Re: RE : Frequent connect and disconnect messages flooded in logs

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Hi,

as 6 servers with 12 bricks produce a lot of log files, I have uploaded the last 200 lines of a client on one server here:
http://paste.ubuntu.com/23558816/

When greping the C(ritical) messages, there is for example this one:
[2016-11-30 12:01:06.813333] C [rpc-clnt-ping.c:160:rpc_clnt_ping_timer_expired] 0-gv0-client-3: server X.X.X.107:49154 has not responded in the last 42 seconds, disconnecting.

For client-3, which is giant4:/gluster/sdc/gv0, I have uploaded the log for this brick here:
http://paste.ubuntu.com/23558818/

It's hard to tell how to reproduce this issue other than "put load on the servers/clients".
There are GPGPU compute jobs running on the nodes, but those only consume 4 of the 6 CPU cores.
The servers are not overloaded. All of them have 16 GB RAM and most of it is empty.
The load on the disks is also very small (<10% according to iostat)

What other information/logs can I provide?

Thanks,
Micha

Am 30.11.2016 um 06:57 schrieb Mohammed Rafi K C:

Hi Micha,

I have changed the thread and subject so that your original thread remain same for your query. Let's try to fix the problem what you observed with 3.8.4, So I have started a new thread to discuss the frequent disconnect problem.

If any one else has experienced the same problem, please respond to the mail.

It would be very helpful if you could give us some more logs from clients and bricks.  Also any reproducible steps will surely help to chase the problem further.

Regards

Rafi KC

On 11/30/2016 04:44 AM, Micha Ober wrote:
I had opened another thread on this mailing list (Subject: "After upgrade from 3.4.2 to 3.8.5 - High CPU usage resulting in disconnects and split-brain").

The title may be a bit misleading now, as I am no longer observing high CPU usage after upgrading to 3.8.6, but the disconnects are still happening and the number of files in split-brain is growing.

Setup: 6 compute nodes, each serving as a glusterfs server and client, Ubuntu 14.04, two bricks per node, distribute-replicate

I have two gluster volumes set up (one for scratch data, one for the slurm scheduler). Only the scratch data volume shows critical errors "[...] has not responded in the last 42 seconds, disconnecting.". So I can rule out network problems, the gigabit link between the nodes is not saturated at all. The disks are almost idle (<10%).

I have glusterfs 3.4.2 on Ubuntu 12.04 on a another compute cluster, running fine since it was deployed.
I had glusterfs 3.4.2 on Ubuntu 14.04 on this cluster, running fine for almost a year.

After upgrading to 3.8.5, the problems (as described) started. I would like to use some of the new features of the newer versions (like bitrot), but the users can't run their compute jobs right now because the result files are garbled.

There also seems to be a bug report with a smiliar problem: (but no progress)

For me, ALL servers are affected (not isolated to one or two servers)


For completeness (gv0 is the scratch volume, gv2 the slurm volume):

[root@giant2: ~]# gluster v info

Volume Name: gv0
Type: Distributed-Replicate
Volume ID: 993ec7c9-e4bc-44d0-b7c4-2d977e622e86
Status: Started
Snapshot Count: 0
Number of Bricks: 6 x 2 = 12
Transport-type: tcp
Bricks:
Brick1: giant1:/gluster/sdc/gv0
Brick2: giant2:/gluster/sdc/gv0
Brick3: giant3:/gluster/sdc/gv0
Brick4: giant4:/gluster/sdc/gv0
Brick5: giant5:/gluster/sdc/gv0
Brick6: giant6:/gluster/sdc/gv0
Brick7: giant1:/gluster/sdd/gv0
Brick8: giant2:/gluster/sdd/gv0
Brick9: giant3:/gluster/sdd/gv0
Brick10: giant4:/gluster/sdd/gv0
Brick11: giant5:/gluster/sdd/gv0
Brick12: giant6:/gluster/sdd/gv0
Options Reconfigured:
auth.allow: X.X.X.*,127.0.0.1
nfs.disable: on

Volume Name: gv2
Type: Replicate
Volume ID: 30c78928-5f2c-4671-becc-8deaee1a7a8d
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: giant1:/gluster/sdd/gv2
Brick2: giant2:/gluster/sdd/gv2
Options Reconfigured:
auth.allow: X.X.X.*,127.0.0.1
cluster.granular-entry-heal: on
cluster.locking-scheme: granular
nfs.disable: on


2016-11-30 0:10 GMT+01:00 Micha Ober <micha2k@xxxxxxxxx>:
There also seems to be a bug report with a smiliar problem: (but no progress)

For me, ALL servers are affected (not isolated to one or two servers)


For completeness (gv0 is the scratch volume, gv2 the slurm volume):

[root@giant2: ~]# gluster v info

Volume Name: gv0
Type: Distributed-Replicate
Volume ID: 993ec7c9-e4bc-44d0-b7c4-2d977e622e86
Status: Started
Snapshot Count: 0
Number of Bricks: 6 x 2 = 12
Transport-type: tcp
Bricks:
Brick1: giant1:/gluster/sdc/gv0
Brick2: giant2:/gluster/sdc/gv0
Brick3: giant3:/gluster/sdc/gv0
Brick4: giant4:/gluster/sdc/gv0
Brick5: giant5:/gluster/sdc/gv0
Brick6: giant6:/gluster/sdc/gv0
Brick7: giant1:/gluster/sdd/gv0
Brick8: giant2:/gluster/sdd/gv0
Brick9: giant3:/gluster/sdd/gv0
Brick10: giant4:/gluster/sdd/gv0
Brick11: giant5:/gluster/sdd/gv0
Brick12: giant6:/gluster/sdd/gv0
Options Reconfigured:
auth.allow: X.X.X.*,127.0.0.1
nfs.disable: on

Volume Name: gv2
Type: Replicate
Volume ID: 30c78928-5f2c-4671-becc-8deaee1a7a8d
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x 2 = 2
Transport-type: tcp
Bricks:
Brick1: giant1:/gluster/sdd/gv2
Brick2: giant2:/gluster/sdd/gv2
Options Reconfigured:
auth.allow: X.X.X.*,127.0.0.1
cluster.granular-entry-heal: on
cluster.locking-scheme: granular
nfs.disable: on


2016-11-29 19:21 GMT+01:00 Micha Ober <micha2k@xxxxxxxxx>:
I had opened another thread on this mailing list (Subject: "After upgrade from 3.4.2 to 3.8.5 - High CPU usage resulting in disconnects and split-brain").

The title may be a bit misleading now, as I am no longer observing high CPU usage after upgrading to 3.8.6, but the disconnects are still happening and the number of files in split-brain is growing.

Setup: 6 compute nodes, each serving as a glusterfs server and client, Ubuntu 14.04, two bricks per node, distribute-replicate

I have two gluster volumes set up (one for scratch data, one for the slurm scheduler). Only the scratch data volume shows critical errors "[...] has not responded in the last 42 seconds, disconnecting.". So I can rule out network problems, the gigabit link between the nodes is not saturated at all. The disks are almost idle (<10%).

I have glusterfs 3.4.2 on Ubuntu 12.04 on a another compute cluster, running fine since it was deployed.
I had glusterfs 3.4.2 on Ubuntu 14.04 on this cluster, running fine for almost a year.

After upgrading to 3.8.5, the problems (as described) started. I would like to use some of the new features of the newer versions (like bitrot), but the users can't run their compute jobs right now because the result files are garbled.

2016-11-29 18:53 GMT+01:00 Atin Mukherjee <amukherj@xxxxxxxxxx>:
Would you be able to share what is not working for you in 3.8.x (mention the exact version). 3.4 is quite old and falling back to an unsupported version doesn't look a feasible option.

On Tue, 29 Nov 2016 at 17:01, Micha Ober <micha2k@xxxxxxxxx> wrote:
Hi,

I was using gluster 3.4 and upgraded to 3.8, but that version showed to be unusable for me. I now need to downgrade.

I'm running Ubuntu 14.04. As upgrades of the op version are irreversible, I guess I have to delete all gluster volumes and re-create them with the downgraded version. 

0. Backup data
1. Unmount all gluster volumes
2. apt-get purge glusterfs-server glusterfs-client
3. Remove PPA for 3.8
4. Add PPA for older version
5. apt-get install glusterfs-server glusterfs-client
6. Create volumes

Is "purge" enough to delete all configuration files of the currently installed version or do I need to  manually clear some residues before installing an older version?

Thanks.
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- Atin (atinm)





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