[Gluster-users] set volume locking without shutting off server

[Jordan R. Willis]

  HI Niels and Company,


It feels like I’m spamming so I want to apologize. It seems I spoke a little too soon. It turns out I was able to lock as long as I mounted my gluster volume using glusterfs rather than nfs. I was just on the daemon server that had mounted glusterfs using:


>glusterfsserver
$mount -t glusterfs glusterfsserver:/my_volume /mnt/my_mount
#locking works




>random_client
$mount -t nfs glusterfserver:/my_volume /mnt/my_other_mount
#locking doesn’t work


This just shows me another reason to install glusterfs on all my servers and mount using glusterfs rather than nfs. But I wanted to make sure that this behavior of not being able to lock is consistent in case any other users need to know.


- Jordan


> On Jul 5, 2015, at 3:23 AM, Niels de Vos <ndevos at redhat.com> wrote:
> 
> 
> On Sat, Jul 04, 2015 at 08:10:48PM -0700, Jordan Willis wrote:
> 
> 
>> Looks like upgrading to the latest version of glusterfs solved all my
>> locking issues. 
>> 
>> 
>> 
> 
> 
> Thanks for reporting back.
> 
> 
> I'm not aware of any changes related to locking since 3.5.2 (was it?).
> That makes it difficult to guess what the problem caused and why it
> works fine with an updated version.
> 
> 
> Have a good weekend,
> Niels
> 
> 
>> 
>> 
>> 
>> Thank you,
>> Jordan
>> 
>> 
>>> On Jul 4, 2015, at 3:22 AM, Jordan Willis <jwillis0720 at gmail.com> wrote:
>>> 
>>> 
>>> Its not just sqlite, but mongodb and ipython notebook. If you have a solution for mongodb file locking, I’m welcome to suggestions. But not using mongodb, is not an option. 
>>> 
>>> 
>>>> On Jul 4, 2015, at 2:57 AM, Niels de Vos <ndevos at redhat.com> wrote:
>>>> 
>>>> 
>>>> On Fri, Jul 03, 2015 at 06:46:01PM -0700, Jordan Willis wrote:
>>>> 
>>>> 
>>>>> Hi,
>>>>> 
>>>>> 
>>>>> Is it possible to enable posix type locking with glusterfs without
>>>>> shutting off the volume?
>>>>> 
>>>>> 
>>>>> 
>>>> 
>>>> 
>>>> Locking should be enabled by default (like Kaushal explained in an other
>>>> reply).
>>>> 
>>>> 
>>>>> I think this is what I need (I’m trying to get sqlite to lock files on
>>>>> my nfs mounted glusterfs volume)
>>>>> 
>>>>> 
>>>>> 
>>>> 
>>>> 
>>>> SQLite is not the best databases to place on a shared filesystem. The
>>>> locking done by SQLite is (or at least was, might have changed) not very
>>>> advanced. From what I remember, there is a single file lock, no table or
>>>> row granularity.
>>>> 
>>>> 
>>>> https://www.sqlite.org/pragma.html#pragma_locking_mode contains some
>>>> more details, and it also points to the WAL documentation. You will want
>>>> to prevent SQLite to use shared-memory for WAL if you access the
>>>> database from different servers at the same time.
>>>> 
>>>> 
>>>> HTH,
>>>> Niels
>>>> 
>>>> 
>>>> 
>>> 
>>> 
>>> 
>> 
>> 
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