Re: [Gluster-users] gfid generation

2016-11-15 Thread Pranith Kumar Karampuri 
On Wed, Nov 16, 2016 at 3:31 AM, Ankireddypalle Reddy <are...@commvault.com>
wrote:

> Kaushal/Pranith,
>   Thanks for clarifying this. As I
> understand there are 2 id's. Please correct if there is a mistake in my
> assumptions:
>   1) HASH generated by DHT and this will
> generate the same id for a given file all the time.
>   2) GFID which is an version 4 UUID. As
> per the below links this is supposed to contain a time stamp field in it.
> So this will not generate the same id for a given file all the time.
>https://en.wikipedia.org/wiki/
> Universally_unique_identifier
>https://tools.ietf.org/html/rfc4122


That is correct. There is no involvement of parent gfid in either of this
:-).


>
>
> Thanks and Regards,
> ram
> -Original Message-
> From: Kaushal M [mailto:kshlms...@gmail.com]
> Sent: Tuesday, November 15, 2016 1:21 PM
> To: Ankireddypalle Reddy
> Cc: Pranith Kumar Karampuri; gluster-users@gluster.org; Gluster Devel
> Subject: Re: [Gluster-users] gfid generation
>
> On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy <
> are...@commvault.com> wrote:
> > Pranith,
> >
> >  Thanks for getting back on this. I am trying to see
> > how gfid can be generated programmatically. Given a file name how do
> > we generate gfid for it. I was reading some of the email threads about
> > it where it was mentioned that gfid is generated based upon parent
> > directory gfid and the file name. Given a same parent gfid and file
> > name do we always end up with the same gfid.
>
> You're probably confusing the hash as generated for the elastic hash
> algorithm in DHT, with UUID. That is a combination of
>
> I always thought that the GFID was a UUID, which was randomly generated.
> (The random UUID might be being modified a little to allow some leeway with
> directory listing, IIRC).
>
> Adding gluster-devel to get more eyes on this.
>
> >
> >
> >
> > Thanks and Regards,
> >
> > ram
> >
> >
> >
> > From: Pranith Kumar Karampuri [mailto:pkara...@redhat.com]
> > Sent: Tuesday, November 15, 2016 12:58 PM
> > To: Ankireddypalle Reddy
> > Cc: gluster-users@gluster.org
> > Subject: Re: [Gluster-users] gfid generation
> >
> >
> >
> > Sorry, didn't understand the question. Are you saying give a file on
> > gluster how to get gfid of the file?
> >
> > #getfattr -d -m. -e hex /path/to/file shows it
> >
> >
> >
> > On Fri, Nov 11, 2016 at 9:47 PM, Ankireddypalle Reddy
> > <are...@commvault.com>
> > wrote:
> >
> > Hi,
> >
> > Is the mapping from file name to gfid an idempotent operation.
> > If so please point me to the function that does this.
> >
> >
> >
> > Thanks and Regards,
> >
> > Ram
> >
> > ***Legal Disclaimer***
> >
> > "This communication may contain confidential and privileged material
> > for the
> >
> > sole use of the intended recipient. Any unauthorized review, use or
> > distribution
> >
> > by others is strictly prohibited. If you have received the message by
> > mistake,
> >
> > please advise the sender by reply email and delete the message. Thank
> you."
> >
> > **
> >
> >
> > ___
> > Gluster-users mailing list
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> > http://www.gluster.org/mailman/listinfo/gluster-users
> >
> >
> >
> >
> > --
> >
> > Pranith
> >
> > ***Legal Disclaimer***
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> > for the sole use of the intended recipient. Any unauthorized review,
> > use or distribution by others is strictly prohibited. If you have
> > received the message by mistake, please advise the sender by reply
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>



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Re: [Gluster-users] gfid generation

2016-11-15 Thread Ankireddypalle Reddy 
Kaushal/Pranith,
  Thanks for clarifying this. As I understand 
there are 2 id's. Please correct if there is a mistake in my assumptions:
  1) HASH generated by DHT and this will 
generate the same id for a given file all the time.
  2) GFID which is an version 4 UUID. As per 
the below links this is supposed to contain a time stamp field in it.  So this 
will not generate the same id for a given file all the time.
   
https://en.wikipedia.org/wiki/Universally_unique_identifier
   https://tools.ietf.org/html/rfc4122
 
Thanks and Regards,
ram
-Original Message-
From: Kaushal M [mailto:kshlms...@gmail.com] 
Sent: Tuesday, November 15, 2016 1:21 PM
To: Ankireddypalle Reddy
Cc: Pranith Kumar Karampuri; gluster-users@gluster.org; Gluster Devel
Subject: Re: [Gluster-users] gfid generation

On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy <are...@commvault.com> 
wrote:
> Pranith,
>
>  Thanks for getting back on this. I am trying to see 
> how gfid can be generated programmatically. Given a file name how do 
> we generate gfid for it. I was reading some of the email threads about 
> it where it was mentioned that gfid is generated based upon parent 
> directory gfid and the file name. Given a same parent gfid and file 
> name do we always end up with the same gfid.

You're probably confusing the hash as generated for the elastic hash algorithm 
in DHT, with UUID. That is a combination of

I always thought that the GFID was a UUID, which was randomly generated. (The 
random UUID might be being modified a little to allow some leeway with 
directory listing, IIRC).

Adding gluster-devel to get more eyes on this.

>
>
>
> Thanks and Regards,
>
> ram
>
>
>
> From: Pranith Kumar Karampuri [mailto:pkara...@redhat.com]
> Sent: Tuesday, November 15, 2016 12:58 PM
> To: Ankireddypalle Reddy
> Cc: gluster-users@gluster.org
> Subject: Re: [Gluster-users] gfid generation
>
>
>
> Sorry, didn't understand the question. Are you saying give a file on 
> gluster how to get gfid of the file?
>
> #getfattr -d -m. -e hex /path/to/file shows it
>
>
>
> On Fri, Nov 11, 2016 at 9:47 PM, Ankireddypalle Reddy 
> <are...@commvault.com>
> wrote:
>
> Hi,
>
> Is the mapping from file name to gfid an idempotent operation.  
> If so please point me to the function that does this.
>
>
>
> Thanks and Regards,
>
> Ram
>
> ***Legal Disclaimer***
>
> "This communication may contain confidential and privileged material 
> for the
>
> sole use of the intended recipient. Any unauthorized review, use or 
> distribution
>
> by others is strictly prohibited. If you have received the message by 
> mistake,
>
> please advise the sender by reply email and delete the message. Thank you."
>
> **
>
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>
>
>
>
> --
>
> Pranith
>
> ***Legal Disclaimer***
> "This communication may contain confidential and privileged material 
> for the sole use of the intended recipient. Any unauthorized review, 
> use or distribution by others is strictly prohibited. If you have 
> received the message by mistake, please advise the sender by reply 
> email and delete the message. Thank you."
> **
>
> ___
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> http://www.gluster.org/mailman/listinfo/gluster-users
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Re: [Gluster-users] gfid generation

2016-11-15 Thread Pranith Kumar Karampuri 
On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy <are...@commvault.com
> wrote:

> Pranith,
>
>  Thanks for getting back on this. I am trying to see how
> gfid can be generated programmatically. Given a file name how do we
> generate gfid for it. I was reading some of the email threads about it
> where it was mentioned that gfid is generated based upon parent directory
> gfid and the file name. Given a same parent gfid and file name do we always
> end up with the same gfid.
>

No, gfid is a UUID, so there is correlation.
https://en.wikipedia.org/wiki/Universally_unique_identifier can help you I
guess. Where did you see the above information that Parent gfid and name
are involved?

PS: These kinds of mails people in gluster-devel are more suited to answer
IMO.


>
> Thanks and Regards,
>
> ram
>
>
>
> *From:* Pranith Kumar Karampuri [mailto:pkara...@redhat.com]
> *Sent:* Tuesday, November 15, 2016 12:58 PM
> *To:* Ankireddypalle Reddy
> *Cc:* gluster-users@gluster.org
> *Subject:* Re: [Gluster-users] gfid generation
>
>
>
> Sorry, didn't understand the question. Are you saying give a file on
> gluster how to get gfid of the file?
>
> #getfattr -d -m. -e hex /path/to/file shows it
>
>
>
> On Fri, Nov 11, 2016 at 9:47 PM, Ankireddypalle Reddy <
> are...@commvault.com> wrote:
>
> Hi,
>
> Is the mapping from file name to gfid an idempotent operation.  If
> so please point me to the function that does this.
>
>
>
> Thanks and Regards,
>
> Ram
>
> ***Legal Disclaimer***
>
> "This communication may contain confidential and privileged material for
> the
>
> sole use of the intended recipient. Any unauthorized review, use or
> distribution
>
> by others is strictly prohibited. If you have received the message by
> mistake,
>
> please advise the sender by reply email and delete the message. Thank you."
>
> **
>
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>
>
>
>
> --
>
> Pranith
> ***Legal Disclaimer***
> "This communication may contain confidential and privileged material for
> the
> sole use of the intended recipient. Any unauthorized review, use or
> distribution
> by others is strictly prohibited. If you have received the message by
> mistake,
> please advise the sender by reply email and delete the message. Thank you."
> **
>



-- 
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Re: [Gluster-users] gfid generation

2016-11-15 Thread Kaushal M 
On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy
<are...@commvault.com> wrote:
> Pranith,
>
>  Thanks for getting back on this. I am trying to see how
> gfid can be generated programmatically. Given a file name how do we generate
> gfid for it. I was reading some of the email threads about it where it was
> mentioned that gfid is generated based upon parent directory gfid and the
> file name. Given a same parent gfid and file name do we always end up with
> the same gfid.

You're probably confusing the hash as generated for the elastic hash
algorithm in DHT, with UUID. That is a combination of

I always thought that the GFID was a UUID, which was randomly
generated. (The random UUID might be being modified a little to allow
some leeway with directory listing, IIRC).

Adding gluster-devel to get more eyes on this.

>
>
>
> Thanks and Regards,
>
> ram
>
>
>
> From: Pranith Kumar Karampuri [mailto:pkara...@redhat.com]
> Sent: Tuesday, November 15, 2016 12:58 PM
> To: Ankireddypalle Reddy
> Cc: gluster-users@gluster.org
> Subject: Re: [Gluster-users] gfid generation
>
>
>
> Sorry, didn't understand the question. Are you saying give a file on gluster
> how to get gfid of the file?
>
> #getfattr -d -m. -e hex /path/to/file shows it
>
>
>
> On Fri, Nov 11, 2016 at 9:47 PM, Ankireddypalle Reddy <are...@commvault.com>
> wrote:
>
> Hi,
>
> Is the mapping from file name to gfid an idempotent operation.  If
> so please point me to the function that does this.
>
>
>
> Thanks and Regards,
>
> Ram
>
> ***Legal Disclaimer***
>
> "This communication may contain confidential and privileged material for the
>
> sole use of the intended recipient. Any unauthorized review, use or
> distribution
>
> by others is strictly prohibited. If you have received the message by
> mistake,
>
> please advise the sender by reply email and delete the message. Thank you."
>
> **
>
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>
>
>
>
> --
>
> Pranith
>
> ***Legal Disclaimer***
> "This communication may contain confidential and privileged material for the
> sole use of the intended recipient. Any unauthorized review, use or
> distribution
> by others is strictly prohibited. If you have received the message by
> mistake,
> please advise the sender by reply email and delete the message. Thank you."
> **
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
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Re: [Gluster-users] gfid generation

2016-11-15 Thread Ankireddypalle Reddy 
Pranith,
 Thanks for getting back on this. I am trying to see how gfid 
can be generated programmatically. Given a file name how do we generate gfid 
for it. I was reading some of the email threads about it where it was mentioned 
that gfid is generated based upon parent directory gfid and the file name. 
Given a same parent gfid and file name do we always end up with the same gfid.

Thanks and Regards,
ram

From: Pranith Kumar Karampuri [mailto:pkara...@redhat.com]
Sent: Tuesday, November 15, 2016 12:58 PM
To: Ankireddypalle Reddy
Cc: gluster-users@gluster.org
Subject: Re: [Gluster-users] gfid generation

Sorry, didn't understand the question. Are you saying give a file on gluster 
how to get gfid of the file?
#getfattr -d -m. -e hex /path/to/file shows it

On Fri, Nov 11, 2016 at 9:47 PM, Ankireddypalle Reddy 
<are...@commvault.com<mailto:are...@commvault.com>> wrote:
Hi,
Is the mapping from file name to gfid an idempotent operation.  If so 
please point me to the function that does this.

Thanks and Regards,
Ram
***Legal Disclaimer***
"This communication may contain confidential and privileged material for the
sole use of the intended recipient. Any unauthorized review, use or distribution
by others is strictly prohibited. If you have received the message by mistake,
please advise the sender by reply email and delete the message. Thank you."
**

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Re: [Gluster-users] gfid generation

2016-11-15 Thread Pranith Kumar Karampuri 
Sorry, didn't understand the question. Are you saying give a file on
gluster how to get gfid of the file?
#getfattr -d -m. -e hex /path/to/file shows it

On Fri, Nov 11, 2016 at 9:47 PM, Ankireddypalle Reddy 
wrote:

> Hi,
>
> Is the mapping from file name to gfid an idempotent operation.  If
> so please point me to the function that does this.
>
>
>
> Thanks and Regards,
>
> Ram
> ***Legal Disclaimer***
> "This communication may contain confidential and privileged material for
> the
> sole use of the intended recipient. Any unauthorized review, use or
> distribution
> by others is strictly prohibited. If you have received the message by
> mistake,
> please advise the sender by reply email and delete the message. Thank you."
> **
>
> ___
> Gluster-users mailing list
> Gluster-users@gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users
>



-- 
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[Gluster-users] gfid generation

2016-11-11 Thread Ankireddypalle Reddy 
Hi,
Is the mapping from file name to gfid an idempotent operation.  If so 
please point me to the function that does this.

Thanks and Regards,
Ram
***Legal Disclaimer***
"This communication may contain confidential and privileged material for the
sole use of the intended recipient. Any unauthorized review, use or distribution
by others is strictly prohibited. If you have received the message by mistake,
please advise the sender by reply email and delete the message. Thank you."
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