[Bugs] [Bug 1332839] values for Number of Scrubbed files, Number of Unsigned files, Last completed scrub time and Duration of last scrub are shown as zeros in bit rot scrub status

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1332839



--- Comment #5 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/14201 committed in release-3.8 by Venky
Shankar (vshankar at redhat.com) 
------
commit e63049cba0f2b94b0b082cc8bfd5921b8443ef45
Author: Kotresh HR <khiremat at redhat.com>
Date:   Fri Apr 29 17:45:31 2016 +0530

    features/bitrot: Introduce scrubber monitor thread

    The patch does following changes.

     1. Introduce scrubber monitor thread.
     2. Move scrub status related APIs to separate file
        and make part of libbitrot library.

    Problem:
         Earlier, each child of the scrubber was maintaining
    the state machine and hence there was no way to track
    the start and end time of scrubbing as each brick has
    it's own start and end time. Also each brick was maintaining
    it's own timer wheel instance. It was also not possible
    to get scrubbed files count per session as we could not
    get last child which finishes scrubbing to reset it to
    zero.

    Solution:
        Introduce scrubber monitor thread. It does following.

     1. Maintains the scrubber state machine. Earlier each
        child had it's own state machine. Now, only monitor
        maintains on behalf of all it's children.
     2. Maintains the timer wheel instance. Earlier each
        child had it's own timer wheel instance. Now, only
        monitor maintains on behalf of all it's children.

    As a result, we can track the scrub statistics easily
    and correctly.

    Upstream master:
    http://review.gluster.org/14044
    http://review.gluster.org/#/c/14146

    Upstream 3.7:
    http://review.gluster.org/14140

    NOTE: The patch #14146 is a compilation warning not detected
    in master branch and detected only in 3.7 branch. Since the
    compilation warning is introduced by patch #14044, the above
    two backports are made into this single patch in 3.7 and the
    same is backported to 3.8.

    BUG: 1332839
    Change-Id: I1cec0b229c851fec793a1288c23e43bcec755cba
    Signed-off-by: Kotresh HR <khiremat at redhat.com>
    Reviewed-on: http://review.gluster.org/14201
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Venky Shankar <vshankar at redhat.com>

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