Re: Split brain that is not split brain

[Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx>]

On 09/11/2014 09:29 AM, Ilya Ivanov wrote:

Right... I deleted it and now all appears to be fine.

Still, could you please elaborate on "gfid split-brain"?

Could you go through https://github.com/gluster/glusterfs/blob/master/doc/debugging/split-brain.md
Let us know if you would like something to be more clearer and we can add that and improve the document.

Pranith

On Thu, Sep 11, 2014 at 5:32 AM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:

On 09/11/2014 12:16 AM, Ilya Ivanov wrote:

Any insight?

Was the other file's gfid d3def9e1-c6d0-4b7d-a322-b5019305182e?
Could you check if this file exists in <brick>/.glusterfs/d3/de/
When a file is deleted this file also needs to be deleted if there are no more hardlinks to the file

Pranith

On Tue, Sep 9, 2014 at 8:35 AM, Ilya Ivanov <bearwere@xxxxxxxxx> wrote:

What's a gfid split-brain and how is it different from "normal" split-brain?

I accessed the file with stat, but "heal info" still shows "Number of entries: 1"

[root@gluster1 gluster]# getfattr -d -m. -e hex gv01/123
# getfattr -d -m. -e hex gv01/123
# file: gv01/123
trusted.afr.gv01-client-0=0x000000000000000000000000
trusted.afr.gv01-client-1=0x000000000000000000000000
trusted.gfid=0x35f86f4561134ba0bd1b94ef70179d4d

[root@gluster1 gluster]# getfattr -d -m. -e hex gv01
# file: gv01
trusted.afr.gv01-client-0=0x000000000000000000000000
trusted.afr.gv01-client-1=0x000000000000000000000000
trusted.gfid=0x00000000000000000000000000000001
trusted.glusterfs.dht=0x000000010000000000000000ffffffff
trusted.glusterfs.volume-id=0x31a2c4c486ca4344b838d2c2e6c716c1

On Tue, Sep 9, 2014 at 8:19 AM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:

On 09/09/2014 11:35 AM, Ilya Ivanov wrote:

Ahh, thank you, now I get it. I deleted it on one node and it replicated to another one. Now I get the following output:

[root@gluster1 var]# gluster volume heal gv01 info
Brick gluster1:/home/gluster/gv01/
<gfid:d3def9e1-c6d0-4b7d-a322-b5019305182e>
Number of entries: 1

Brick gluster2:/home/gluster/gv01/
Number of entries: 0

Is it normal? Why the number of entries isn't reset to 0?

If you access the file using ls/stat etc, it will be fixed. But before that could you please post the output of 'getfattr -d -m. -e hex file/path/in/backend/brick' and 'getfattr -d -m. -e hex parent/dir/to/file/path/in/backend/brick'

Pranith

And why wouldn't the file show up in split-brain before, anyway?

Gfid split-brains are not shown in heal-info-split-brain yet.

Pranith

On Tue, Sep 9, 2014 at 7:46 AM, Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:

On 09/09/2014 01:54 AM, Ilya Ivanov wrote:

Hello.

I've Gluster 3.5.2 on Centos 6. A primitive replicated volume, as describe here. I tried to simulate split-brain by temporarily disconnecting the nodes and creating a file with the same name and different contents. That worked.

The question is, how do I fix it now? All the tutorials suggest deleting the file from one of the nodes. I can't do that, it reports "Input/output error". The file won't even show up in "gluster volume heal gv00 info split-brain". That shows 0 entries.

The deletion needs to happen on one of the bricks, not from the mount point.

Pranith

I can see the file in "gluster volume heal gv00 info heal-failed", though.

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