[Bugs] [Bug 1270123] Data Tiering: Database locks observed on tiered volumes on continous writes to a file

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1270123



--- Comment #2 from Vijay Bellur <vbellur at redhat.com> ---
COMMIT: http://review.gluster.org/12325 committed in release-3.7 by Dan
Lambright (dlambrig at redhat.com) 
------
commit 489f02879afd940d201d092720dbf13b2922b134
Author: Joseph Fernandes <josferna at redhat.com>
Date:   Fri Sep 18 19:57:54 2015 +0530

    tier/ctr: Solution for db locks for tier migrator and ctr using sqlite
version less than 3.7 i.e rhel 6.7

    Problem: On RHEL 6.7, we have sqlite version 3.6.2 which doesnt support
    WAL journaling mode, as this journaling mode is only available in sqlite
3.7 and above.
    As a result we cannot have to progreses concurrently accessing sqlite,
without
    running into db locks! Well WAL is also need for performace on CTR side.

    Solution: This solution is to use CTR db connection for doing queries when
WAL mode is
    absent. i,e tier migrator will send sync_op ipc calls to CTR, which in turn
will
    do the query and create/update the query file suggested by tier migrator.

    Pending: Well this solution will stop the db locks but the performance is
still an issue for CTR.
    We are developing an in-Memory Transaction Log (iMeTaL) which will help
boost the CTR
    performance by doing in memory udpates on the IO path and later flush the
updates to
    the db in a batch/segment flush.

    Master patch: http://review.gluster.org/#/c/12191
    >> Change-Id: Ie3149643ded159234b5cc6aa6cf93b9022c2f124
    >> BUG: 1240577
    >> Signed-off-by: Joseph Fernandes <josferna at redhat.com>
    >> Signed-off-by: Dan Lambright <dlambrig at redhat.com>
    >> Signed-off-by: Joseph Fernandes <josferna at redhat.com>
    >> Reviewed-on: http://review.gluster.org/12191
    >> Tested-by: Gluster Build System <jenkins at build.gluster.com>
    >> Reviewed-by: Luis Pabon <lpabon at redhat.com>
    Signed-off-by: Joseph Fernandes <josferna at redhat.com>

    Change-Id: Ie8c7a7e9566244c104531b579126bb57fbc6e32b
    BUG: 1270123
    Reviewed-on: http://review.gluster.org/12325
    Tested-by: NetBSD Build System <jenkins at build.gluster.org>
    Tested-by: Gluster Build System <jenkins at build.gluster.com>
    Reviewed-by: Dan Lambright <dlambrig at redhat.com>
    Tested-by: Dan Lambright <dlambrig at redhat.com>

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