Comment 15 for bug 1494314

Reviewed: https://review.openstack.org/257765
Committed: https://git.openstack.org/cgit/openstack/fuel-library/commit/?id=6134af0c6ec651e4feef45acdc5a291beab405cd
Submitter: Jenkins
Branch: master

commit 6134af0c6ec651e4feef45acdc5a291beab405cd
Author: Dmitry Bilunov <email address hidden>
Date: Tue Dec 15 12:29:07 2015 +0300

    Fix detached keystone node epoch mismatch

    Pacemaker maintains an internal database, which is used for
    configuration storage. Each update of this database increases a counter,
    called "epoch", which should have the same value cluster-wide.

    If an update operation comes to a previously detached node, a conflict
    will occur. Pacemaker does not allow updating this database on a node,
    which epoch value is lower than the epoch value of a cluster leader.

    We should wait the epoch counter to come into sync by perodically
    retrying the update command.

    Closes-Bug: 1494314
    Change-Id: I1f242bcd90264ec45da2aaa6bc030f244511761b