[Gluster-users] Split brain that is not split brain

[Ilya Ivanov]

I don't understand why there's such a complicated process to recover when I
can just look at both files, decide which one I need and delete another one.


On Thu, Sep 11, 2014 at 7:56 AM, Pranith Kumar Karampuri <
pkarampu at redhat.com> wrote:

>
> 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 at redhat.com> 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 at gmail.com> 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 at 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 at 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 at redhat.com> 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 at 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 at redhat.com> 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
>>>>> <https://www.digitalocean.com/community/tutorials/how-to-create-a-redundant-storage-pool-using-glusterfs-on-ubuntu-servers>.
>>>>> 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.
>>>>>
>>>>>
>>>>>  --
>>>>> Ilya.
>>>>>
>>>>>
>>>>>  _______________________________________________
>>>>> Gluster-users mailing listGluster-users at gluster.orghttp://supercolony.gluster.org/mailman/listinfo/gluster-users
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Ilya.
>>>>
>>>>
>>>>
>>>
>>>
>>>  --
>>> Ilya.
>>>
>>
>>
>>
>> --
>> Ilya.
>>
>>
>>
>
>
> --
> Ilya.
>
>
>


-- 
Ilya.
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