[Gluster-devel] [RFC] What if client fuse process crash?

[Ravishankar N]

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.
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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