[Bugs] [Bug 1297280] tar on a glusterfs mount displays " file changed as we read it" even though the file was not changed

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1297280

Arie Skliarouk <skliarie+redhat-bugzilla at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |skliarie+redhat-bugzilla at gm
                   |                            |ail.com



--- Comment #17 from Arie Skliarouk <skliarie+redhat-bugzilla at gmail.com> ---
The bug is still relevant on glusterfs 3.13 (as shipped in ubuntu PPA).

I traced it to different timestamps of file replicas (it looks like glusterfs
returns timestamp of the real file from local node):

stat on the first replica:

root at tframe0-atl:~# stat
/mnt/opsfs/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz
/mnt/opsfs-tf0/BRICK/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz 
  File: '/mnt/opsfs/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz'
  Size: 19090142        Blocks: 37286      IO Block: 131072 regular file
Device: 8ah/138d        Inode: 9964002487893152032  Links: 1
Access: (0664/-rw-rw-r--)  Uid: (  999/     ops)   Gid: (  999/     ops)
Access: 2018-08-13 00:00:03.059002452 +0000
Modify: 2018-07-06 13:28:10.768794322 +0000
Change: 2018-07-06 13:28:14.340859975 +0000
 Birth: -
  File: '/mnt/opsfs-tf0/BRICK/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz'
  Size: 19090142        Blocks: 37296      IO Block: 4096   regular file
Device: fc02h/64514d    Inode: 1187765     Links: 2
Access: (0664/-rw-rw-r--)  Uid: (  999/     ops)   Gid: (  999/     ops)
Access: 2018-08-13 00:00:03.059002452 +0000
Modify: 2018-07-06 13:28:10.768794322 +0000
Change: 2018-07-06 13:28:14.340859975 +0000
 Birth: -

stat on the second replica:

root at tframe1-atl:~# stat
/mnt/opsfs/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz
/mnt/opsfs-tf0/BRICK/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz 
  File: '/mnt/opsfs/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz'
  Size: 19090142        Blocks: 37286      IO Block: 131072 regular file
Device: b8h/184d        Inode: 9964002487893152032  Links: 1
Access: (0664/-rw-rw-r--)  Uid: (  999/     ops)   Gid: (  999/     ops)
Access: 2018-07-06 13:28:07.736870120 +0000
Modify: 2018-07-06 13:28:10.768794322 +0000
Change: 2018-07-06 13:28:14.340980075 +0000
 Birth: -
stat: cannot stat
'/mnt/opsfs-tf0/BRICK/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz': No such
file or directory
root at tframe1-atl:~# stat
/mnt/opsfs/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz
/mnt/opsfs-tf1/BRICK/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz 
  File: '/mnt/opsfs/db/CMTS/CMTS_MnB-101824/CMTS_MnB-101824.tar.gz'
  Size: 19090142        Blocks: 37286      IO Block: 131072 regular file
Device: b8h/184d        Inode: 9964002487893152032  Links: 1
Access: (0664/-rw-rw-r--)  Uid: (  999/     ops)   Gid: (  999/     ops)
Access: 2018-07-06 13:28:07.736870120 +0000
Modify: 2018-07-06 13:28:10.768794322 +0000
Change: 2018-07-06 13:28:14.340980075 +0000
 Birth: -

After I reset timestamp of real file to be the same, the tar stopped
complaining.

IMHO, glusterfs must self-heal the timestamp in such cases.

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