[Bugs] [Bug 1214289] I/O failure on attaching tier

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1214289



--- Comment #21 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/11092 committed in master by Niels de Vos
(ndevos at redhat.com) 
------
commit b1ff2294d2aaf7dd36918837c09a68152adc0637
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Thu Jun 4 14:00:34 2015 -0400

    cluster/tier: account for reordered layouts

    For a tiered volume the cold subvolume is always at a fixed
    position in the graph. DHT's layout array, on the other hand,
    may have the cold subvolume in either the first or second
    index, therefore code cannot make any assumptions. The fix
    searches the layout for the correct position dynamically
    rather than statically.

    The bug manifested itself in NFS, in which a newly attached
    subvolume had not received an existing directory. This case
    is a "stale entry" and marked as such in the layout for
    that directory.  The code did not see this, because it
    looked at the wrong index in the layout array.

    The fix also adds the check for decomissioned bricks, and
    fixes a problem in detach tier related to starting the
    rebalance process: we never received the right defrag
    command and it did not get directed to the tier translator.

    Change-Id: I77cdf9fbb0a777640c98003188565a79be9d0b56
    BUG: 1214289
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Tested-by: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Shyamsundar Ranganathan <srangana at redhat.com>
    Reviewed-by: Joseph Fernandes <josferna at redhat.com>
    Reviewed-by: Mohammed Rafi KC <rkavunga at redhat.com>
    Reviewed-on: http://review.gluster.org/11092

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