[Gluster-users] Locking failed - since upgrade to 3.6.4

Mon Aug 3 15:01:16 UTC 2015

Hi,

OK I have tracked through the logs which of the hosts apparently has a lock open:

[2015-08-03 14:55:37.602717] I [glusterd-handler.c:3836:__glusterd_handle_status_volume] 0-management: Received status volume req for volume blogs

[2015-08-03 14:51:57.791081] E [glusterd-utils.c:148:glusterd_lock] 0-management: Unable to get lock for uuid: 76e4398c-e00a-4f3b-9206-4f885c4e5206, lock held by: 76e4398c-e00a-4f3b-9206-4f885c4e5206

I have identified the UID for each peer via gluster peer status and working backwards.

I see that gluster volume clear-locks may the locks on the volume - but is not clear from the logs is what the path is that has the lock or the kind that is locked.

Incidentally my clients (using NFS) through manual testing appear to still be able to read/write to the volume - it is the volume status and heal checks that are failing. All of my clients and servers have been sequentially rebooted in the hope that this would clear any issue - however that doe not appear to be the case.

Thanks

Paul

Paul Osborne
Senior Systems Engineer
Canterbury Christ Church University
Tel: 01227 782751

________________________________
From: Atin Mukherjee <atin.mukherjee83 at gmail.com>
Sent: 03 August 2015 15:22
To: Osborne, Paul (paul.osborne at canterbury.ac.uk)
Cc: gluster-users at gluster.org
Subject: Re: [Gluster-users] Locking failed - since upgrade to 3.6.4

Could you check the glusterd log at the other nodes, that would give you the hint of the exact issue. Also looking at .cmd_log_history will give you the time interval at which volume status commands are executed. If the gap is in milisecs then you are bound to hit it and its expected.

-Atin
Sent from one plus one

On Aug 3, 2015 7:32 PM, "Osborne, Paul (paul.osborne at canterbury.ac.uk<mailto:paul.osborne at canterbury.ac.uk>)" <paul.osborne at canterbury.ac.uk<mailto:paul.osborne at canterbury.ac.uk>> wrote:

Hi,

Last week I upgraded one of my gluster clusters (3 hosts with bricks as replica 3) to 3.6.4 from 3.5.4 and all seemed well.

Today I am getting reports that locking has failed:

gfse-cant-01:/var/log/glusterfs# gluster volume status
Locking failed on gfse-rh-01.core.canterbury.ac.uk<http://gfse-rh-01.core.canterbury.ac.uk>. Please check log file for details.
Locking failed on gfse-isr-01.core.canterbury.ac.uk<http://gfse-isr-01.core.canterbury.ac.uk>. Please check log file for details.

Logs:
[2015-08-03 13:45:29.974560] E [glusterd-syncop.c:1640:gd_sync_task_begin] 0-management: Locking Peers Failed.
[2015-08-03 13:49:48.273159] E [glusterd-syncop.c:105:gd_collate_errors] 0-: Locking failed on gfse-rh-01.core.canterbury.ac.uk<http://gfse-rh-01.core.canterbury.ac.uk>. Please ch
eck log file for details.
[2015-08-03 13:49:48.273778] E [glusterd-syncop.c:105:gd_collate_errors] 0-: Locking failed on gfse-isr-01.core.canterbury.ac.uk<http://gfse-isr-01.core.canterbury.ac.uk>. Please c
heck log file for details.

I am wondering if this is a new feature due to 3.6.4 or something that has gone wrong.

Restarting gluster entirely (btw the restart script does not actually appear to kill the processes...) resolves the issue but then it repeats a few minutes later which is rather suboptimal for a running service.

Googling suggests that there may be simultaneous actions going on that can cause a locking issue.

I know that I have nagios running volume status <volname> for each of my volumes on each host every few minutes however this is not new and has been in place for the last 8-9 months that against 3.5 without issue so would hope that this is not causing the issue.

I am not sure where to look now tbh.

Paul Osborne
Senior Systems Engineer
Canterbury Christ Church University
Tel: 01227 782751
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