[Gluster-devel] Upcalls Infrastructure

[Niels de Vos]

On Fri, Dec 12, 2014 at 12:47:21PM +0530, Soumya Koduri wrote:
> Hi,
> 
> This framework has been designed to maintain state in the glusterfsd
> process, for each the files being accessed (including the clients info
> accessing those files) and send notifications to the respective glusterfs
> clients incase of any change in that state.
> 
> Few of the use-cases (currently identified) of this infrastructure are:
> 
> * Inode Update/Invalidation
> 	- clients caching inode entries or attributes of a file (eg., md-cache) can
> make use of this support to update or invalidate those entries based on the
> notifications sent by server of the attributes changed on the corresponding
> files in the back-end.
> 
> * Recall Delegations/lease-locks
> 	- For lease-locks to be supported, the server should be able to maintain
> those locks states and recall them successfully by sending notifications to
> the clients incase of any conflicting access requested by another client.
> 
> * Maintain Share Reservations/Locks states.
> 	- Along with lease-lock states (mentioned above), we could extend this
> framework to support Open Share-reservations/Locks
> 
> In addition to the above, this framework could be extended to add, maintain
> any other file states and send callback events when required.
> 
> Feature page -
> http://www.gluster.org/community/documentation/index.php/Features/Upcall-infrastructure
> 
> PoC on this feature is done. One of the initial consumers of this support is
> NFS-ganesha (a user-mode file server for NFSv3,4.0,4.1,pNFS developed by an
> active open-source community -
> https://github.com/nfs-ganesha/nfs-ganesha/wiki)
> 
> Note: This support will be turned off by default and enabled only if
> required by using a tunable option (currently using Gluster CLI option to
> enable NFS-Ganesha, being developed as part of a different
> feature that will get its Feature Page announced soon)
> 
> Comments and feedback are welcome.

Great! I've just added this to the planning page for 3.7 as you
mentioned on IRC that is the release you target for:
- http://www.gluster.org/community/documentation/index.php/Planning37

Thanks for posting these details,
Niels
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