Bug 1276229

+++ This bug was initially created as a clone of Bug #1275247 +++

Description of problem:



On 10/21/2015 05:55 PM, Adrian Gruntkowski wrote:
> Hello,
>
> I'm trying to track down a problem with my setup (version 3.7.3 on Debian stable).
>
> I have a couple of volumes setup in 3-node configuration with 1 brick as an arbiter for each.
>
> There are 4 volumes set up in cross-over across 3 physical servers, like this:
>
>
>
>              ------------------------------------->[ GigabitEthernet switch ]<--------------------------
>              |                                                ^                                        |
>              |                                                |                                        |
>              V                                                V                                        V
> /-------------------------- \                   /-------------------------- \             /-------------------------- \
> | web-rep                   |                   | cluster-rep               |             | mail-rep                  |
> |                           |                   |                           |             |                           |
> | vols:                     |                   | vols:                     |             | vols:                     |
> | system_www1               |                   | system_www1               |             | system_www1(arbiter)      |
> | data_www1                 |                   | data_www1                 |             | data_www1(arbiter)        |
> | system_mail1(arbiter)     |                   | system_mail1              |             | system_mail1              |
> | data_mail1(arbiter)       |                   | data_mail1                |             | data_mail1                |
> \---------------------------/                   \---------------------------/             \---------------------------/
>
>
> Now, after a fresh boot-up, everything seems to be running fine.
> Then I start copying big files (KVM disk images) from local disk to gluster mounts.
> In the beginning it seems to be running fine (although iowait seems go so high that it clogs up io operations
> at some moments, but that's an issue for later). After some time the transfer freezes, then
> after some (long) time, it advances in a short burst to freeze again. Another interesting thing is that
> I see constant flow of the network traffic on interfaces dedicated to gluster, even when there's a "freeze".
>
> I have done "gluster volume statedump" at that time of transfer (file is copied from local disk on cluster-rep
> onto local mount of "system_www1" volume). I've observer a following section in the dump for cluster-rep node:
>
> [xlator.features.locks.system_www1-locks.inode]
> path=/images/101/vm-101-disk-1.qcow2
> mandatory=0
> inodelk-count=12
> lock-dump.domain.domain=system_www1-replicate-0:self-heal
> inodelk.inodelk[0](ACTIVE)=type=WRITE, whence=0, start=0, len=0, pid = 18446744073709551610, owner=c811600cd67f0000, client=0x7fbe100df280, connection-id=cluster-vm-3603-2015/10/21-10:35:54:596929-system_www1-client-0-0-0, granted at 2015-10-21 11:36:22
> lock-dump.domain.domain=system_www1-replicate-0
> inodelk.inodelk[0](ACTIVE)=type=WRITE, whence=0, start=2195849216, len=131072, pid = 18446744073709551610, owner=c811600cd67f0000, client=0x7fbe100df280, connection-id=cluster-vm-3603-2015/10/21-10:35:54:596929-system_www1-client-0-0-0, granted at 2015-10-21 11:37:45
> inodelk.inodelk[1](ACTIVE)=type=WRITE, whence=0, start=9223372036854775805, len=1, pid = 18446744073709551610, owner=c811600cd67f0000, client=0x7fbe100df280, connection-id=cluster-vm-3603-2015/10/21-10:35:54:596929-system_www1-client-0-0-0, granted at 2015-10-21 11:36:22

From the statedump, It looks like self-heal daemon had taken locks to heal the file due to which the locks attempted by the client (mount) are in blocked state.
In Arbiter volumes the client (mount) takes full locks (start=0, len=0) for every write() as opposed to normal replica volumes which take range locks (i.e. appropriate start,len values) for that write(). This is done to avoid network split-brains.
So in normal replica volumes, clients can still write to a file while heal is going on, as long as the offsets don't overlap. This is not the case with arbiter volumes.
You can look at the client or glustershd logs to see if there are messages that indicate healing of a file, something along the lines of "Completed data selfheal on xxx"

> inodelk.inodelk[2](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=c4fd2d78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[3](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=dc752e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[4](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=34832e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[5](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=d44d2e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[6](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=306f2e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[7](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=8c902e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[8](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=782c2e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[9](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=1c0b2e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
> inodelk.inodelk[10](BLOCKED)=type=WRITE, whence=0, start=0, len=0, pid = 0, owner=24332e78487f0000, client=0x7fbe100e1380, connection-id=cluster-vm-3846-2015/10/21-10:36:03:123909-system_www1-client-0-0-0, blocked at 2015-10-21 11:37:45
>
> There seem to be multiple locks in BLOCKED state - which doesn't look normal to me. The other 2 nodes have
> only 2 ACTIVE locks at the same time.
>
> Below is "gluster volume info" output.
>
> # gluster volume info
>  
> Volume Name: data_mail1
> Type: Replicate
> Volume ID: fc3259a1-ddcf-46e9-ae77-299aaad93b7c
> Status: Started
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: cluster-rep:/GFS/data/mail1
> Brick2: mail-rep:/GFS/data/mail1
> Brick3: web-rep:/GFS/data/mail1
> Options Reconfigured:
> performance.readdir-ahead: on
> cluster.quorum-count: 2
> cluster.quorum-type: fixed
> cluster.server-quorum-ratio: 51%
>  
> Volume Name: data_www1
> Type: Replicate
> Volume ID: 0c37a337-dbe5-4e75-8010-94e068c02026
> Status: Started
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: cluster-rep:/GFS/data/www1
> Brick2: web-rep:/GFS/data/www1
> Brick3: mail-rep:/GFS/data/www1
> Options Reconfigured:
> performance.readdir-ahead: on
> cluster.quorum-type: fixed
> cluster.quorum-count: 2
> cluster.server-quorum-ratio: 51%
>  
> Volume Name: system_mail1
> Type: Replicate
> Volume ID: 0568d985-9fa7-40a7-bead-298310622cb5
> Status: Started
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: cluster-rep:/GFS/system/mail1
> Brick2: mail-rep:/GFS/system/mail1
> Brick3: web-rep:/GFS/system/mail1
> Options Reconfigured:
> performance.readdir-ahead: on
> cluster.quorum-type: none
> cluster.quorum-count: 2
> cluster.server-quorum-ratio: 51%
>  
> Volume Name: system_www1
> Type: Replicate
> Volume ID: 147636a2-5c15-4d9a-93c8-44d51252b124
> Status: Started
> Number of Bricks: 1 x 3 = 3
> Transport-type: tcp
> Bricks:
> Brick1: cluster-rep:/GFS/system/www1
> Brick2: web-rep:/GFS/system/www1
> Brick3: mail-rep:/GFS/system/www1
> Options Reconfigured:
> performance.readdir-ahead: on
> cluster.quorum-type: none
> cluster.quorum-count: 2
> cluster.server-quorum-ratio: 51%
>
> The issue does not occur when I get rid of 3rd arbiter brick.

What do you mean by 'getting rid of'? Killing the 3rd brick process of the volume?

Regards,
Ravi
>
> If there's any additional information that is missing and I could provide, please let me know.
>
> Greetings,
> Adrian
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users
> http://www.gluster.org/mailman/listinfo/gluster-users



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Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

--- Additional comment from Vijay Bellur on 2015-10-26 07:30:25 EDT ---

REVIEW: http://review.gluster.org/12426 (cluster/afr: disable self-heal lock compatibility for arbiter volumes) posted (#1) for review on master by Pranith Kumar Karampuri (pkarampu)

--- Additional comment from Vijay Bellur on 2015-10-29 03:05:57 EDT ---

COMMIT: http://review.gluster.org/12426 committed in master by Pranith Kumar Karampuri (pkarampu) 
------
commit 33b1e373ee40546e1aeed00d4f5f7bfd6d9fefb9
Author: Pranith Kumar K <pkarampu>
Date:   Mon Oct 26 16:56:25 2015 +0530

    cluster/afr: disable self-heal lock compatibility for arbiter volumes
    
    Problem:
    afrv2 takes locks from infinity-2 to infinity-1 to be compatible with <=3.5.x
    clients. For arbiter volumes this leads to problems as the I/O takes full file
    locks.
    
    Solution:
    Don't be compatible with <=3.5.x clients on arbiter volumes as arbiter volumes
    are introduced in 3.7
    
    Change-Id: I48d6aab2000cab29c0c4acbf0ad356a3fa9e7bab
    BUG: 1275247
    Signed-off-by: Pranith Kumar K <pkarampu>
    Reviewed-on: http://review.gluster.org/12426
    Reviewed-by: Krutika Dhananjay <kdhananj>
    Reviewed-by: Vijay Bellur <vbellur>
    Reviewed-by: Ravishankar N <ravishankar>
    Tested-by: NetBSD Build System <jenkins.org>