[Bugs] [Bug 1176756] glusterd: remote locking failure when multiple synctask transactions are run

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1176756



--- Comment #6 from Anand Avati <aavati at redhat.com> ---
COMMIT: http://review.gluster.org/9328 committed in release-3.6 by Raghavendra
Bhat (raghavendra at redhat.com) 
------
commit a1d9f01b28267fc333aebc49cb81ee69dc2c24f8
Author: Atin Mukherjee <amukherj at redhat.com>
Date:   Fri Dec 12 07:21:19 2014 +0530

    glusterd: Maintain  per transaction xaction_peers list in syncop & mgmt_v3

    In current implementation xaction_peers list is maintained in a global
variable
    (glustrd_priv_t) for syncop/mgmt_v3. This means consistency and atomicity
of
    peerinfo list across transactions is not guranteed when multiple
syncop/mgmt_v3
    transaction are going through.

    We had got into a problem in mgmt_v3-locks.t which was failing spuriously,
the
    reason for that was two volume set operations (in two different volume) was
    going through simultaneouly and both of these transaction were manipulating
the
    same xaction_peers structure which lead to a corrupted list. Because of
which in
    some cases unlock request to peer was never triggered and we end up with
having
    stale locks.

    Solution is to maintain a per transaction local xaction_peers list for
every
    syncop.

    Please note I've identified this problem in op-sm area as well and a
separate
    patch will be attempted to fix it.

    Finally thanks to Krishnan Parthasarathi and Kaushal M for your constant
help to
    get to the root cause.

    Backport URL : http://review.gluster.org/#/c/9269/
                   http://review.gluster.org/#/c/9422/
                   http://review.gluster.org/#/c/9350/

    Change-Id: Ib1eaac9e5c8fc319f4e7f8d2ad965bc1357a7c63
    BUG: 1176756
    Signed-off-by: Atin Mukherjee <amukherj at redhat.com>
    Reviewed-on: http://review.gluster.org/9269
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Kaushal M <kaushal at redhat.com>
    Reviewed-on: http://review.gluster.org/9328
    Reviewed-by: Raghavendra Bhat <raghavendra at redhat.com>
    Tested-by: Raghavendra Bhat <raghavendra at redhat.com>

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