[Bugs] [Bug 1313228] promotions and demotions not happening after attach tier due to fix layout taking very long time(3 days)

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1313228



--- Comment #9 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/13491 committed in master by Dan Lambright
(dlambrig at redhat.com) 
------
commit b67e569b3906d99677a1349cb82668f9088cf4eb
Author: Joseph Fernandes <josferna at redhat.com>
Date:   Tue Feb 23 12:51:45 2016 +0530

    tier/dht : Attach tier fix layout to run in background

    1. Spawn a thread for background fix-layout for tier process.

    2. Once the fix-layout is completed a marker xttr is set on the root of
       volume to mark the completion of the background fixlayout, so that
       even if the tier process is spawned again, fixlayout will not be
       issued, if it was completed last time.

    3. Please note that promotion of legacy files will happen eventually as
       the ctr lookup heal in the fixlayout slowly heals the ctr db for legacy
       files OR the ctr lookup heal happend due to a name lookup.

    4. When a detach tier is successful in evacuation data from hot tier, we
remove
       the marker xattr is removed. So that next attach tier runs the
background
       tier fixlayout.

    what is remaining ?
    1. Instead of clearing the marker xattr of tiering fix layout at the end of
detach start
       clear it during detach commit. But the issue is detach commit is a
glusterd operation
       and the volume is not mounted in glusterd.
       The reason we want to do it in detach commit is that if the admin wants
to attach the
       same tier again, then a background fixlayout will be triggered, which
would not be needed.
    2. Clearing the CTR DB of the cold bricks when there is a detach commit, as
it will be having
       entries which will be stale when the volume is used, with ctr off (ctr
is switched off only when
       we have detach commit.)

    Change-Id: Ibe343572e95865325cd0eef4d0b976b626a3c0c5
    BUG: 1313228
    Signed-off-by: Joseph Fernandes <josferna at redhat.com>
    Reviewed-on: http://review.gluster.org/13491
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    Tested-by: Joseph Fernandes
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Dan Lambright <dlambrig at redhat.com>

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