[Bugs] [Bug 1176008] Directories not visible anymore after add-brick, new brick dirs not part of old bricks

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1176008



--- Comment #16 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9302 committed in master by Raghavendra G
(rgowdapp at redhat.com) 
------
commit 571a71f0acd0ec59340b9d0d2519793e33a1dc16
Author: Raghavendra G <rgowdapp at redhat.com>
Date:   Wed Feb 18 12:15:55 2015 +0530

    cluster/dht: synchronize with other concurrent healers while healing
layout.

    Current layout heal code assumes layout setting is idempotent. This
    allowed multiple concurrent healers to set the layout without any
    synchronization. However, this is not the case as different healers
    can come up with different layout for same directory and making layout
    setting non-idempotent. So, we bring in synchronization among healers
    to
       1. Not to overwrite an ondisk well-formed layout.
       2. Refresh the in-memory layout with the ondisk layout if in-memory
       layout needs healing and ondisk layout is well formed.

    This patch can synchronize
       1. among multiple healers.
       2. among multiple fix-layouts (which extends layout to consider
       added or removed brick)
       3. (but) not between healers and fix-layouts. So, the problem of
       in-memory stale layouts (not matching with layout ondisk), is not
       _completely_ fixed by this patch.

    Signed-off-by: Raghavendra G <rgowdapp at redhat.com>
    Change-Id: Ia285f25e8d043bb3175c61468d0d11090acee539
    BUG: 1176008
    Reviewed-on: http://review.gluster.org/9302
    Reviewed-by: N Balachandran <nbalacha at redhat.com>

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