21.10.2016 19:34, Andrei Borzenkov wrote:
14.10.2016 10:39, Vladislav Bogdanov пишет:
use of utilization (balanced strategy) has one caveat: resources are
not moved just because of utilization of one node is less, when nodes
have the same allocation score for the resource. So, after the
simultaneus outage of two nodes in a 5-node cluster, it may appear
that one node runs two resources and two recovered nodes run
nothing.
I call this a feature. Every resource move potentially means service
outage, so it should not happen without explicit action.
In a case I describe that moves could be easily prevented by using
stickiness (it increases allocation score on a current node).
The issue is that it is impossible to "re-balance" resources in
time-frames when stickiness is zero (over-night maintenance window).
Original 'utilization' strategy only limits resource placement, it is
not considered when choosing a node for a resource.
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