[Bugs] [Bug 1670719] New: md-cache should be loaded at a position in graph where it sees stats in write cbk

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1670719

            Bug ID: 1670719
           Summary: md-cache should be loaded at a position in graph where
                    it sees stats in write cbk
           Product: Red Hat Gluster Storage
           Version: 3.4
            Status: NEW
         Component: glusterd
          Assignee: amukherj at redhat.com
          Reporter: rgowdapp at redhat.com
        QA Contact: bmekala at redhat.com
                CC: bugs at gluster.org, rhs-bugs at redhat.com,
                    sankarshan at redhat.com, storage-qa-internal at redhat.com,
                    vbellur at redhat.com
        Depends On: 1670718
  Target Milestone: ---
    Classification: Red Hat



+++ This bug was initially created as a clone of Bug #1670718 +++

Description of problem:
The current xlator graph has write-behind as a child of md-cache. When writes
are cached, write-behind returns NULL values for stats. So, a write heavy
workload essentially removes stats from cache always rendering md-cache
useless.

If we load md-cache as a child of write-behind, write cbk will have stats from
bricks and hence cache will be updated with latest stat in write workloads.

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1.
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Actual results:


Expected results:


Additional info:

--- Additional comment from Worker Ant on 2019-01-30 09:05:17 UTC ---

REVIEW: https://review.gluster.org/22124 (performance/md-cache: load as a child
of write-behind) posted (#1) for review on master by Raghavendra G


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1670718
[Bug 1670718] md-cache should be loaded at a position in graph where it sees
stats in write cbk
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