Re: Feature support: development of metadata service xlator plugin in glusterfs.

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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


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