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List:       gluster-bugs
Subject:    [Bugs] [Bug 1670718] New: md-cache should be loaded at a position in graph where it sees stats in wr
From:       bugzilla () redhat ! com
Date:       2019-01-30 9:02:05
Message-ID: bug-1670718-371520 () https ! bugzilla ! redhat ! com/
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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@gluster.org
          Reporter: rgowdapp@redhat.com
                CC: bugs@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:


Steps to Reproduce:
1.
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Actual results:


Expected results:


Additional info:

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