Comment 2 for bug 1301515

Reviewed: https://review.openstack.org/84806
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=93f29574c416aebcd1bd7527d3007664aa073766
Submitter: Jenkins
Branch: master

commit 93f29574c416aebcd1bd7527d3007664aa073766
Author: John Garbutt <email address hidden>
Date: Wed Apr 2 17:37:03 2014 +0100

    Reduce logging in scheduler

    The logging in the scheduler is what takes most of the time,
    once you are doing no DB calls.

    This ensures the servicegroup is_up and retry_filter only log
    on failures, which is more in line with the other filters.

    Using the test "test_performance_check_select_destination"
    modifying it to use 200 hosts, the request time went from
    70ms to under 10ms.

    We could reduce logging further, but this minimal change makes
    a massive impact. The next steps would require a config value
    to disable all debug logging in the scheduler.

    Closes-Bug: #1301515

    Change-Id: Ia4c7e506e8df9c560c349e2ebec3f5111aa0cb0d