[Gluster-devel] Need a way to display and flush gluster cache ?

[Prashanth Pai]

+1 to option (2) which similar to echoing into /proc/sys/vm/drop_caches

 -Prashanth Pai

----- Original Message -----
> From: "Mohammed Rafi K C" <rkavunga at redhat.com>
> To: "gluster-users" <gluster-users at gluster.org>, "Gluster Devel" <gluster-devel at gluster.org>
> Sent: Tuesday, 26 July, 2016 10:44:15 AM
> Subject: [Gluster-devel] Need a way to display and flush gluster cache ?
> 
> Hi,
> 
> Gluster stack has it's own caching mechanism , mostly on client side.
> But there is no concrete method to see how much memory are consuming by
> gluster for caching and if needed there is no way to flush the cache memory.
> 
> So my first question is, Do we require to implement this two features
> for gluster cache?
> 
> 
> If so I would like to discuss some of our thoughts towards it.
> 
> (If you are not interested in implementation discussion, you can skip
> this part :)
> 
> 1) Implement a virtual xattr on root, and on doing setxattr, flush all
> the cache, and for getxattr we can print the aggregated cache size.
> 
> 2) Currently in gluster native client support .meta virtual directory to
> get meta data information as analogues to proc. we can implement a
> virtual file inside the .meta directory to read  the cache size. Also we
> can flush the cache using a special write into the file, (similar to
> echoing into proc file) . This approach may be difficult to implement in
> other clients.
> 
> 3) A cli command to display and flush the data with ip and port as an
> argument. GlusterD need to send the op to client from the connected
> client list. But this approach would be difficult to implement for
> libgfapi based clients. For me, it doesn't seems to be a good option.
> 
> Your suggestions and comments are most welcome.
> 
> Thanks to Talur and Poornima for their suggestions.
> 
> Regards
> 
> Rafi KC
> 
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