the osd overload result in mds cannot reply client quickly

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hi,developers
    i mount a new client and create a new directory when the osds are
overload. in gerenal ,mds needs to return a safe
message to the client( not return unsafe message to client at this
time), but in this condition(OSD overloads) ,it takes too long to wait
for OSD finish  OSD_Op ,so the MDS can not immediatly answer the
client the safe message, is there any resolutions about this problem?
if did, in which model should  i  try it ,OSD or MDS?

thanks !
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