[Gluster-devel] Feature support: development of metadata service xlator plugin in glusterfs.

[Vijay Bellur]

On Friday 19 June 2015 10:43 PM, 张兵 wrote:
> Hi all
>      In the use of the glusterfs ,found file system commands a lot, such
> as stat, lookup,setfattr, the very influence system performance,
> especially with EC volume. The use of glusterfs code architecture and
> add metadata server xlater and achieve similar GFS architecture; so, the
> same set of software, users can choose their own metadata server or not
> to choose the metadata server;

How do you expect the metadata server to aide performance here? There 
would be network trips to the metadata servers to set/fetch necessary 
information. If the intention is to avoid the penalty of having to fetch 
information from disk, we have been investigating the possibility of 
loading md-cache as part of the brick process graph to avoid hitting the 
disk for repetitive fetch of attributes & extended attributes. I expect 
that to be mainlined soon.

If you have other ideas on how a metadata server can improve 
performance, that would be interesting to know.

Regards,
Vijay