[Gluster-devel] Improvements in Quota Translator

[John Mark Walker]

Thanks, Varun. 

Please also fill out a page on the wiki using this template: http://www.gluster.org/community/documentation/index.php/Features/Feature_Template 

And put the finished page in this directory: http://www.gluster.org/community/documentation/index.php/Features/<ngquota_page> 

Thanks! 

-JM 

----- Original Message -----

> Hi Everyone,

> As gluster quota was facing some issues in its functionality, its required to
> make it fool-proof, robust and reliable. So, below are the some of the major
> problems we are facing and the modifications to overcome the same.

> Current implementation
> * Client side implementation of quota
> - Not secure
> - Increased traffic in updating the ctx
> - Relying on xattrs updation through lookup calls
> * Problem with NFS mount
> - lack of lookups (handling through 'file handles')

> So, the new design is proposed,

> * Two level of quota implementation soft and hard quota, similar to the XFS's
> quota, is introduced.
> A message is logged on reaching soft quota and no more writes allowed after
> hard limit.

> * Quota is moved to server-side.
> Server side implementation removes the client dependability for specific
> calls and secures the quota from mounting with modified volfile.

> To get the cluster view,
> A trusted quota client process will be spawned, on set of random 'n' bricks,
> containing only the cluster xlators, to aggregate the size on all the bricks
> of the volume. By querying for getxattrs on the directories, for a fixed
> time interval (say t secs), it updates the context of the quota xlator in
> server graph, by sending the setxattr with a key in dict. The t depends on
> lists, in the descending order for, 1. below soft limit 2. above soft limit;
> AND it is tunable.

> Thus in the current implementation we'll have 2 quota xlators: one in server
> graph, and one in trusted client of which the sole purpose will be to
> aggregate the quota xattrs on all the bricks and send the same to server
> quota xlator.

> So, please share your opinion/suggestion/concerns about the above draft.

> Thanks-to: Vijay, Amar, Raghavendra & Junaid.

> Regards
> Varun Shastry

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