Gluster users - Jan 2018 - Strange messages in mnt-xxx.log

Hi,

I'm testing gluster 3.12.4 and, by inspecting log files 
/var/log/glusterfs/mnt-gv0.log (gv0 is the volume name), I found many 
lines saying:

[2018-01-15 09:45:41.066914] I [MSGID: 109063] 
[dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies in 
(null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1 overlaps=0
[2018-01-15 09:45:45.755021] I [MSGID: 109063] 
[dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies in 
(null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1 overlaps=0
[2018-01-15 14:02:29.171437] I [MSGID: 109063] 
[dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies in 
(null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1 overlaps=0

What do they mean ? Is there any real problem ?

Thank you,


-- 
Ing. Luca Lazzeroni
Responsabile Ricerca e Sviluppo
Trend Servizi Srl
Tel: 0376/631761
Web: https://www.trendservizi.it

Hi,


On 16 January 2018 at 18:56, Ing. Luca Lazzeroni - Trend Servizi Srl <
luca at trendservizi.it> wrote:
> Hi,
>
> I'm testing gluster 3.12.4 and, by inspecting log files
> /var/log/glusterfs/mnt-gv0.log (gv0 is the volume name), I found many lines
> saying:
>
> [2018-01-15 09:45:41.066914] I [MSGID: 109063]
> [dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies in
> (null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1 overlaps=0
> [2018-01-15 09:45:45.755021] I [MSGID: 109063]
> [dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies in
> (null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1 overlaps=0
> [2018-01-15 14:02:29.171437] I [MSGID: 109063]
> [dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies in
> (null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1 overlaps=0
>
> What do they mean ? Is there any real problem ?
>
>
Please provide the following details:
gluster volume info
what clients you are using and what operations being performed
Any steps to reproduce this issue.

Thanks,
Nithya

Thank you,
>
>
> --
> Ing. Luca Lazzeroni
> Responsabile Ricerca e Sviluppo
> Trend Servizi Srl
> Tel: 0376/631761
> Web: https://www.trendservizi.it
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://lists.gluster.org/mailman/listinfo/gluster-users
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.gluster.org/pipermail/gluster-users/attachments/20180117/f39418ff/attachment.html>

Here's the volume info:


Volume Name: gv2a2
Type: Replicate
Volume ID: 83c84774-2068-4bfc-b0b9-3e6b93705b9f
Status: Started
Snapshot Count: 0
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: gluster1:/bricks/brick2/gv2a2
Brick2: gluster3:/bricks/brick3/gv2a2
Brick3: gluster2:/bricks/arbiter_brick_gv2a2/gv2a2 (arbiter)
Options Reconfigured:
storage.owner-gid: 107
storage.owner-uid: 107
user.cifs: off
features.shard: on
cluster.shd-wait-qlength: 10000
cluster.shd-max-threads: 8
cluster.locking-scheme: granular
cluster.data-self-heal-algorithm: full
cluster.server-quorum-type: server
cluster.quorum-type: auto
cluster.eager-lock: enable
network.remote-dio: enable
performance.low-prio-threads: 32
performance.io-cache: off
performance.read-ahead: off
performance.quick-read: off
transport.address-family: inet
nfs.disable: off
performance.client-io-threads: off

The only client I'm using is FUSE client used to mount the gluster 
volume. On the gluster volume there is a maximum of 15 files ("big" 
files because they host VM images) accessed by qemu-kvm as normal files 
on the FUSE mounted volume.

By inspecting the code I've found that the message is logged in 2 
situations:

1) A real "Hole" in DHT

2) A "virgin" file being created

I think this is the second situation because that message appears only 
when I create a new qcow2 volume to host VM image.



Il 17/01/2018 04:54, Nithya Balachandran ha scritto:
> Hi,
>
>
> On 16 January 2018 at 18:56, Ing. Luca Lazzeroni - Trend Servizi Srl 
> <luca at trendservizi.it <mailto:luca at trendservizi.it>>
wrote:
>
>     Hi,
>
>     I'm testing gluster 3.12.4 and, by inspecting log files
>     /var/log/glusterfs/mnt-gv0.log (gv0 is the volume name), I found
>     many lines saying:
>
>     [2018-01-15 09:45:41.066914] I [MSGID: 109063]
>     [dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies
>     in (null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1
>     overlaps=0
>     [2018-01-15 09:45:45.755021] I [MSGID: 109063]
>     [dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies
>     in (null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1
>     overlaps=0
>     [2018-01-15 14:02:29.171437] I [MSGID: 109063]
>     [dht-layout.c:716:dht_layout_normalize] 0-gv0-dht: Found anomalies
>     in (null) (gfid = 00000000-0000-0000-0000-000000000000). Holes=1
>     overlaps=0
>
>     What do they mean ? Is there any real problem ?
>
>
> Please provide the following details:
> gluster volume info
> what clients you are using and what operations being performed
> Any steps to reproduce this issue.
>
> Thanks,
> Nithya
>
>     Thank you,
>
>
>     -- 
>     Ing. Luca Lazzeroni
>     Responsabile Ricerca e Sviluppo
>     Trend Servizi Srl
>     Tel: 0376/631761
>     Web: https://www.trendservizi.it
>
>     _______________________________________________
>     Gluster-users mailing list
>     Gluster-users at gluster.org <mailto:Gluster-users at
gluster.org>
>     http://lists.gluster.org/mailman/listinfo/gluster-users
>     <http://lists.gluster.org/mailman/listinfo/gluster-users>
>
>
-- 
Ing. Luca Lazzeroni
Responsabile Ricerca e Sviluppo
Trend Servizi Srl
Tel: 0376/631761
Web: https://www.trendservizi.it

-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.gluster.org/pipermail/gluster-users/attachments/20180117/7bed7eae/attachment.html>