[Bugs] [Bug 1211863] RFE: Support in md-cache to use upcall notifications to invalidate its cache

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1211863



--- Comment #56 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/12951 committed in master by Raghavendra G
(rgowdapp at redhat.com) 
------
commit 1f97d7101b3313ce647638310e1028da8dac6785
Author: Poornima G <pgurusid at redhat.com>
Date:   Fri Dec 11 05:12:07 2015 -0500

    md-cache: Add cache invalidation support to invalidate the meta data cache

    Problem:
    md-cache currently updates its stat in cbks of selected fops.
    The default cache time is 1 second, if this is increasd to reap the
    benefits of caching, we may end up with stale cache for long time,
    as there is no logic yet to notify md-cache of backend changes by
    another client.

    Solution:
    Use the existing upcall mechanism to invalidate the cache.
    For this feature to work, "features.cache-invalidation" volume
    option should be enabled.

    This patch as is doesn't improve any performance, the benifit of the
    patch is that it provides coherency for stat cache, hence the cache
    timeout can be quite longer which in turn can improve the performance.

    Change-Id: I2dbb0afa7b5e4a5a248f910188e0918e02f18692
    BUG: 1211863
    Signed-off-by: Poornima G <pgurusid at redhat.com>
    Reviewed-on: http://review.gluster.org/12951
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>

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