[Gluster-devel] query about a split-brain problem found in glusterfs3.12.3

[Zhou, Cynthia (NSB - CN/Hangzhou)]

Hi,
Thanks for responding?
If split-brain happen in such kind of test is reasonable, how to fix this split-brain situation?

From: Ravishankar N [mailto:ravishankar at redhat.com]
Sent: Thursday, February 08, 2018 12:12 AM
To: Zhou, Cynthia (NSB - CN/Hangzhou) <cynthia.zhou at nokia-sbell.com>; Gluster-devel at gluster.org
Subject: Re: query about a split-brain problem found in glusterfs3.12.3




On 02/07/2018 10:39 AM, Zhou, Cynthia (NSB - CN/Hangzhou) wrote:

Hi glusterfs expert:
       Good day.
       Lately, we meet a glusterfs split brain problem in our env in /mnt/export/testdir. We start 3 ior process (IOR tool) from non-sn nodes, which is creating/removing files repeatedly in testdir. then we reboot sn nodes(sn0 and sn1) by sequence. Then we meet following problem.
    Do you have some comments on how this could happen? And how to fix it in this situation? Thanks!

Is the problem that split-brain is happening? Is this a replica 2 volume? If yes, then it looks like it is expected behavior?
Regards
Ravi



gluster volume heal export info
Brick sn-0.local:/mnt/bricks/export/brick
Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick
/testdir - Is in split-brain

/testdir - Possibly undergoing heal

Status: Connected
Number of entries: 2

wait for a while .....

gluster volume heal export info
Brick sn-0.local:/mnt/bricks/export/brick
Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick
/testdir - Possibly undergoing heal

/testdir - Possibly undergoing heal

and finally:

[root at sn-0:/root<http://sn-0/root>]
# gluster v heal export info
Brick sn-0.local:/mnt/bricks/export/brick<http://local/mnt/bricks/export/brick>
Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick<http://local/mnt/bricks/export/brick>
/testdir - Is in split-brain

Status: Connected
Number of entries: 1



[root at sn-0:/root<http://sn-0/root>]

# getfattr -m .* -d -e  hex /mnt/bricks/export/brick/testdir

getfattr: Removing leading '/' from absolute path names

# file: mnt/bricks/export/brick/testdir

trusted.gfid=0x5622cff893b3484dbdb6a20a0edb0e77

trusted.glusterfs.dht=0x000000010000000000000000ffffffff



[root at sn-1:/root<http://sn-1/root>]

# getfattr -m .* -d -e  hex /mnt/bricks/export/brick/testdir

getfattr: Removing leading '/' from absolute path names

# file: mnt/bricks/export/brick/testdir

trusted.afr.dirty=0x000000000000000000000001

trusted.afr.export-client-0=0x000000000000000000000038

trusted.gfid=0x5622cff893b3484dbdb6a20a0edb0e77

trusted.glusterfs.dht=0x000000010000000000000000ffffffff



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