[Gluster-users] [Gluster-devel] Self Heal and dangling symlinks

[Joe Julian]

That looks like you haven't had a split-brain since the 9th of October...

On 11/21/2013 02:43 PM, Alexandre Fournier wrote:
> I would like also to inform you about the information about the split-brain we have :
>
> 2013-10-09 22:02:59 <gfid:83b39e48-f8eb-4149-b851-d3b97e18c4b6>
> 2013-10-09 21:52:59 <gfid:85378e3f-0dd1-4f8e-a7d5-70424b643fb9>
> 2013-10-09 21:52:59 <gfid:0a958cad-1615-4e1b-8e1a-9dc0356859d6>
> 2013-10-09 21:52:59 <gfid:54b02fde-69d2-4da2-8372-2a7af89a0ae1>
> 2013-10-09 21:52:59 <gfid:4702c3ab-a2bb-43e3-ae2c-ecb5b440f368>
> 2013-10-09 21:52:59 <gfid:8fe46824-a9f1-4095-b204-e9e137ae8643>
> ...
> Count : 1023
>
> We tried to clean all the dangling links but they are still coming back the split-brain is not resolved.
>
> It maybe the root cause of the problem, how do we resolve those split brain?
>
> -----Original Message-----
> From: Alexandre Fournier
> Sent: 21 novembre 2013 15:20
> To: 'Lalatendu Mohanty'; Pranith Kumar Karampuri
> Cc: gluster-users at gluster.org; gluster-devel at nongnu.org
> Subject: RE: [Gluster-devel] [Gluster-users] Self Heal and dangling symlinks
>
> Ok here is the information :
>
> Stat :
>    File: `/aa/aa/aa/aa/aa/aa/aa
>    Size: 14364           Blocks: 32         IO Block: 4096   regular file
> Device: 822h/2082d      Inode: 3155137861  Links: 2
> Access: (0644/-rw-r--r--)  Uid: (   33/www-data)   Gid: (   33/www-data)
> Access: 2013-11-21 13:14:58.527765935 +0000
> Modify: 2013-11-13 13:19:13.736226050 +0000
> Change: 2013-11-13 13:19:13.736226050 +0000
>
>    File: `/aa/aa/aa/aa/aa/aa/aa
>    Size: 14364           Blocks: 32         IO Block: 4096   regular file
> Device: 822h/2082d      Inode: 3076494286  Links: 2
> Access: (0644/-rw-r--r--)  Uid: (   33/www-data)   Gid: (   33/www-data)
> Access: 2013-11-21 13:14:58.527674754 +0000
> Modify: 2013-11-13 13:19:13.736442464 +0000
> Change: 2013-11-13 13:19:13.736442464 +0000
>   Birth: -
>
> Attributes :
>
> # file: aa/aa/aa/aa/aa/aa/aa
> trusted.afr.gv0-client-0=0x000000000000000000000000
> trusted.afr.gv0-client-1=0x000000000000000000000000
> trusted.gfid=0xb5b8c3ec9dd24609b56476651113d3fa
>
>
> # file: aa/aa/aa/aa/aa/aa/aa
> trusted.afr.gv0-client-0=0x000000000000000000000000
> trusted.afr.gv0-client-1=0x000000000000000000000000
> trusted.gfid=0xb5b8c3ec9dd24609b56476651113d3fa
>
>
> -----Original Message-----
> From: Lalatendu Mohanty [mailto:lmohanty at redhat.com]
> Sent: 21 novembre 2013 14:05
> To: Alexandre Fournier; Pranith Kumar Karampuri
> Cc: gluster-users at gluster.org; gluster-devel at nongnu.org
> Subject: Re: [Gluster-devel] [Gluster-users] Self Heal and dangling symlinks
>
> On 11/21/2013 07:54 PM, Alexandre Fournier wrote:
>> They are both regular file on the node and the replicas and they have
>> the same GFID.  I ran also the gluster volume heal gv0 split-brain
>> command and the file is not in the list.  We have an entire directory
>> though (1023 entry on a node)
>>
>> However, the file was already on the brick before uploading it and I noticed that that the write did not work since the last modification date does not match the upload time.
>>
>> Through a web service, we offer to upload files on the gluster mount.   This web service  upload the file on a temporary folder and then MOVE the file on the gluster mount.
>>
>> Could the move operation give strange behavior like this?
> Alexandre,
>
> No, it should not. Please let us know the answers of the questions Pranith and I asked, so we can understand the root cause of your problem.
>
>> Alexandre Fournier
>> Tools Programmer
>> Ubisoft Production Services
>>
>>
>> -----Original Message-----
>> From: Pranith Kumar Karampuri [mailto:pkarampu at redhat.com]
>> Sent: 21 novembre 2013 00:47
>> To: Lalatendu Mohanty
>> Cc: Alexandre Fournier; gluster-users at gluster.org;
>> gluster-devel at nongnu.org
>> Subject: Re: [Gluster-devel] [Gluster-users] Self Heal and dangling
>> symlinks
>>
>> Alexandre,
>>      Seems like there is an entry split-brain (same file/dir name but on one brick it is a file and on the other it is a directory) according to the following log:
>>> [2013-11-18 18:18:43.052446] W
>>> [afr-common.c:1411:afr_conflicting_iattrs]
>>> 0-gv0-replicate-0: /aa/aa/aa/aa: filetype differs on subvolumes (0,
>>> 1)
>> Could you get us the output of "stat <brick-dir-path>/aa/aa/aa/aa/aa" and "getfattr -d -m. -e hex <brick-dir-path>/aa/aa/aa/aa/aa" on both the bricks.
>>
>> Pranith
>> ----- Original Message -----
>>> From: "Lalatendu Mohanty" <lmohanty at redhat.com>
>>> To: "Alexandre Fournier" <alexandre.fournier at ubisoft.com>,
>>> gluster-users at gluster.org, gluster-devel at nongnu.org
>>> Sent: Thursday, November 21, 2013 1:28:01 AM
>>> Subject: Re: [Gluster-devel] [Gluster-users] Self Heal and dangling
>>> symlinks
>>>
>>> On 11/19/2013 10:49 PM, Alexandre Fournier wrote:
>>>
>>>
>>>
>>>
>>>
>>> Hello,
>>>
>>>
>>>
>>> We are experiencing strange behavior when writing file on the Gluster
>>> mount point. On some occasion, when writing to the Gluster Mount we
>>> have an Open Stream error. We’ve looked the gluster logs and found
>>> the following faulty entries :
>>>
>>>
>>>
>>> [From /var/log/glusterfs/mnt-gv0.log]
>>>
>>>
>>>
>>> [2013-11-18 18:18:43.052446] W
>>> [afr-common.c:1411:afr_conflicting_iattrs]
>>> 0-gv0-replicate-0: /aa/aa/aa/aa: filetype differs on subvolumes (0,
>>> 1)
>>>
>>> [2013-11-18 18:18:43.052468] E
>>> [afr-self-heal-common.c:1409:afr_sh_common_lookup_cbk] 0-gv0-replicate-0:
>>> Conflicting entries for /aa/aa/aa/aa
>>>
>>> [2013-11-18 18:18:43.052757] E
>>> [afr-self-heal-common.c:2160:afr_self_heal_completion_cbk]
>>> 0-gv0-replicate-0: background meta-data data entry missing-entry gfid
>>> self-heal
>>>
>>> failed on /aa/aa/aa/aa/aa
>>>
>>> [2013-11-18 18:18:43.052780] W [fuse-bridge.c:292:fuse_entry_cbk]
>>> 0-glusterfs-fuse: 439382194: LOOKUP() /aa/aa/aa/aa/aa => -1
>>> (Input/output
>>> error)
>>>
>>>
>>>
>>> We’ve looked at the log file etc-glusterfs-glusterd.vol.log but we
>>> found nothing related to this problem. Then, we’ve looked at the log
>>>  From /var/log/glusterfs/bricks/mnt-data.log and we found 70 gig of
>>> logs of the same type :
>>>
>>>
>>>
>>> [2013-11-19 17:13:32.269757] W [posix-handle.c:538:posix_handle_soft]
>>> 0-gv0-posix: symlink
>>> ../../ab/fe/abfeb61c-501d-4417-b8fb-0accdd57146f/cf ->
>>> /mnt/data/.glusterfs/ab/fe/abfeb61c-501d-4417-b8fb-0accdd57146f/cf
>>> failed (No such file or directory)
>>>
>>> [2013-11-19 17:13:32.269978] W [posix-handle.c:538:posix_handle_soft]
>>> 0-gv0-posix: symlink
>>> ../../c7/8b/c78be78f-cc95-47b2-a27f-4217f1759b67/d2 ->
>>> /mnt/data/.glusterfs/c7/8b/c78be78f-cc95-47b2-a27f-4217f1759b67/d2
>>> failed (No such file or directory)
>>>
>>> [2013-11-19 17:13:32.270190] W [posix-handle.c:538:posix_handle_soft]
>>> 0-gv0-posix: symlink
>>> ../../5a/8f/5a8fa43c-4ccc-4d88-9122-a96bc8ffaebc/f2 ->
>>> /mnt/data/.glusterfs/5a/8f/5a8fa43c-4ccc-4d88-9122-a96bc8ffaebc/f2
>>> failed (No such file or directory)
>>>
>>>
>>>
>>> This looks like a bug, unless there is something wrong with the
>>> set-up. I have copied gluster-devel in this thread as I think they might help.
>>>
>>> Just curious, is all your gluster nodes have equal time (i.e. ntp synced).
>>>
>>>
>>>
>>>
>>>
>>>
>>> And it does not stop logging. It seems that the self heal is not
>>> working properly when there are broking symlinks in the gluster. It
>>> is worth saying also that this log is only produce on a single node
>>> but the write fail on several node though. Also, we try to clean the
>>> symlinks manually but it always come back.
>>>
>>>
>>>
>>> Is it possible to recover from broken symlinks?
>>>
>>>
>>>
>>> Configuration :
>>>
>>> Gluster Version : 3.3.2
>>>
>>> Cluster setup : 4 X 2
>>>
>>> OS : Ubuntu
>>>
>>> On Fuse
>>>
>>>
>>>
>>> Thanks,
>>>
>>>
>>>
>>> Alexandre
>>>
>>>
>>>
>>>
>>> _______________________________________________
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>>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>>
>>>
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