[Bugs] [Bug 1687672] New: [geo-rep]: Checksum mismatch when 2x2 vols are converted to arbiter

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1687672

            Bug ID: 1687672
           Summary: [geo-rep]: Checksum mismatch when 2x2 vols are
                    converted to arbiter
           Product: GlusterFS
           Version: 6
            Status: ASSIGNED
         Component: geo-replication
          Keywords: ZStream
          Severity: high
          Assignee: ksubrahm at redhat.com
          Reporter: ksubrahm at redhat.com
                CC: avishwan at redhat.com, bugs at gluster.org,
                    csaba at redhat.com, khiremat at redhat.com,
                    ksubrahm at redhat.com, nchilaka at redhat.com,
                    pkarampu at redhat.com, rallan at redhat.com,
                    ravishankar at redhat.com, rhinduja at redhat.com,
                    rhs-bugs at redhat.com, sankarshan at redhat.com,
                    storage-qa-internal at redhat.com, sunkumar at redhat.com
        Depends On: 1686568
  Target Milestone: ---
    Classification: Community



Description of problem:
=======================
While converting 2x2 to 2x(2+1) (arbiter), there was a checksum mismatch:

[root at dhcp43-143 ~]# ./arequal-checksum -p /mnt/master/

Entry counts
Regular files   : 10000
Directories     : 2011
Symbolic links  : 11900
Other           : 0
Total           : 23911

Metadata checksums
Regular files   : 5ce564791c
Directories     : 288ecb21ce24
Symbolic links  : 3e9
Other           : 3e9

Checksums
Regular files   : 8e69e8576625d36f9ee1866c92bfb6a3
Directories     : 4a596e7e1e792061
Symbolic links  : 756e690d61497f6a
Other           : 0
Total           : 2fbf69488baa3ac7


[root at dhcp43-143 ~]# ./arequal-checksum -p /mnt/slave/

Entry counts
Regular files   : 10000
Directories     : 2011
Symbolic links  : 11900
Other           : 0
Total           : 23911

Metadata checksums
Regular files   : 5ce564791c
Directories     : 288ecb21ce24
Symbolic links  : 3e9
Other           : 3e9

Checksums
Regular files   : 53c64bd1144f6d9855f0af3edb55e614
Directories     : 4a596e7e1e792061
Symbolic links  : 756e690d61497f6a
Other           : 0
Total           : 3901e39cb02ad487



Everything matches except under "CHECKSUMS", Regular files and the total are a
mismatch. 



Version-Release number of selected component (if applicable):
==============================================================
glusterfs-3.12.2-45.el7rhgs.x86_64

How reproducible:
=================
2/2

Steps to Reproduce:
====================
1. Create and start a geo-rep session with master and slave being 2x2
2. Mount the vols and start pumping data
3. Disable and stop self healing (prior to add-brick)

# gluster volume set VOLNAME cluster.data-self-heal off
# gluster volume set VOLNAME cluster.metadata-self-heal off
# gluster volume set VOLNAME cluster.entry-self-heal off
# gluster volume set VOLNAME self-heal-daemon off

4. Add brick to the master and slave to convert them to 2x(2+1) arbiter vols
5. Start rebalance on master and slave

6. Re-enable self healing :

# gluster volume set VOLNAME cluster.data-self-heal on
# gluster volume set VOLNAME cluster.metadata-self-heal on
# gluster volume set VOLNAME cluster.entry-self-heal on
# gluster volume set VOLNAME self-heal-daemon on

7. Wait for rebalance to complete
8. Check the checksum between master and slave


Actual results:
===============
Checksum does not fully match


Expected results:
================
Checksum should match


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1686568
[Bug 1686568] [geo-rep]: Checksum mismatch when 2x2 vols are converted to
arbiter
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