[Bugs] [Bug 1473136] New: rebalance: Allow admin to change thread count for rebalance

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1473136

            Bug ID: 1473136
           Summary: rebalance: Allow admin to change thread count for
                    rebalance
           Product: GlusterFS
           Version: 3.10
         Component: distribute
          Assignee: bugs at gluster.org
          Reporter: spalai at redhat.com
                CC: bugs at gluster.org
        Depends On: 1438370



+++ This bug was initially created as a clone of Bug #1438370 +++

Description of problem:

Current rebalance throttle options: lazy/normal/aggressive may not always be
sufficient for the purpose of throttling.  In our recent test, we observed for
certain setups, normal and aggressive modes behaved similarly consuming full
disk bandwidth. So in cases like this admin can tune it down(or vice versa)
depending on the need.

--- Additional comment from Worker Ant on 2017-04-03 14:19:52 MVT ---

REVIEW: https://review.gluster.org/16980 (cluster/dht: Make rebalance throttle
option tuned by number) posted (#2) for review on master by Susant Palai
(spalai at redhat.com)

--- Additional comment from Worker Ant on 2017-04-27 14:28:38 MVT ---

REVIEW: https://review.gluster.org/16980 (cluster/dht: Make rebalance throttle
option tuned by number) posted (#3) for review on master by Susant Palai
(spalai at redhat.com)

--- Additional comment from Worker Ant on 2017-04-27 15:38:47 MVT ---

REVIEW: https://review.gluster.org/16980 (cluster/dht: Make rebalance throttle
option tuned by number) posted (#4) for review on master by Susant Palai
(spalai at redhat.com)

--- Additional comment from Worker Ant on 2017-04-27 15:43:03 MVT ---

REVIEW: https://review.gluster.org/16980 (cluster/dht: Make rebalance throttle
option tuned by number) posted (#5) for review on master by Susant Palai
(spalai at redhat.com)

--- Additional comment from Worker Ant on 2017-04-27 19:06:23 MVT ---

REVIEW: https://review.gluster.org/16980 (cluster/dht: Make rebalance throttle
option tuned by number) posted (#6) for review on master by Susant Palai
(spalai at redhat.com)

--- Additional comment from Worker Ant on 2017-04-29 19:29:38 MVT ---

COMMIT: https://review.gluster.org/16980 committed in master by Raghavendra G
(rgowdapp at redhat.com) 
------
commit d51288540241d1f7785bb17bdc0702c0879087a9
Author: Susant Palai <spalai at redhat.com>
Date:   Wed Mar 22 17:14:25 2017 +0530

    cluster/dht: Make rebalance throttle option tuned by number

    Current rebalance throttle options: lazy/normal/aggressive may not always
be
    sufficient for the purpose of throttling.  In our recent test, we observed
for
    certain setups, normal and aggressive modes behaved similarly consuming
full
    disk bandwidth. So in cases like this admin should be able to  tune it
    down(or vice versa) depending on the need.

    Along with old throttle configurations, thread counts are tuned based on
number.
    e.g. gluster v set vol-name cluster-rebal.throttle  5.

    Admin can tune up/down between 0 and the number of cores available.

    Note: For heterogenous servers, validation will fail on the old server if
"number"
    is given for throttle configuration.
    The message looks something like this:
    "volume set: failed: Staging failed on vm2. Error: cluster.rebal-throttle
should be {lazy|normal|aggressive}"

    Test: Manual test by logging active thread number after reconfiguring
throttle option.
    testcase: tests/basic/distribute/throttle-rebal.t

    Change-Id: I46e3cde546900307831028b344ecf601fd9b02c3
    BUG: 1438370
    Signed-off-by: Susant Palai <spalai at redhat.com>
    Reviewed-on: https://review.gluster.org/16980
    NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Atin Mukherjee <amukherj at redhat.com>
    Reviewed-by: Raghavendra G <rgowdapp at redhat.com>

--- Additional comment from Shyamsundar on 2017-05-30 23:48:52 MVT ---

This bug is getting closed because a release has been made available that
should address the reported issue. In case the problem is still not fixed with
glusterfs-3.11.0, please open a new bug report.

glusterfs-3.11.0 has been announced on the Gluster mailinglists [1], packages
for several distributions should become available in the near future. Keep an
eye on the Gluster Users mailinglist [2] and the update infrastructure for your
distribution.

[1] http://lists.gluster.org/pipermail/announce/2017-May/000073.html
[2] https://www.gluster.org/pipermail/gluster-users/


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1438370
[Bug 1438370] rebalance: Allow admin to change thread count for rebalance
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