[Bugs] [Bug 1411625] New: Spurious split-brain error messages are seen in rebalance logs

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1411625

            Bug ID: 1411625
           Summary: Spurious split-brain error messages are seen in
                    rebalance logs
           Product: GlusterFS
           Version: mainline
         Component: replicate
          Severity: medium
          Assignee: bugs at gluster.org
          Reporter: kdhananj at redhat.com
                CC: bugs at gluster.org, kdhananj at redhat.com,
                    nchilaka at redhat.com, rhs-bugs at redhat.com,
                    storage-qa-internal at redhat.com, tdesala at redhat.com
        Depends On: 1411617



+++ This bug was initially created as a clone of Bug #1411617 +++

Description of problem:
=======================
On a nfs-ganesha setup, while rm -rf and remove-brick operation are
in-progress, we are seeing spurious split-brain observed error messages in
rebalance logs.

Rebalance logs error snippet:
=============================
[2017-01-09 06:50:36.232738] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-6: Failing
GETXATTR on gfid 5ab6a290-3127-4662-86e7-c52d32949c67: split-brain observed.
[Input/output error]
[2017-01-09 06:50:36.244473] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-6: Failing
STAT on gfid 5ab6a290-3127-4662-86e7-c52d32949c67: split-brain observed.
[Input/output error]
[2017-01-09 06:50:38.930970] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-8: Failing
GETXATTR on gfid 000feb2a-2a8f-40f1-ae9e-926f0d0ae323: split-brain observed.
[Input/output error]
[2017-01-09 06:50:38.944043] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-8: Failing
STAT on gfid 000feb2a-2a8f-40f1-ae9e-926f0d0ae323: split-brain observed.
[Input/output error]
[2017-01-09 06:50:43.595767] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-8: Failing
GETXATTR on gfid a6f9d15e-969b-4630-867d-d7a402f242b2: split-brain observed.
[Input/output error]
[2017-01-09 06:50:43.611669] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-8: Failing
STAT on gfid a6f9d15e-969b-4630-867d-d7a402f242b2: split-brain observed.
[Input/output error]
[2017-01-09 06:50:46.798033] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-6: Failing
GETXATTR on gfid b0a4fef7-bd4c-472f-9027-eb6aef268e29: split-brain observed.
[Input/output error]
[2017-01-09 06:50:46.810447] E [MSGID: 108008]
[afr-read-txn.c:80:afr_read_txn_refresh_done] 0-distrep-replicate-6: Failing
STAT on gfid b0a4fef7-bd4c-472f-9027-eb6aef268e29: split-brain observed.
[Input/output error]


Version-Release number of selected component (if applicable):
3.8.4-10.el7rhgs.x86_64

Steps to Reproduce:
===================
1) Create ganesha cluster and create a distributed-replicate volume.
2) Enable nfs-ganesha on the volume with mdcache settings.
3) Mount the volume.
4) Create files and folders.
5) From mount point, issue rm -rf * and start removing bricks.

We can see split-brain error messages in rebalance logs.

Actual results:
===============
During rebalance, spurious split-brain error messages are seen in rebalance
logs.

Expected results:
=================
There should not be any split-brain error messages as actually no split-brain
has occurred.


Referenced Bugs:

https://bugzilla.redhat.com/show_bug.cgi?id=1411617
[Bug 1411617] Spurious split-brain error messages are seen in rebalance
logs
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