Complete replacement of overcloud nodes during a stack update on Red Hat OpenStack Platform

Solution In Progress - Updated 2016-09-26T17:11:00+00:00 -

Issue

The following blog article mentions that it's possible that overcloud nodes could be completely rebuilt during a stack update. Is this a valid concern?
http://alesnosek.com/blog/2016/03/27/tripleo-installer-the-good/

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