[Bugs] [Bug 1670718] 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=1670718

            Bug ID: 1670718
           Summary: md-cache should be loaded at a position in graph where
                    it sees stats in write cbk
           Product: GlusterFS
           Version: mainline
            Status: NEW
         Component: glusterd
          Assignee: bugs at gluster.org
          Reporter: rgowdapp at redhat.com
                CC: bugs at gluster.org
  Target Milestone: ---
    Classification: Community



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:


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Expected results:


Additional info:

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