[Gluster-devel] Adding one variable to inode structure

[Pranith Kumar Karampuri]

On Mon, Jun 5, 2017 at 12:40 PM, Tahereh Fattahi <t28.fattahi at gmail.com>
wrote:

> yes you are correct.
> I thought that for creating a video file i first should do a getfattr, if
> it was not set then I should do a setxattr.
> So it would be have bad performance to do a getfattr after every create,
> for video files. Am I correct?
>

How consistent should it be? May be you can do this operation on another
thread or something in the background so that your application may not see
the delay in doing I/O?


>
> On Mon, Jun 5, 2017 at 11:28 AM, Pranith Kumar Karampuri <
> pkarampu at redhat.com> wrote:
>
>> Oh you want applications to do getfattr to find that it is there?
>>
>> I think I understood what you are looking for now. So basically
>> applications will keep doing creation of some files/directories, whenever a
>> video file is created you want the bricks to set an extended attribute on
>> the directory, so that the application can use it. I don't think this
>> doesn't look like the job of index xlator either.
>>
>> Why do you not want to set the extended attribute from client and want
>> the fs to do it on-behalf of the application? Setting it from client has
>> benefits like even when one brick is down it will automatically heal this
>> extended attribute etc.
>>
>> On Mon, Jun 5, 2017 at 12:10 PM, Tahereh Fattahi <t28.fattahi at gmail.com>
>> wrote:
>>
>>> I want in in mount directory in client side
>>>
>>> On Mon, Jun 5, 2017 at 11:07 AM, Pranith Kumar Karampuri <
>>> pkarampu at redhat.com> wrote:
>>>
>>>>
>>>>
>>>> On Mon, Jun 5, 2017 at 11:24 AM, Tahereh Fattahi <t28.fattahi at gmail.com
>>>> > wrote:
>>>>
>>>>> Thank you
>>>>> I see that this xlator is loaded in server side.
>>>>> How can I access to variable in index xlator in client side?
>>>>> is it correct? getfattr trusted.index.myvar
>>>>>
>>>>
>>>> To which xlator do you want this information? Or do you want this on
>>>> mount?
>>>>
>>>>
>>>>>
>>>>> On Mon, Jun 5, 2017 at 10:00 AM, Pranith Kumar Karampuri <
>>>>> pkarampu at redhat.com> wrote:
>>>>>
>>>>>>
>>>>>>
>>>>>> On Mon, Jun 5, 2017 at 9:55 AM, Tahereh Fattahi <
>>>>>> t28.fattahi at gmail.com> wrote:
>>>>>>
>>>>>>> Assume that one client wants to search it's directories for video
>>>>>>> files.
>>>>>>>  I want use something that helps this client to search just
>>>>>>> directories that have this kind of file.
>>>>>>> like a extended attribute, but I want this attribute be set by
>>>>>>> server not by client.
>>>>>>> I dont know which xlator is suitable for this work.
>>>>>>>
>>>>>>
>>>>>> The xlator that comes close to it is:  index xlator
>>>>>> xlators/features/index/src
>>>>>>
>>>>>> You may have to track extra operations like
>>>>>> create/mknod/link/rename/unlink to make sure you get the
>>>>>> functionality you want. Basically this xlator helps you in indexing a
>>>>>> behavior. We use this for indexing directories/files that need heal etc.
>>>>>>
>>>>>>
>>>>>>>
>>>>>>> On Mon, Jun 5, 2017 at 7:13 AM, Pranith Kumar Karampuri <
>>>>>>> pkarampu at redhat.com> wrote:
>>>>>>>
>>>>>>>> This sounds hacky. In general anything that is specific about an
>>>>>>>> inode, we try to store it in inode-ctx. Who uses this information about
>>>>>>>> presence of video-file and how? May be with that knowledge there could be a
>>>>>>>> possibility we can improve the solution. Do let us know the complete
>>>>>>>> problem you are trying to solve.
>>>>>>>>
>>>>>>>> On Mon, Jun 5, 2017 at 4:53 AM, Tahereh Fattahi <
>>>>>>>> t28.fattahi at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Hi
>>>>>>>>> I want to add one boolean field to inode structure for a directory.
>>>>>>>>>  when it is 1 it means that directory has one or more video file.
>>>>>>>>> when it is 0 it means that there is no video file in that directory.
>>>>>>>>> I can add this variable to inode structure and update it in server
>>>>>>>>> side, in posix_create function (when there is a create request for a video
>>>>>>>>> file).
>>>>>>>>> question is about client knowledge about this variable. is it
>>>>>>>>> possible that client can see the amount of this variable of different
>>>>>>>>> servers (bricks) and OR them to one variable in cient's inode of the
>>>>>>>>> directory? in which xlator I should try in client side?
>>>>>>>>>
>>>>>>>>> _______________________________________________
>>>>>>>>> Gluster-devel mailing list
>>>>>>>>> Gluster-devel at gluster.org
>>>>>>>>> http://lists.gluster.org/mailman/listinfo/gluster-devel
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Pranith
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>> --
>>>>>> Pranith
>>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>> --
>>>> Pranith
>>>>
>>>
>>>
>>
>>
>> --
>> Pranith
>>
>
>


-- 
Pranith
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