[Bugs] [Bug 1428086] New: Make Halo calculate & use average latencies, not realtime

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1428086

            Bug ID: 1428086
           Summary: Make Halo calculate & use average latencies, not
                    realtime
           Product: GlusterFS
           Version: mainline
         Component: core
          Assignee: bugs at gluster.org
          Reporter: vbellur at redhat.com
                CC: bugs at gluster.org



Make Halo calculate & use average latencies, not realtime

Summary:
- Realtime latencies in practice have far too much jitter under real
  loading conditions, instead let's use a running average which will get
  very "heavy" over time such that temp spikes in brick latency will not
  affect halo decisions.

Test Plan: - Run prove tests

Reviewed By: mmckeen

Change-Id: I5ebf9bc93c67d9a226287796dd7ca5eeb7b1cfa5
Signed-off-by: Kevin Vigor <kvigor at fb.com>
Reviewed-on: http://review.gluster.org/16301
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins at build.gluster.org>
Smoke: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Shreyas Siravara <sshreyas at fb.com>

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