GNU bug report logs - #31184
tail -f on Network FS not refreshing as soon as the file is changed.

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From: Jewsco Pius Jacquez <JewscoPius.Jacquez <at> Amdocs.com>
To: Erik Auerswald <auerswal <at> unix-ag.uni-kl.de>
Cc: "31184 <at> debbugs.gnu.org" <31184 <at> debbugs.gnu.org>, Pádraig Brady <P <at> draigBrady.com>
Subject: bug#31184: tail -f on Network FS not refreshing as soon as the file is changed.
Date: Tue, 17 Apr 2018 18:18:39 +0000

Yes, it didn't work either.

The closest is this one(below), but still the update is every second only.
# tail --follow=name --max-unchanged-stats=1 --sleep-interval=1  /media/samba/test.file


Thanks,
Jewsco

-----Original Message-----
From: Erik Auerswald [mailto:auerswal <at> unix-ag.uni-kl.de] 
Sent: Tuesday, April 17, 2018 11:06 AM
To: Jewsco Pius Jacquez <JewscoPius.Jacquez <at> Amdocs.com>
Cc: Pádraig Brady <P <at> draigBrady.com>; 31184 <at> debbugs.gnu.org
Subject: Re: bug#31184: tail -f on Network FS not refreshing as soon as the file is changed.

Hi Jewsco,

did you already try the -F option instead of -f?

Thanks,
Erik

On Tue, Apr 17, 2018 at 03:46:27PM +0000, Jewsco Pius Jacquez wrote:
> Padraig, thanks for your response,
> 
> The ---disable-inotify didn't refresh either.
> 
> [root <at> cmilsbtest03 ~]# stat -f -c '%t %T'  /media/samba/test.file
> ff534d42 cifs
> [root <at> cmilsbtest03 ~]# df -h /media/samba/test.file
> Filesystem            Size  Used Avail Use% Mounted on
> //10.124.61.52/finance
>                        14G   13G  1.6G  89% /media/samba
> [root <at> cmilsbtest03 ~]# grep /media/samba /proc/mounts 
> //10.124.61.52/finance/ /media/samba cifs 
> rw,relatime,sec=ntlm,cache=loose,unc=\134\13410.124.61.52\134finance,u
> sername=,uid=0,noforceuid,gid=0,noforcegid,addr=10.124.61.52,unix,posi
> xpaths,serverino,acl,rsize=1048576,wsize=65536,echo_interval=60,actime
> o=1 0 0
> [root <at> cmilsbtest03 ~]#
> 
> 
> Thanks,
> Jewsco
> 
> 
> -----Original Message-----
> From: Pádraig Brady [mailto:P <at> draigBrady.com]
> Sent: Tuesday, April 17, 2018 2:29 AM
> To: Jewsco Pius Jacquez <JewscoPius.Jacquez <at> Amdocs.com>; 
> 31184 <at> debbugs.gnu.org
> Subject: Re: bug#31184: tail -f on Network FS not refreshing as soon as the file is changed.
> 
> On 16/04/18 10:11, Jewsco Pius Jacquez wrote:
> > Hello,
> > 
> > We have a legacy application that is using tail -f command in the application and is running in Redhat 9 under a shared Samba filesystem.
> > 
> > We want to migrate the application to RHEL7 and we noticed that the tail -f command here is not refreshing as soon as the file get changed. In Redhat 9, it is working fine, every write on the file got reflected straight away(no waiting interval).
> > 
> > Is there a way that we can make the tail -f working as it was in Redhat 9? For this reason, we are not able to migrate our Legacy application.
> 
> To get around the issue, the undocumented ---disable-inotify option 
> may help (note the three dashes)
> 
> If that does help then there is an issue with the misdetection of a known file system as local, when it should be treated as remote.
> Can you show the file system type for the file you're trying to tail, using:
> 
>   stat -f -c '%t %T' /path/to/your/file
> 
> cheers,
> Pádraig
> This message and the information contained herein is proprietary and 
> confidential and subject to the Amdocs policy statement,
> 
> you may review at https://www.amdocs.com/about/email-disclaimer 
> <https://www.amdocs.com/about/email-disclaimer>
> 
> 
> 
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