[Gluster-users] Concurrent writes management.

[Pranith Kumar Karampuri]

On 07/03/2014 07:35 AM, Pranith Kumar Karampuri wrote:
>
> On 07/01/2014 12:58 PM, COCHE Sébastien wrote:
>>
>> Does it mean that if I use gluster FUSE driver or NFS client, fcntl 
>> locks are manages and no data corruption could happen ?
>>
> Yes.
To be more precise, Yes, if applications take appropriate locks.

Pranith
>
> Pranith
>>
>> *Sébastien Coché,*
>>
>> Architecte Infrastructure(DIP)
>>
>> SIGMA Informatique -- _www.sigma.fr <http://www.sigma.fr/>_
>>
>> 8 rue Newton -- CS 84533 -- 44245 LA CHAPELLE SUR ERDRE CEDEX
>>
>> Tél : (+33) 2.53.48.92.57-- Mob : 06 22 25 03 74
>>
>> *De :*Pranith Kumar Karampuri [mailto:pkarampu at redhat.com]
>> *Envoyé :* lundi 30 juin 2014 18:08
>> *À :* COCHE Sébastien
>> *Cc :* gluster-users at gluster.org
>> *Objet :* Re: [Gluster-users] Concurrent writes management.
>>
>> On 06/30/2014 09:26 PM, COCHE Sébastien wrote:
>>
>>     Thank you for your response.
>>
>>     I understand that the file exist only one time on the volume. But
>>     it can be accessed in write, by many nodes (clients) at the same
>>     time.
>>
>>     What's happen in those case ?
>>
>> Nothing bad will happen to the filesystem. But the file may not be 
>> meaningful if the applications writing to it don't synchronize 
>> overlapping concurrent writes with fcntl locks.
>>
>> Pranith
>>
>> *Sébastien Coché,*
>>
>> Architecte Infrastructure(DIP)
>>
>> SIGMA Informatique -- _www.sigma.fr <http://www.sigma.fr/>_
>>
>> 8 rue Newton -- CS 84533 -- 44245 LA CHAPELLE SUR ERDRE CEDEX
>>
>> Tél : (+33) 2.53.48.92.57-- Mob : 06 22 25 03 74
>>
>> *De :*Pranith Kumar Karampuri [mailto:pkarampu at redhat.com]
>> *Envoyé :* lundi 30 juin 2014 17:49
>> *À :* COCHE Sébastien; gluster-users at gluster.org 
>> <mailto:gluster-users at gluster.org>
>> *Objet :* Re: [Gluster-users] Concurrent writes management.
>>
>> On 06/30/2014 07:49 PM, COCHE Sébastien wrote:
>>
>>     Hello
>>
>>     I have a question regarding concurrent write.
>>
>>     How are manage those writes ? Is there a risk of data corruption ?
>>
>>     Is there a lock mechanism, against corruption ? If yes, how it work ?
>>
>>     I already had a look to forum and documents but I did not found a
>>     deep dive explanation.
>>
>> For plain distribute volumes there exists only one file in the volume 
>> with the data. All the operations on the file happen just like they 
>> happen on normal filesystem. For replicated/distributed replicated 
>> volumes there are internal locks taken by replication feature to 
>> avoid any in-consistencies.
>> Please check 
>> https://github.com/gluster/glusterfs/blob/master/doc/features/afr-v1.md 
>> to know more about it.
>>
>> Pranith
>>
>>
>> Thank for your feedback
>>
>> Sorry for my poor english  ;-)
>>
>> Sebastien
>>
>>
>>
>>
>>
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>

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