[Gluster-users] Interesting split-brain...

[Mohammed Rafi K C]

Can you please explain How we ended up in this scenario. I think that
will help to understand more about this scenarios and why gluster
recommend replica 3 or arbiter volume.

Regards

Rafi KC


On 06/15/2017 10:46 AM, Karthik Subrahmanya wrote:
> Hi Ludwig,
>
> There is no way to resolve gfid split-brains with type mismatch. You
> have to do it manually by following the steps in [1].
> In case of type mismatch it is recommended to resolve it manually. But
> for only gfid mismatch in 3.11 we have a way to
> resolve it by using the *favorite-child-policy*.
> Since the file is not important, you can go with deleting that.
>
> [1]
> https://gluster.readthedocs.io/en/latest/Troubleshooting/split-brain/#fixing-directory-entry-split-brain
>
> HTH,
> Karthik
>
> On Thu, Jun 15, 2017 at 8:23 AM, Ludwig Gamache <ludwig at elementai.com
> <mailto:ludwig at elementai.com>> wrote:
>
>     I am new to gluster but already like it. I did a maintenance last
>     week where I shutdown both nodes (one after each others). I had
>     many files that needed to be healed after that. Everything worked
>     well, except for 1 file. It is in split-brain, with 2 different
>     GFID. I read the documentation but it only covers the cases where
>     the GFID is the same on both bricks. BTW, I am running Gluster 3.10.
>
>     Here are some details...
>
>     [root at NAS-01 .glusterfs]# gluster volume heal data01 info
>
>     Brick 192.168.186.11:/mnt/DATA/data
>
>     /abc/.zsh_history 
>
>     /abc - Is in split-brain
>
>
>     Status: Connected
>
>     Number of entries: 2
>
>
>     Brick 192.168.186.12:/mnt/DATA/data
>
>     /abc - Is in split-brain
>
>
>     /abc/.zsh_history 
>
>     Status: Connected
>
>     Number of entries: 2
>
>
>     On brick 1:
>
>     [root at NAS-01 abc]# ls -lart
>
>     total 75
>
>     drwxr-xr-x.  2 root  root  2 Jun  8 13:26 .zsh_history
>
>     drwxr-xr-x.  3 12078 root  3 Jun 12 11:36 .
>
>     drwxrwxrwt. 17 root  root 17 Jun 12 12:20 ..
>
>
>     On brick 2:
>
>     [root at DC-MTL-NAS-02 abc]# ls -lart
>
>     total 66
>
>     -rw-rw-r--.  2 12078 12078 1085 Jun 12 04:42 .zsh_history
>
>     drwxr-xr-x.  2 12078 root     3 Jun 12 10:36 .
>
>     drwxrwxrwt. 17 root  root    17 Jun 12 11:20 ..
>
>
>     Notice that on one brick, it is a file and on the other one it is
>     a directory.
>
>     On brick 1:
>
>     [root at NAS-01 abc]# getfattr -d -m . -e hex
>     /mnt/DATA/data/abc/.zsh_history
>
>     getfattr: Removing leading '/' from absolute path names
>
>     # file: mnt/DATA/data/abc/.zsh_history
>
>     security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000
>
>     trusted.afr.data01-client-0=0x000000000000000000000000
>
>     trusted.afr.data01-client-1=0x000000000000000200000000
>
>     trusted.gfid=0xdee43407139d41f091d13e106a51f262
>
>     trusted.glusterfs.dht=0x000000010000000000000000ffffffff
>
>
>     On brick 2:
>
>     root at NAS-02 abc]# getfattr -d -m . -e hex
>     /mnt/DATA/data/abc/.zsh_history 
>
>     getfattr: Removing leading '/' from absolute path names
>
>     # file: mnt/DATA/data/abc/.zsh_history
>
>     security.selinux=0x73797374656d5f753a6f626a6563745f723a756e6c6162656c65645f743a733000
>
>     trusted.afr.data01-client-0=0x000000170000000200000000
>
>     trusted.afr.data01-client-1=0x000000000000000000000000
>
>     trusted.bit-rot.version=0x060000000000000059397acd0005dadd
>
>     trusted.gfid=0xa70ae9af887a4a37875f5c7c81ebc803
>
>
>     Any recommendation on how to recover from that? BTW, the file is
>     not important and I could easily get rid of it without impact. So,
>     if this is an easy solution...
>
>     Regards,
>
>     -- 
>     Ludwig Gamache
>
>
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