't there any way to stop this from happening. Colocation constraint<br>
is not helping.<br>
</blockquote>
<br></span>
If it is ok to have some instances not running in such outage cases, you can limit them to 1-per-node with utilization attributes (as was suggested earlier). Then, when nodes return, resource instances will return with (and on!) them.<br>
<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
<br>
-Regards<br>
Nikhil<br>
<br>
On Sat, Oct 22, 2016 at 12:57 AM, Vladislav Bogdanov<br></span><span class="">
<<a href="mailto:bubble@hoster-ok.com" target="_blank">bubble@hoster-ok.com</a> <mailto:<a href="mailto:bubble@hoster-ok.com" target="_blank">bubble@hoster-ok.com</a>>> wrote:<br>
<br>
21.10.2016 19:34, Andrei Borzenkov wrote:<br>
<br>
14.10.2016 10:39, Vladislav Bogdanov пишет:<br>
<br>
<br>
use of utilization (balanced strategy) has one caveat:<br>
resources are<br>
not moved just because of utilization of one node is less,<br>
when nodes<br>
have the same allocation score for the resource. So, after the<br>
simultaneus outage of two nodes in a 5-node cluster, it may<br>
appear<br>
that one node runs two resources and two recovered nodes run<br>
nothing.<br>
<br>
<br>
I call this a feature. Every resource move potentially means service<br>
outage, so it should not happen without explicit action.<br>
<br>
<br>
In a case I describe that moves could be easily prevented by using<br>
stickiness (it increases allocation score on a current node).<br>
The issue is that it is impossible to "re-balance" resources in<br>
time-frames when stickiness is zero (over-night maintenance window).<br>
<br>
<br>
<br>
Original 'utilization' strategy only limits resource<br>
placement, it is<br>
not considered when choosing a node for a resource.<br>
<br>
<br>
<br>
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