[Bugs] [Bug 1218717] Files migrated should stay on a tier for a full cycle

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1218717



--- Comment #6 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/11110 committed in master by Niels de Vos
(ndevos at redhat.com) 
------
commit 46b3fde5437b293d9c0897fe167223b8f4f37c60
Author: Joseph Fernandes <josferna at redhat.com>
Date:   Sat Jun 6 10:28:51 2015 +0530

    tier/dht: Fixing non atomic promotion/demotion w.r.t to frequency period

    This fixes the ping-pong issue i.e files getting demoted immediately
    after promition, caused by off-sync promotion/demotion processes.
    The solution is do promotion/demotion refering to the system time.
    To have the fix working all the file serving nodes should have
    thier system time synchronized with each other either manually or
    using a NTP Server.

    NOTE: The ping-pong issue can re-appear even with this fix, if the admin
    have different promotion freq period and demotion freq period, but this
    would be under the control of the admin.

    Change-Id: I1b33a5881d0cac143662ddb48e5b7b653aeb1271
    BUG: 1218717
    Signed-off-by: Joseph Fernandes <josferna at redhat.com>
    Reviewed-on: http://review.gluster.org/11110
    Reviewed-by: Dan Lambright <dlambrig at redhat.com>
    Tested-by: Dan Lambright <dlambrig at redhat.com>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>

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