Re: [Gluster-users] gfid generation
On Wed, Nov 16, 2016 at 3:31 AM, Ankireddypalle Reddy 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 > > > > 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 > ***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." > ** > -- Pranith ___ Gluster-users mailing list Gluster-users@gluster.org http://www.gluster.org/mailman/listinfo/gluster-users
Re: [Gluster-users] gfid generation
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 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 > > 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 ***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
Re: [Gluster-users] gfid generation
On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy 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." > ** > -- Pranith ___ Gluster-users mailing list Gluster-users@gluster.org http://www.gluster.org/mailman/listinfo/gluster-users
Re: [Gluster-users] gfid generation
On Tue, Nov 15, 2016 at 11:33 PM, Ankireddypalle Reddy 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 > 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 ___ Gluster-users mailing list Gluster-users@gluster.org http://www.gluster.org/mailman/listinfo/gluster-users
Re: [Gluster-users] gfid generation
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 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." ** ___ Gluster-users mailing list Gluster-users@gluster.org<mailto: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
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 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 ___ Gluster-users mailing list Gluster-users@gluster.org http://www.gluster.org/mailman/listinfo/gluster-users
[Gluster-users] gfid generation
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