On 02/03/2016 07:54 PM, Jeff Darcy wrote:
Problem is with workloads which know the files that need to be read
without readdir, like hyperlinks (webserver), swift objects etc. These
are two I know of which will have this problem, which can't be improved
because we don't have metadata, data co-located. I have been trying to
think of a solution for past few days. Nothing good is coming up :-/
In those cases, caching (at the MDS) would certainly help a lot. Some
variation of the compounding infrastructure under development for Samba
etc. might also apply, since this really is a compound operation.
Even with compound fops It will still require two sequential network
operations from dht2. One to MDC and one to DC So I don't think it helps.
Pranith
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