[Bugs] [Bug 1170075] [RFE] : BitRot detection in glusterfs

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1170075



--- Comment #178 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9914 committed in master by Vijay Bellur
(vbellur at redhat.com) 
------
commit 866c64ba5e29a90b37fa051061a58300ae129a2c
Author: Venky Shankar <vshankar at redhat.com>
Date:   Fri Mar 13 21:23:20 2015 +0530

    features/bit-rot: filesystem scrubber

    Scrubber performs signature verification for objects that were
    signed by signer. This is done by recalculating the signature
    (using the hash algorithm the object was signed with) and
    verifying it aginst the objects persisted signature. Since the
    object could be undergoing IO opretaion at the time of hash
    calculation, the signature may not match objects persisted
    signature. Bitrot stub provides additional information about
    the stalesness of an objects signature (determinted by it's
    versioning mechanism). This additional bit of information is
    used by scrubber to determine the staleness of the signature,
    and in such cases the object is skipped verification (although
    signature staleness is performed twice: once before initiation
    of hash calculation and another after it (an object could be
    modified after staleness checks).

    The implmentation is a part of the bitrot xlator (signer) which
    acts as a signer or scrubber based on a translator option. As
    of now the scrub process is ever running (but has some form of
    weak throttling mechanism during filesystem scan). Going forward,
    there needs to be some form of scrub scheduling and IO throttling
    (during hash calculation) tunables (via CLI).

    Change-Id: I665ce90208f6074b98c5a1dd841ce776627cc6f9
    BUG: 1170075
    Original-Author: Raghavendra Bhat <rabhat at redhat.com>
    Original-Author: Venky Shankar <vshankar at redhat.com>
    Signed-off-by: Venky Shankar <vshankar at redhat.com>
    Reviewed-on: http://review.gluster.org/9914
    Tested-by: Vijay Bellur <vbellur at redhat.com>
    Reviewed-by: Vijay Bellur <vbellur at redhat.com>

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