On 2019/8/6 2:57 下午, Ravishankar N wrote:
On 06/08/19 11:44 AM, Changwei Ge wrote:
Hi Ravishankar,
Thanks for your share, it's very useful to me.
I am setting up a glusterfs storage cluster recently and the
umount/mount recovering process bothered me.
Hi Changwei,
Why are you needing to do frequent remounts? If your gluster fuse
client is crashing frequently, that should be investigated and fixed.
If you have a reproducer, please raise a bug with all the details like
the glusterfs version, core files and log files.
Hi Ravi,
Actually, glusterfs client fuse process ran well in my environment. But
high-availability and fault-tolerance are also my big concerns.
So I killed the fuse process to see what would happen. AFAIK, userspace
processes are likely to be killed or crashed somehow, which is not under
our control. :-(
Another scenario is *software upgrade*. Since we have to upgrade
glusterfs client version in order to enrich features and fix bugs. It
will be friendly to applications if the upgrade is transparent.
Thanks,
Changwei
Regards,
Ravi
I happened to find some patches[1] from internet aiming to address
such a problem but no idea why they were not managed to merge into
glusterfs mainline.
Do you know why?
Thanks,
Changwei
[1]:
https://review.gluster.org/#/c/glusterfs/+/16843/
https://github.com/gluster/glusterfs/issues/242
On 2019/8/6 1:12 下午, Ravishankar N wrote:
On 05/08/19 3:31 PM, Changwei Ge wrote:
Hi list,
If somehow, glusterfs client fuse process dies. All subsequent file
operations will be failed with error 'no connection'.
I am curious if the only way to recover is umount and mount again?
Yes, this is pretty much the case with all fuse based file systems.
You can use -o auto_unmount (https://review.gluster.org/#/c/17230/)
to automatically cleanup and not having to manually unmount.
If so, that means all processes working on top of glusterfs have to
close files, which sometimes is hard to be acceptable.
There is
https://research.cs.wisc.edu/wind/Publications/refuse-eurosys11.html,
which claims to provide a framework for transparent failovers. I
can't find any publicly available code though.
Regards,
Ravi
Thanks,
Changwei
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