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

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Hi Micha,

Can you please also see if there is any error messages in dmesg ? Basically I'm trying to see whether your hitting issues described in https://bugzilla.kernel.org/show_bug.cgi?id=73831 .


Regards

Rafi KC


On 12/19/2016 11:58 AM, Mohammed Rafi K C wrote:

Hi Micha,

Sorry for the late reply. I was busy with some other things.

If you have still the setup available Can you enable TRACE log level [1],[2] and see if you could find any log entries when the network start disconnecting. Basically I'm trying to find out any disconnection had occurred other than ping timer expire issue.



[1] : gluster volume <volname> diagnostics.brick-log-level TRACE

[2] : gluster volume <volname> diagnostics.client-log-level TRACE


Regards

Rafi KC


On 12/08/2016 07:59 PM, Atin Mukherjee wrote:


On Thu, Dec 8, 2016 at 4:37 PM, Micha Ober <micha2k@xxxxxxxxx> wrote:
Hi Rafi,

thank you for your support. It is greatly appreciated.

Just some more thoughts from my side:

There have been no reports from other  users in *this* thread until now, but I have found at least one user with a very simiar problem in an older thread:

https://www.gluster.org/pipermail/gluster-users/2014-November/019637.html

He is also reporting disconnects  with no apparent reasons, althogh his setup is a bit more complicated, also involving a firewall. In our setup, all servers/clients are connected via 1 GbE with no firewall or anything that might block/throttle traffic. Also, we are using exactly the same software versions on all nodes.


I can also find some reports in the bugtracker when searching for "rpc_client_ping_timer_expired" and "rpc_clnt_ping_timer_expired" (looks like spelling changed during versions).

https://bugzilla.redhat.com/show_bug.cgi?id=1096729

Just FYI, this is a different issue, here GlusterD fails to handle the volume of incoming requests on time since MT-epoll is not enabled here.
 

https://bugzilla.redhat.com/show_bug.cgi?id=1370683

But both reports involve large traffic/load on the bricks/disks, which is not the case for out setup.
To give a ballpark figure: Over three days, 30 GiB were written. And the data was not written at once, but continuously over the whole time.


Just to be sure, I have checked the logfiles of one of the other clusters right now, which are sitting in the same building, in the same rack, even on the same switch, running the same jobs, but with glusterfs 3.4.2 and I can see no disconnects in the logfiles. So I can definitely rule out our infrastructure as problem.

Regards,
Micha



Am 07.12.2016 um 18:08 schrieb Mohammed Rafi K C:

Hi Micha,

This is great. I will provide you one debug build which has two fixes which I possible suspect for a frequent disconnect issue, though I don't have much data to validate my theory. So I will take one more day to dig in to that.

Thanks for your support, and opensource++ 

Regards

Rafi KC

On 12/07/2016 05:02 AM, Micha Ober wrote:
Hi,

thank you for your answer and even more for the question!
Until now, I was using FUSE. Today I changed all mounts to NFS using the same 3.7.17 version.

But: The problem is still the same. Now, the NFS logfile contains lines like these:

[2016-12-06 15:12:29.006325] C [rpc-clnt-ping.c:165:rpc_clnt_ping_timer_expired] 0-gv0-client-7: server X.X.18.62:49153 has not responded in the last 42 seconds, disconnecting.

Interestingly enough,  the IP address X.X.18.62 is the same machine! As I wrote earlier, each node serves both as a server and a client, as each node contributes bricks to the volume. Every server is connecting to itself via its hostname. For example, the fstab on the node "giant2" looks like:

#giant2:/gv0    /shared_data    glusterfs       defaults,noauto 0       0
#giant2:/gv2    /shared_slurm   glusterfs       defaults,noauto 0       0

giant2:/gv0     /shared_data    nfs             defaults,_netdev,vers=3 0       0
giant2:/gv2     /shared_slurm   nfs             defaults,_netdev,vers=3 0       0

So I understand the disconnects even less.

I don't know if it's possible to create a dummy cluster which exposes the same behaviour, because the disconnects only happen when there are compute jobs running on those nodes - and they are GPU compute jobs, so that's something which cannot be easily emulated in a VM.

As we have more clusters (which are running fine with an ancient 3.4 version :-)) and we are currently not dependent on this particular cluster (which may stay like this for this month, I think) I should be able to deploy the debug build on the "real" cluster, if you can provide a debug build.

Regards and thanks,
Micha



Am 06.12.2016 um 08:15 schrieb Mohammed Rafi K C:



On 12/03/2016 12:56 AM, Micha Ober wrote:
** Update: ** I have downgraded from 3.8.6 to 3.7.17 now, but the problem still exists.

Client log: http://paste.ubuntu.com/23569065/
Brick log: http://paste.ubuntu.com/23569067/

Please note that each server has two bricks.
Whereas, according to the logs, one brick loses the connection to all other hosts:
[2016-12-02 18:38:53.703301] W [socket.c:596:__socket_rwv] 0-tcp.gv0-server: writev on X.X.X.219:49121 failed (Broken pipe)
[2016-12-02 18:38:53.703381] W [socket.c:596:__socket_rwv] 0-tcp.gv0-server: writev on X.X.X.62:49118 failed (Broken pipe)
[2016-12-02 18:38:53.703380] W [socket.c:596:__socket_rwv] 0-tcp.gv0-server: writev on X.X.X.107:49121 failed (Broken pipe)
[2016-12-02 18:38:53.703424] W [socket.c:596:__socket_rwv] 0-tcp.gv0-server: writev on X.X.X.206:49120 failed (Broken pipe)
[2016-12-02 18:38:53.703359] W [socket.c:596:__socket_rwv] 0-tcp.gv0-server: writev on X.X.X.58:49121 failed (Broken pipe)

The SECOND brick on the SAME host is NOT affected, i.e. no disconnects!
As I said, the network connection is fine and the disks are idle.
The CPU always has 2 free cores.

It looks like I have to downgrade to 3.4 now in order for the disconnects to stop.

Hi Micha,

Thanks for the update and sorry for what happened with gluster higher versions. I can understand the need for downgrade as it is a production setup.

Can you tell me the clients used here ? whether it is a fuse,nfs,nfs-ganesha, smb or libgfapi ?

Since I'm not able to reproduce the issue (I have been trying from last 3days) and the logs are not much helpful here (we don't have much logs in socket layer), Could you please create a dummy cluster and try to reproduce the issue? If then we can play with that volume and I could provide some debug build which we can use for further debugging?

If you don't have bandwidth for this, please leave it ;).

Regards
Rafi KC

- 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)
https://bugzilla.redhat.com/show_bug.cgi?id=1370683

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)
https://bugzilla.redhat.com/show_bug.cgi?id=1370683

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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