[Bugs] [Bug 1306852] Tiering threads can starve each other

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1306852



--- Comment #4 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/13433 committed in master by Dan Lambright
(dlambrig at redhat.com) 
------
commit 87b19927ed41cfe47579c1c069cb6640fd47a732
Author: Dan Lambright <dlambrig at redhat.com>
Date:   Tue Feb 9 03:37:31 2016 +0000

    cluster/tier: make promotion and demotion independant

    Currently a main loop in tiering spawns promotion and demotion threads,
    and does a join to wait for them to complete. When one of the two
    threads takes a long time, the main thread waits for it
    before exiting the join. It may wait so long the scheduled time
    for the other thread is skipped. In the case of demotion, it may be
    a long time before another attempt. This patch fixes that by
    making the promotion and demotion activities independant. A side
    effect of this change is the logic is significantly simplified.

    Change-Id: I1196bd4bbfc95e8aa326a9bd4ebf395032369d1c
    BUG: 1306852
    Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    Reviewed-on: http://review.gluster.org/13433
    Smoke: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Joseph Fernandes
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.com>

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