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Ironic has implemented similar rolling upgrade procedure to Nova in https://review.openstack.org/#/c/408556/. Now we need to run one more command on upgrades, starting with Ocata->Pike (!): ironic-dbsync online_data_migrations Otherwise the next upgrade (Pike->Queens, for example will fail). We need updating both undercloud and overcloud bits to run it.
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHEA-2017:3462