[Gluster-devel] Coverity covscan for 2018-02-08-5e751b4c (master branch)

[staticanalysis]

GlusterFS Coverity covscan results are available from
http://download.gluster.org/pub/gluster/glusterfs/static-analysis/master/glusterfs-coverity/2018-02-08-5e751b4c
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Re: [Gluster-devel] query about a split-brain problem found in glusterfs3.12.3

[Ravishankar N]

On 02/08/2018 01:08 PM, Zhou, Cynthia (NSB - CN/Hangzhou) wrote:


Hi,

I check the link you provided. It does not mention the the “dirty” 
attribute, if I try to fix this split-brain by manually setfattr 
command, should I only set the “trusted.afr.export-client-0” command?


Manually resetting xattrs is not recommended. Use the gluster CLI to 
resolve it.


By the way, I feel it is quite strange that the output of “gluster 
volume heal export info” command there is two entries with the same 
name, how does this happen?


Maybe the same entry is listed in different subfolders of 
.glusterfs/indices?


gluster volume heal export info
Brick sn-0.local:/mnt/bricks/export/brick
Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick
/testdir - Is in split-brain

/testdir - Possibly undergoing heal

Status: Connected
Number of entries: 2

I also do some other test, when sn-0 side file/dir does not has 
“dirty” and “trusted.afr.export-client-*” attribute and sn-1 side 
file/dir has both “dirty” and “trusted.afr.export-client-*” non-zero. 
The gluster could self heal such scenario. But in this case the it 
could never self heal.


*From:*Ravishankar N [mailto:ravishan...@redhat.com]
*Sent:* Thursday, February 08, 2018 11:56 AM
*To:* Zhou, Cynthia (NSB - CN/Hangzhou) 
; Gluster-devel@gluster.org

*Subject:* Re: query about a split-brain problem found in glusterfs3.12.3

On 02/08/2018 07:16 AM, Zhou, Cynthia (NSB - CN/Hangzhou) wrote:

Hi,

Thanks for responding?

If split-brain happen in such kind of test is reasonable, how to
fix this split-brain situation?

If you are using replica 2, then there is no prevention. Once they 
occur, you can resolve them using 
http://docs.gluster.org/en/latest/Troubleshooting/resolving-splitbrain/


If you want to prevent split-brain, you would need to use replica 3 or 
arbiter volume.


Regards,
Ravi

*From:*Ravishankar N [mailto:ravishan...@redhat.com]
*Sent:* Thursday, February 08, 2018 12:12 AM
*To:* Zhou, Cynthia (NSB - CN/Hangzhou)

; Gluster-devel@gluster.org

*Subject:* Re: query about a split-brain problem found in
glusterfs3.12.3

On 02/07/2018 10:39 AM, Zhou, Cynthia (NSB - CN/Hangzhou) wrote:

Hi glusterfs expert:

Good day.

Lately, we meet a glusterfs split brain problem in our env in
/mnt/export/testdir. We start 3 ior process (IOR tool) from
non-sn nodes, which is creating/removing files repeatedly in
testdir. then we reboot sn nodes(sn0 and sn1) by sequence.
Then we meet following problem.

Do you have some comments on how this could happen? And how to
fix it in this situation? Thanks!


Is the problem that split-brain is happening? Is this a replica 2
volume? If yes, then it looks like it is expected behavior?
Regards
Ravi


gluster volume heal export info
Brick sn-0.local:/mnt/bricks/export/brick
Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick
/testdir - Is in split-brain

/testdir - Possibly undergoing heal

Status: Connected
Number of entries: 2

wait for a while …..

gluster volume heal export info
Brick sn-0.local:/mnt/bricks/export/brick
Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick
/testdir - Possibly undergoing heal

/testdir - Possibly undergoing heal

and finally:

[root@sn-0:/root ]
# gluster v heal export info
Brick sn-0.local:/mnt/bricks/export/brick

Status: Connected
Number of entries: 0

Brick sn-1.local:/mnt/bricks/export/brick

/testdir - Is in split-brain

Status: Connected
Number of entries: 1

[root@sn-0:/root ]

# getfattr -m .* -d -e  hex /mnt/bricks/export/brick/testdir

getfattr: Removing leading '/' from absolute path names

# file: mnt/bricks/export/brick/testdir

trusted.gfid=0x5622cff893b3484dbdb6a20a0edb0e77

trusted.glusterfs.dht=0x0001

[root@sn-1:/root ]

# getfattr -m .* -d -e  hex /mnt/bricks/export/brick/testdir

getfattr: Removing leading '/' from absolute path names

# file: mnt/bricks/export/brick/testdir

trusted.afr.dirty=0x0001

trusted.afr.export-client-0=0x0038

trusted.gfid=0x5622cff893b3484dbdb6a20a0edb0e77

trusted.glusterfs.dht=0x0001



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Re: [Gluster-devel] Test case failure

[Vaibhav Vaingankar]

Hi Jiffin,

Thank you for your kind attention in this matter.

I am building Glusterfs v3.12.3
Please find the log file in the attachments.

(See attached file: mount-nfs-auth.tar)

Thanks and regards,
Vaibhav Vaingankar



From:   Jiffin Tony Thottan 
To: Vaibhav Vaingankar ,
gluster-devel@gluster.org
Date:   08-02-18 09:48
Subject:Re: [Gluster-devel] Test case failure



Hi Vaibhav,



On Wednesday 07 February 2018 02:28 PM, Vaibhav Vaingankar wrote:


  Hi,

  I am building GlusterFS from source on my machine. Build is
  successful, one test case if failing while testing. Test "
  tests/basic/mount-nfs-auth.t" seen repeatedly failing.
  following are the details of environment setup I have done:


apt-get install make automake autoconf libtool flex bison
pkg-config libssl-dev libxml2-dev python-dev libaio-dev
libibverbs-dev librdmacm-dev libreadline-dev liblvm2-dev
libglib2.0-dev liburcu-dev libcmocka-dev libsqlite3-dev
libacl1-dev wget tar dbench git xfsprogs attr nfs-common
yajl-tools sqlite3 libxml2-utils thin-provisioning-tools bc

  Also, I have configured with "--enable-gnfs".

  So is this known failure or is it a environment specific issue?

  Please do let me know if I am missing something here.

Can u please proivde output of the test which ran and u will get logs in
archived log"moun-nfs-auth.tar" in /var/log/glusterfs (i hope u are running
version above 3.8) please that as well.

--

Jiffin


  Thanks and regards,
  Vaibhav Vaingankar


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mount-nfs-auth.tar
Description: Binary data
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