[Bugs] [Bug 1760792] New: afr: support split-brain CLI for replica 3

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1760792

            Bug ID: 1760792
           Summary: afr: support split-brain CLI for replica 3
           Product: GlusterFS
           Version: 6
            Status: NEW
         Component: replicate
          Keywords: Triaged
          Assignee: bugs at gluster.org
          Reporter: ravishankar at redhat.com
                CC: bugs at gluster.org
        Depends On: 1756938
            Blocks: 1759875, 1760791
  Target Milestone: ---
    Classification: Community



+++ This bug was initially created as a clone of Bug #1756938 +++

Description of problem:

Ever since we added quorum checks for lookups in afr via commit
bd44d59741bb8c0f5d7a62c5b1094179dd0ce8a4, the split-brain resolution
commands would not work for replica 3 because there would be no
readables for the lookup fop.

The argument was that split-brains do not occur in replica 3 but we do
see (data/metadata) split-brain cases once in a while which indicate that 
there are   a few bugs/corner cases yet to be discovered and fixed.

Fortunately, commit  8016d51a3bbd410b0b927ed66be50a09574b7982 added
GF_CLIENT_PID_GLFS_HEALD as the pid for all fops made by glfsheal. If we
leverage this and allow lookups when pid is GF_CLIENT_PID_GLFS_HEALD,
split-brain resolution commands will work for replica 3 volumes too.

Attempting a patch which does this.

--- Additional comment from Worker Ant on 2019-09-30 09:15:59 UTC ---

REVIEW: https://review.gluster.org/23502 (afr: support split-brain CLI for
replica 3) posted (#1) for review on master by Ravishankar N

--- Additional comment from Worker Ant on 2019-10-09 06:36:39 UTC ---

REVIEW: https://review.gluster.org/23502 (afr: support split-brain CLI for
replica 3) merged (#5) on master by Krutika Dhananjay


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1756938
[Bug 1756938] afr: support split-brain CLI for replica 3
https://bugzilla.redhat.com/show_bug.cgi?id=1759875
[Bug 1759875] afr: support split-brain CLI for replica 3
https://bugzilla.redhat.com/show_bug.cgi?id=1760791
[Bug 1760791] afr: support split-brain CLI for replica 3
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