[Bugs] [Bug 1420982] Automatic split brain resolution must check for all the bricks to be up to avoiding serving of inconsistent data (visible on x3 or more)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1420982



--- Comment #2 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/16587 committed in release-3.10 by
Shyamsundar Ranganathan (srangana at redhat.com) 
------
commit 8de5213db8771088ae214d42bcae056e409d7b6a
Author: Ravishankar N <ravishankar at redhat.com>
Date:   Mon Jan 30 09:54:16 2017 +0530

    afr: all children of AFR must be up to resolve s-brain

    Problem:
    The various split-brain resolution policies (favorite-child-policy based,
    CLI based and mount (get/setfattr) based) attempt to resolve split-brain
    even when not all bricks of replica are up. This can be a problem when
    say in a replica 3, the only good copy is down and the other 2 bricks
    are up and blame each other (i.e. split-brain). We end up healing the
    file in such a  case and allow I/O on it.

    Fix:
    A decision on whether the file is in split-brain or not must be taken
    only if we are able to examine the afr xattrs of *all* bricks of a given
    replica.

    Signed-off-by: Ravishankar N <ravishankar at redhat.com>
    > Reviewed-on: https://review.gluster.org/16476
    > Smoke: Gluster Build System <jenkins at build.gluster.org>
    > NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    > CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    > Reviewed-by: Pranith Kumar Karampuri <pkarampu at redhat.com>

    (cherry picked from commit 0e03336a9362e5717e561f76b0c543e5a197b31b)
    Change-Id: Icddb1268b380005799990f5379ef957d84639ef9
    BUG: 1420982
    Reviewed-on: https://review.gluster.org/16587
    Tested-by: Ravishankar N <ravishankar at redhat.com>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Shyamsundar Ranganathan <srangana at redhat.com>

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