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:kshlmster@xxxxxxxxx]
Sent: Tuesday, November 15, 2016 1:21 PM
To: Ankireddypalle Reddy
Cc: Pranith Kumar Karampuri; gluster-users@xxxxxxxxxxx; Gluster Devel
Subject: Re: [Gluster-users] gfid generation
On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy <areddy@xxxxxxxxxxxxx> 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:pkarampu@xxxxxxxxxx]
> Sent: Tuesday, November 15, 2016 12:58 PM
> To: Ankireddypalle Reddy
> Cc: gluster-users@xxxxxxxxxxx
> 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
> <areddy@xxxxxxxxxxxxx>
> 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
>
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