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

[bugzilla at redhat.com]

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



--- Comment #4 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/17835 committed in release-3.10 by
Shyamsundar Ranganathan (srangana at redhat.com) 
------
commit c7101426c64db6723752c55f116dcbfbaf84a668
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>
    > Signed-off-by: Susant Palai <spalai at redhat.com>

    Change-Id: I46e3cde546900307831028b344ecf601fd9b02c3
    BUG: 1473136
    Signed-off-by: Susant Palai <spalai at redhat.com>
    Reviewed-on: https://review.gluster.org/17835
    CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
    Smoke: Gluster Build System <jenkins at build.gluster.org>
    Reviewed-by: Shyamsundar Ranganathan <srangana at redhat.com>

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