[Bugs] [Bug 1287842] Few snapshot creation fails with pre-validation failed message on tiered volume.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1287842



--- Comment #12 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/13104 committed in master by Dan Lambright
(dlambrig at redhat.com) 
------
commit eb0d9513ece40c5d4cb7f3bae13874bbfe4fcff8
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Mon Dec 28 10:57:53 2015 -0500

    cluster/tier: allow db queries to be interruptable

    A query to the database may take a long time if the database
    has many entries. The tier daemon also sends IPC calls to the
    bricks which can run slowly, espcially in RHEL6. While it is
    possible to track down each such instance, the snapshot
    feature should not be affected by database operations. It requires
    no migration be underway. Therefore it is okay to pause tiering
    at any time except when DHT is moving a file.  This fix implements
    this strategy by monitoring when control passes to DHT to
    migrate a file using the GF_XATTR_FILE_MIGRATE_KEY trigger. If it
    is not, the pause operation is successful.

    Change-Id: I21f168b1bd424077ad5f38cf82f794060a1fabf6
    BUG: 1287842
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Reviewed-on: http://review.gluster.org/13104
    Reviewed-by: Joseph Fernandes
    Tested-by: Gluster Build System <jenkins at build.gluster.com>

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